Re: [arch-general] Display issues with Linux 3.1
hollun...@lavabit.com, Sun 2011-11-13 @ 13:06:49-0500: > Now we know loads of workarounds but it's still a bug. I'd file it but > it seems https://bugzilla.kernel.org/ is down. Down for you too? Pretty sure kernel.org is still getting services back online after their security breach earlier this year. I wouldn't count on their bug tracker being back up for a while. According to the MAINTAINERS file in the root of the Linux source tree, the mailing list responsible for the development of the Intel DRM driver is intel-...@lists.freedesktop.org. So that's probably the best place to post a bug report. Or you could post in the freedesktop.org Bugzilla. If you do file a bug, post a link to it here if you don't mind; I'd like to follow the thread. pgpt28Be67go1.pgp Description: PGP signature
Re: [arch-general] Display issues with Linux 3.1
> hollunder@... wrote: > >>> hollunder@..., Sat 2011-11-12 @ 22:42:57-0500: >>> [1] https://bugs.freedesktop.org/show_bug.cgi?id=22674#c11 >> >> Thanks Taylor, >> I still consider this a bug because this didn't happen for years but >> seems to happen every time I boot since 3.1. >> >> Another workaround is to disable kms by booting with the nomodeset >> option. >> >> Another new issue is that my mousepointer frequently >> flickers/disappears and that xv video out in smplayer doesn't work >> anymore, but both of those are with the nomodeset option, have yet to >> test with kms enabled again. > > FWIW, KMS never worked for me (on a desktop, though). The board has > a nvidia chipset. All the characters on the screen were displayed > "giant mode", ie. I could see only the first few of them, but they were > inches wide, with large pixels. > > So I had to append "nouveau.modeset=0" to the append line of the > etc/lilo.conf. > > > clemens Back when kms was introduced it was already supported by intel (I guess they developed it) and it took a while for nvidia and ATI. That it causes issues now for intel is clearly a regression, that it still doesn't work for nvidia is ... bad. On the other hand it seems a machine with intel chip doesn't work properly without kms now, so I'm not quite sure what's worse.
Re: [arch-general] Display issues with Linux 3.1
> hollun...@lavabit.com, Sun 2011-11-13 @ 11:18:05-0500: >> Another workaround is to disable kms by booting with the nomodeset >> option. >> >> Another new issue is that my mousepointer frequently >> flickers/disappears and that xv video out in smplayer doesn't work >> anymore, but both of those are with the nomodeset option, have yet to >> test with kms enabled again. > > I was under the impression that KMS was required in order to run modern > versions of X. If that's the case, it's likely that your new issues are > a result of the nomodeset kernel parameter. I'd try reenabling KMS and > adding i915 to the initcpio. That may solve the problem. > > For what it's worth, I'm not seeing the mouse cursor flickering. I don't > use smplayer so I can't speak to that problem. I did test it with i915 added, kernel re-installed and nomodeset removed and stuff seems to be back to normal. xv works again, mouse cursor flicker is gone, so I'm reasonably sure that X on intel chips just doesn't work properly anymore without KMS. The switch to the KMS resolution happens earlier now, but that doesn't hurt. The wiki seems to already contain information about this and it says some stuff about nomodeset being the option for non-intel chipsets only (which is obviously not quite true) and that X doesn't work without kms (which is also plain false). Now we know loads of workarounds but it's still a bug. I'd file it but it seems https://bugzilla.kernel.org/ is down. Down for you too?
