[Bug 910536] Re: Screen too dark, no backlight, unusable X
*** This bug is a duplicate of bug 765438 *** https://bugs.launchpad.net/bugs/765438 This is actually a duplicate of the rather old bug 765438. Marking as such. ** This bug has been marked a duplicate of bug 765438 On startup, the backlight is off on laptop -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/910536 Title: Screen too dark, no backlight, unusable X To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/910536/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 910536] Re: Screen too dark, no backlight, unusable X
Thank you for taking the time to file a bug report on this issue. However, given the number of bugs that the Kernel Team receives during any development cycle it is impossible for us to review them all. Therefore, we occasionally resort to using automated bots to request further testing. This is such a request. We have noted that there is a newer version of the development kernel than the one you last tested when this issue was found. Please test again with the newer kernel and indicate in the bug if this issue still exists or not. You can update to the latest development kernel by simply running the following commands in a terminal window: sudo apt-get update sudo apt-get dist-upgrade If the bug still exists, change the bug status from Incomplete to Confirmed. If the bug no longer exists, change the bug status from Incomplete to Fix Released. If you want this bot to quit automatically requesting kernel tests, add a tag named: bot-stop-nagging. Thank you for your help, we really do appreciate it. ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete ** Tags added: kernel-request-3.2.0-21.34 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/910536 Title: Screen too dark, no backlight, unusable X To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/910536/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 910536] Re