Re: [arch-general] Display issues with Linux 3.1
hollun...@lavabit.com, Sun 2011-11-13 @ 11:18:05-0500: > Another workaround is to disable kms by booting with the nomodeset > option. > > Another new issue is that my mousepointer frequently > flickers/disappears and that xv video out in smplayer doesn't work > anymore, but both of those are with the nomodeset option, have yet to > test with kms enabled again. I was under the impression that KMS was required in order to run modern versions of X. If that's the case, it's likely that your new issues are a result of the nomodeset kernel parameter. I'd try reenabling KMS and adding i915 to the initcpio. That may solve the problem. For what it's worth, I'm not seeing the mouse cursor flickering. I don't use smplayer so I can't speak to that problem. pgpGK87z777j4.pgp Description: PGP signature
Re: [arch-general] Display issues with Linux 3.1
hollunder@... wrote: >> hollunder@..., Sat 2011-11-12 @ 22:42:57-0500: >> [1] https://bugs.freedesktop.org/show_bug.cgi?id=22674#c11 > > Thanks Taylor, > I still consider this a bug because this didn't happen for years but > seems to happen every time I boot since 3.1. > > Another workaround is to disable kms by booting with the nomodeset > option. > > Another new issue is that my mousepointer frequently > flickers/disappears and that xv video out in smplayer doesn't work > anymore, but both of those are with the nomodeset option, have yet to > test with kms enabled again. FWIW, KMS never worked for me (on a desktop, though). The board has a nvidia chipset. All the characters on the screen were displayed "giant mode", ie. I could see only the first few of them, but they were inches wide, with large pixels. So I had to append "nouveau.modeset=0" to the append line of the etc/lilo.conf. clemens
Re: [arch-general] Display issues with Linux 3.1
> hollun...@lavabit.com, Sat 2011-11-12 @ 22:42:57-0500: >> I'm rather sure this is a new intel driver bug, I have the exact same >> issue. My laptops chipset is slightly newer: >> 00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 >> Integrated Graphics Controller (primary) (rev 03) >> 00:02.1 Display controller: Intel Corporation Mobile GM965/GL960 >> Integrated Graphics Controller (secondary) (rev 03) > > I finally figured out a fix for the blank screen during boot issue. I > had not added i915 to the MODULES list in my mkinitcpio.conf, because > later in the boot process, udev would kick in and load the driver > automatically. But apparently this can cause a sort of race condition, > where if modules happen to be loaded in a particular order by udev, this > blank screen issue can occur. Loading the driver during early userspace > avoids this problem entirely, since by the time udev starts up, the > module has already been present in the kernel for a while. > > So if you don't already have i915 in MODULES, just add it and then > regenerate your initial ramdisk. This seems to have solved the problem > for me. > > I was inspired by a suggestion [1] in a bug report on freedesktop.org, > which led me to this solution. The bug report is for a similar (but not > identical) issue. The user reported that building a kernel with the i915 > driver statically included made his problem disappear. I tried this, and > it worked. But this has essentially the same effect as including the > module in the initial ramdisk, which is a bit easier to do. So there you > go. > > [1] https://bugs.freedesktop.org/show_bug.cgi?id=22674#c11 Thanks Taylor, I still consider this a bug because this didn't happen for years but seems to happen every time I boot since 3.1. Another workaround is to disable kms by booting with the nomodeset option. Another new issue is that my mousepointer frequently flickers/disappears and that xv video out in smplayer doesn't work anymore, but both of those are with the nomodeset option, have yet to test with kms enabled again.
Re: [arch-general] Display issues with Linux 3.1
hollun...@lavabit.com, Sat 2011-11-12 @ 22:42:57-0500: > I'm rather sure this is a new intel driver bug, I have the exact same > issue. My laptops chipset is slightly newer: > 00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 > Integrated Graphics Controller (primary) (rev 03) > 00:02.1 Display controller: Intel Corporation Mobile GM965/GL960 > Integrated Graphics Controller (secondary) (rev 03) I finally figured out a fix for the blank screen during boot issue. I had not added i915 to the MODULES list in my mkinitcpio.conf, because later in the boot process, udev would kick in and load the driver automatically. But apparently this can cause a sort of race condition, where if modules happen to be loaded in a particular order by udev, this blank screen issue can occur. Loading the driver during early userspace avoids this problem entirely, since by the time udev starts up, the module has already been present in the kernel for a while. So if you don't already have i915 in MODULES, just add it and then regenerate your initial ramdisk. This seems to have solved the problem for me. I was inspired by a suggestion [1] in a bug report on freedesktop.org, which led me to this solution. The bug report is for a similar (but not identical) issue. The user reported that building a kernel with the i915 driver statically included made his problem disappear. I tried this, and it worked. But this has essentially the same effect as including the module in the initial ramdisk, which is a bit easier to do. So there you go. [1] https://bugs.freedesktop.org/show_bug.cgi?id=22674#c11 pgphkSyjUIobu.pgp Description: PGP signature
Re: [arch-general] Display issues with Linux 3.1
> Since updating to Linux 3.1 yesterday, I've been having strange problems > with the display on my laptop. The first reboot after updating the > kernel went normally, but every subsequent boot since then has had > problems. > > This is a Dell Latitude D620 laptop with the following graphics-related > lines in the lspci output: > > 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, > 943/940GML Express Integrated Graphics Controller (rev 03) > 00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, > 943/940GML Express Integrated Graphics Controller (rev 03) > > During boot, at the stage where it says "Waiting for UDev uevents to be > processed", the backlight normally blinks and the display mode changes, > presumably due to udev detecting my graphics hardware. > > Since the kernel update, the backlight still blinks off momentarily, but > when it comes back on, the screen remains blank. Rather than seeing the > rest of the boot messages, the display is just black (but backlit). The > system still seems to boot like normal; I boot to the virtual console > rather than starting X automatically, and once the hard disk activity > stops after booting, I can blindly type my login credentials and issue > shell commands, though I still can't see any output. > > Additionally, after the first reboot following the update (which did not > have the aforementioned display problems), I had issues with the display > backlight after starting X. If I shut the laptop lid, the backlight > usually shuts off, and comes back on when I reopen it. However, after > the kernel update, around 80% of the time, the backlight seemed to come > back on at about a third of its usual brightness. I had to close and > reopen it several times, and eventually it would come on at full power > like normal. > > I managed to boot the system in single-user mode using the fallback > initcpio image (any other combination of boot options seemed to result > in the blank screen), and then downgraded the kernel back to 3.0.7. > After downgrading, all of these problems seem to have disappeared. > > I've scanned through dmesg output and I don't really see anything out of > the ordinary. But I admit that I don't really know what I'm looking for. > Any thoughts or suggestions? I'm rather sure this is a new intel driver bug, I have the exact same issue. My laptops chipset is slightly newer: 00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (primary) (rev 03) 00:02.1 Display controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (secondary) (rev 03) The backlight thing is a completely unrelated issue. I couldn't care less about the backlight when all I get to see is a blank screen. Did someone find/file a bug at kernel.org already?
Re: [arch-general] Display issues with Linux 3.1
Taylor Hedberg, Fri 2011-11-11 @ 10:36:02-0500: > Thanks for these links. I'll test the patch on my system tonight when I > get some free time. Compiling Linux on my laptop takes forever. The patch you linked fixed the dim backlight issue on my system. I'm still experiencing the blank screen issue at boot-time, however, so I guess there are two separate regressions.
Re: [arch-general] Display issues with Linux 3.1
On 2011-11-11 at 10:36 -0500, Taylor Hedberg wrote: > Thanks for these links. I'll test the patch on my system > tonight when I get some free time. Compiling Linux on my > laptop takes forever. There is a commit[1] in linux 3.1.1-1 which sets the right backlight brightness level when the lid is closed and opened again. However `xset dpms force off` still sets the brightness to the lowest level and breaks the brightness buttons. [1]: http://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=commitdiff;h=b9fac9d41ceea38e4f8684281c57a096c6d12e1f
Re: [arch-general] Display issues with Linux 3.1
Uli Armbruster, Fri 2011-11-11 @ 17:14:16+0100: > Ok here on my laptop it's definitely hardware-based, the backlight > doesn't work in the first moment, when the laptop is cold. I just > booted my cold laptop into 3.0.7 linux-rt and it happened there as > well. It seems that we have symptomatically similar but unrelated problems, then. I've only ever seen this problem with 3.1, and never with any earlier kernel.
Re: [arch-general] Display issues with Linux 3.1
* Uli Armbruster [10.11.2011 14:53]: > * Taylor Hedberg [10.11.2011 13:50]: > > Uli Armbruster, Thu 2011-11-10 @ 07:45:11+0100: > > > I can confirm this behavior, however I'm not sure if it's software > > > related. I have the impression that this happens here only if the > > > laptop is cold (e.g. because I carried it around outside in the cold > > > german autumn). But Taylor's describtion fits perfectly to the > > > behavior I have, so maybe it really is caused by the kernel. > > > > > > I have a 01:00.0 VGA compatible controller: ATI Technologies Inc RV350 > > > [Mobility Radeon 9600 M10] and use the radeon driver. > > > > Does the problem disappear if you downgrade the kernel? It certainly > > does for me. That would tell you whether it's hardware or software issue > > on your machine. > > I'll try to look into it. I also have the linux-rt kernel installed, which is > still version 3.0.7. I'll tell you if it happens as well with this kernel. Ok here on my laptop it's definitely hardware-based, the backlight doesn't work in the first moment, when the laptop is cold. I just booted my cold laptop into 3.0.7 linux-rt and it happened there as well.
Re: [arch-general] Display issues with Linux 3.1
Sebastian Schwarz, Fri 2011-11-11 @ 16:26:24+0100: > After running `xbacklight -set 100` my backlight is at the > previous brightness level, which is 57% and not at the 100% > xbacklight should set it to. I see. I usually run my backlight at 100%, so I could be seeing the same thing and not realizing it, as my previous level would be 100% in the usual case. > So 3.1 has probably some new backlight code, which does not > work as it should. And indeed there are two threads on the > linux.kernel newsgroup[1, 2] and one on the LKML[3] with an > explanation, a patch[4] and a couple of bug reports[5, 6, 7]. > > I have not tested the patch yet, but is seems to deal with the > issue at hand. > > [1]: > https://groups.google.com/group/linux.kernel/browse_thread/thread/28296924ee31 > [2]: > https://groups.google.com/group/linux.kernel/browse_thread/thread/fde3079d9ff7b77c > [3]: https://lkml.org/lkml/2011/9/19/381 > [4]: https://lkml.org/lkml/diff/2011/10/25/473/1 > [5]: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/872652 > [6]: https://launchpad.net/~kamalmostafa/+archive/stuck-backlight > [7]: https://bugs.freedesktop.org/show_bug.cgi?id=41926 Thanks for these links. I'll test the patch on my system tonight when I get some free time. Compiling Linux on my laptop takes forever.
Re: [arch-general] Display issues with Linux 3.1
On 2011-11-10 at 19:36 -0500, Taylor Hedberg wrote:
> Sebastian Schwarz, Thu 2011-11-10 @ 16:36:54+0100:
> > The bug can easily triggered in X by running:
> >
> > xset dpms force off
>
> Yes, this is the same behavior that I'm seeing. Writing the
> max_brightness value into the sysfs brightness file restores
> normal backlight brightness. I can also restore it with
> `xbacklight -set 100`.
After running `xbacklight -set 100` my backlight is at the
previous brightness level, which is 57% and not at the 100%
xbacklight should set it to.
> > I found this I my dmesg output:
> >
> > [Firmware Bug]: Duplicate ACPI video bus devices for the same VGA
> > controller, please try module parameter
> > "video.allow_duplicates=1"if the current driver doesn't work.
> >
> > But I also haven't tried this, as the incorrect brightness has not
> > annoyed me enough, yet.
>
> I have this message in my dmesg output as well, but
> unfortunately, setting the mentioned module parameter doesn't
> have any effect on the problems I'm seeing.
It doesn't do anything over here, too. However downgrading the
kernel to 3.0.7-1 helps. There are a few interesting things:
% pacman -Q linux xorg-xbacklight
linux 3.0.7-1
xorg-xbacklight 1.1.2-2
% xbacklight -get
No outputs have backlight property
% cat /sys/class/backlight/intel_backlight/{,max_}brightness
cat: /sys/class/backlight/intel_backlight/brightness: No such file or
directory
cat: /sys/class/backlight/intel_backlight/max_brightness: No such file or
directory
So 3.1 has probably some new backlight code, which does not
work as it should. And indeed there are two threads on the
linux.kernel newsgroup[1, 2] and one on the LKML[3] with an
explanation, a patch[4] and a couple of bug reports[5, 6, 7].
I have not tested the patch yet, but is seems to deal with the
issue at hand.
[1]:
https://groups.google.com/group/linux.kernel/browse_thread/thread/28296924ee31
[2]:
https://groups.google.com/group/linux.kernel/browse_thread/thread/fde3079d9ff7b77c
[3]: https://lkml.org/lkml/2011/9/19/381
[4]: https://lkml.org/lkml/diff/2011/10/25/473/1
[5]: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/872652
[6]: https://launchpad.net/~kamalmostafa/+archive/stuck-backlight
[7]: https://bugs.freedesktop.org/show_bug.cgi?id=41926
Re: [arch-general] Display issues with Linux 3.1
Sebastian Schwarz, Thu 2011-11-10 @ 16:36:54+0100: > My display comes back with the minimal brightness setting. Also the > XF86MonBrightnessUp (Fn+Up) and XF86MonBrightnessDown (Fn+Down) > buttons stopped working. I can restore the previous brightness level > and the buttons by running: > > cat /sys/class/backlight/intel_backlight/max_brightness \ > > /sys/class/backlight/intel_backlight/brightness > > The bug can easily triggered in X by running: > > xset dpms force off Yes, this is the same behavior that I'm seeing. Writing the max_brightness value into the sysfs brightness file restores normal backlight brightness. I can also restore it with `xbacklight -set 100`. > I found this I my dmesg output: > > [Firmware Bug]: Duplicate ACPI video bus devices for the same VGA > controller, please try module parameter > "video.allow_duplicates=1"if the current driver doesn't work. > > But I also haven't tried this, as the incorrect brightness has not > annoyed me enough, yet. I have this message in my dmesg output as well, but unfortunately, setting the mentioned module parameter doesn't have any effect on the problems I'm seeing.
Re: [arch-general] Display issues with Linux 3.1
On (11/09/2011 06:55 PM), Taylor Hedberg wrote: -~> Additionally, after the first reboot following the update (which did not -~> have the aforementioned display problems), I had issues with the display -~> backlight after starting X. Indeed there seems to be a problem with intel graphics. Since 3.1 I get a strange display flicker when calling xbacklight. An older card though: 00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07) -- Leonid Isaev GnuPG key ID: 164B5A6D Key fingerprint: C0DF 20D0 C075 C3F1 E1BE 775A A7AE F6CB 164B 5A6D pgpfVYW8UE6Ex.pgp Description: PGP signature
Re: [arch-general] Display issues with Linux 3.1
On Wed, Nov 09, 2011 at 07:55:22PM -0500, Taylor Hedberg wrote: > Since updating to Linux 3.1 yesterday, I've been having strange problems > with the display on my laptop. The first reboot after updating the > kernel went normally, but every subsequent boot since then has had > problems. > > This is a Dell Latitude D620 laptop with the following graphics-related > lines in the lspci output: > > 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, > 943/940GML Express Integrated Graphics Controller (rev 03) > 00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, > 943/940GML Express Integrated Graphics Controller (rev 03) > > During boot, at the stage where it says "Waiting for UDev uevents to be > processed", the backlight normally blinks and the display mode changes, > presumably due to udev detecting my graphics hardware. > Same problem here, on an Asus laptop with Intel (945GM) graphics. Still fiddling with it, but I can restore proper operation by starting X then (ctl+alt+fn) moving to a tty. I start X by ssh'ing from another machine. I have another machine with intel (945G) graphics that does not have the problem. But it's not a laptop. Next tests are to remove laptop specific daemons from rc.conf to see if that helps (since both these machines are almost identical in configuration). Rgds, -- Mike Bishop Willow, Alaska
Re: [arch-general] Display issues with Linux 3.1
On 11/09/2011 06:55 PM, Taylor Hedberg wrote: Additionally, after the first reboot following the update (which did not have the aforementioned display problems), I had issues with the display backlight after starting X. Just to add to the display discussion... On an x86_64 (with nVidia), after 1st boot, the kdm login screen would not power off (the 10 min. power-off that blanks the display if no login). I've never seen this behavior before, but noticed it ~1 hour after booting as I walked by the box. The login was just a big and bright as could be. I'm fairly particular about checking because I don't want burn-in even though that has largely been eliminated, I still check... -- David C. Rankin, J.D.,P.E.
Re: [arch-general] Display issues with Linux 3.1
Hello, On 2011-11-09 at 19:55 -0500, Taylor Hedberg wrote: > This is a Dell Latitude D620 laptop with the following > graphics-related lines in the lspci output: > > 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, > 943/940GML Express Integrated Graphics Controller (rev 03) > 00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, > 943/940GML Express Integrated Graphics Controller (rev 03) I have a Dell Latitude D420 with the same card. > Since the kernel update, the backlight still blinks off > momentarily, but when it comes back on, the screen remains > blank. Rather than seeing the rest of the boot messages, the > display is just black (but backlit). The system still seems to > boot like normal; I boot to the virtual console rather than > starting X automatically, and once the hard disk activity > stops after booting, I can blindly type my login credentials > and issue shell commands, though I still can't see any output. I do not have this problem, however this sounds familiar: > If I shut the laptop lid, the backlight usually shuts off, > and comes back on when I reopen it. However, after the kernel > update, around 80% of the time, the backlight seemed to come > back on at about a third of its usual brightness. I had to > close and reopen it several times, and eventually it would > come on at full power like normal. My display comes back with the minimal brightness setting. Also the XF86MonBrightnessUp (Fn+Up) and XF86MonBrightnessDown (Fn+Down) buttons stopped working. I can restore the previous brightness level and the buttons by running: cat /sys/class/backlight/intel_backlight/max_brightness \ > /sys/class/backlight/intel_backlight/brightness The bug can easily triggered in X by running: xset dpms force off > After downgrading, all of these problems seem to have > disappeared. I haven't bothered to downgrade the kernel yet. > I've scanned through dmesg output and I don't really see > anything out of the ordinary. But I admit that I don't really > know what I'm looking for. Any thoughts or suggestions? I found this I my dmesg output: [Firmware Bug]: Duplicate ACPI video bus devices for the same VGA controller, please try module parameter "video.allow_duplicates=1"if the current driver doesn't work. But I also haven't tried this, as the incorrect brightness has not annoyed me enough, yet. Regards, Sebastian
Re: [arch-general] Display issues with Linux 3.1
On 10-11-2011 06:45, Uli Armbruster wrote: * Taylor Hedberg [10.11.2011 01:55]: Since updating to Linux 3.1 yesterday, I've been having strange problems with the display on my laptop. The first reboot after updating the kernel went normally, but every subsequent boot since then has had problems. This is a Dell Latitude D620 laptop with the following graphics-related lines in the lspci output: 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03) 00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03) During boot, at the stage where it says "Waiting for UDev uevents to be processed", the backlight normally blinks and the display mode changes, presumably due to udev detecting my graphics hardware. Since the kernel update, the backlight still blinks off momentarily, but when it comes back on, the screen remains blank. Rather than seeing the rest of the boot messages, the display is just black (but backlit). The system still seems to boot like normal; I boot to the virtual console rather than starting X automatically, and once the hard disk activity stops after booting, I can blindly type my login credentials and issue shell commands, though I still can't see any output. Additionally, after the first reboot following the update (which did not have the aforementioned display problems), I had issues with the display backlight after starting X. If I shut the laptop lid, the backlight usually shuts off, and comes back on when I reopen it. However, after the kernel update, around 80% of the time, the backlight seemed to come back on at about a third of its usual brightness. I had to close and reopen it several times, and eventually it would come on at full power like normal. I managed to boot the system in single-user mode using the fallback initcpio image (any other combination of boot options seemed to result in the blank screen), and then downgraded the kernel back to 3.0.7. After downgrading, all of these problems seem to have disappeared. I've scanned through dmesg output and I don't really see anything out of the ordinary. But I admit that I don't really know what I'm looking for. Any thoughts or suggestions? I can confirm this behavior, however I'm not sure if it's software related. I have the impression that this happens here only if the laptop is cold (e.g. because I carried it around outside in the cold german autumn). But Taylor's describtion fits perfectly to the behavior I have, so maybe it really is caused by the kernel. I have a 01:00.0 VGA compatible controller: ATI Technologies Inc RV350 [Mobility Radeon 9600 M10] and use the radeon driver. Works fine for me here after a few reboots/cold boot/hibernate. I'm using the radeon driver with: 01:00.0 VGA compatible controller: ATI Technologies Inc Mobility Radeon HD 2400 -- Mauro Santos
Re: [arch-general] Display issues with Linux 3.1
* Taylor Hedberg [10.11.2011 13:50]: > Uli Armbruster, Thu 2011-11-10 @ 07:45:11+0100: > > I can confirm this behavior, however I'm not sure if it's software > > related. I have the impression that this happens here only if the > > laptop is cold (e.g. because I carried it around outside in the cold > > german autumn). But Taylor's describtion fits perfectly to the > > behavior I have, so maybe it really is caused by the kernel. > > > > I have a 01:00.0 VGA compatible controller: ATI Technologies Inc RV350 > > [Mobility Radeon 9600 M10] and use the radeon driver. > > Does the problem disappear if you downgrade the kernel? It certainly > does for me. That would tell you whether it's hardware or software issue > on your machine. I'll try to look into it. I also have the linux-rt kernel installed, which is still version 3.0.7. I'll tell you if it happens as well with this kernel.
Re: [arch-general] Display issues with Linux 3.1
Uli Armbruster, Thu 2011-11-10 @ 07:45:11+0100: > I can confirm this behavior, however I'm not sure if it's software > related. I have the impression that this happens here only if the > laptop is cold (e.g. because I carried it around outside in the cold > german autumn). But Taylor's describtion fits perfectly to the > behavior I have, so maybe it really is caused by the kernel. > > I have a 01:00.0 VGA compatible controller: ATI Technologies Inc RV350 > [Mobility Radeon 9600 M10] and use the radeon driver. Does the problem disappear if you downgrade the kernel? It certainly does for me. That would tell you whether it's hardware or software issue on your machine.
Re: [arch-general] Display issues with Linux 3.1
Have you tried playing with KMS, see if it changes anything enabling or disabling it? -- Cédric Girard
Re: [arch-general] Display issues with Linux 3.1
Am 10.11.2011 07:45, schrieb Uli Armbruster: > * Taylor Hedberg [10.11.2011 01:55]: >> 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, >> 943/940GML Express Integrated Graphics Controller (rev 03) >> 00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, >> 943/940GML Express Integrated Graphics Controller (rev 03) > I have a > 01:00.0 VGA compatible controller: ATI Technologies Inc RV350 [Mobility > Radeon 9600 M10] > and use the radeon driver. Those are completely different chips and different drivers, I would be surprised to see any connection here. I'm afraid I can't tell you anything about this problem, besides the usual "works fine for me" answer, at least in the case of the 'intel' driver. 00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 12) signature.asc Description: OpenPGP digital signature
Re: [arch-general] Display issues with Linux 3.1
* Taylor Hedberg [10.11.2011 01:55]: > Since updating to Linux 3.1 yesterday, I've been having strange problems > with the display on my laptop. The first reboot after updating the > kernel went normally, but every subsequent boot since then has had > problems. > > This is a Dell Latitude D620 laptop with the following graphics-related > lines in the lspci output: > > 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, > 943/940GML Express Integrated Graphics Controller (rev 03) > 00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, > 943/940GML Express Integrated Graphics Controller (rev 03) > > During boot, at the stage where it says "Waiting for UDev uevents to be > processed", the backlight normally blinks and the display mode changes, > presumably due to udev detecting my graphics hardware. > > Since the kernel update, the backlight still blinks off momentarily, but > when it comes back on, the screen remains blank. Rather than seeing the > rest of the boot messages, the display is just black (but backlit). The > system still seems to boot like normal; I boot to the virtual console > rather than starting X automatically, and once the hard disk activity > stops after booting, I can blindly type my login credentials and issue > shell commands, though I still can't see any output. > > Additionally, after the first reboot following the update (which did not > have the aforementioned display problems), I had issues with the display > backlight after starting X. If I shut the laptop lid, the backlight > usually shuts off, and comes back on when I reopen it. However, after > the kernel update, around 80% of the time, the backlight seemed to come > back on at about a third of its usual brightness. I had to close and > reopen it several times, and eventually it would come on at full power > like normal. > > I managed to boot the system in single-user mode using the fallback > initcpio image (any other combination of boot options seemed to result > in the blank screen), and then downgraded the kernel back to 3.0.7. > After downgrading, all of these problems seem to have disappeared. > > I've scanned through dmesg output and I don't really see anything out of > the ordinary. But I admit that I don't really know what I'm looking for. > Any thoughts or suggestions? I can confirm this behavior, however I'm not sure if it's software related. I have the impression that this happens here only if the laptop is cold (e.g. because I carried it around outside in the cold german autumn). But Taylor's describtion fits perfectly to the behavior I have, so maybe it really is caused by the kernel. I have a 01:00.0 VGA compatible controller: ATI Technologies Inc RV350 [Mobility Radeon 9600 M10] and use the radeon driver.
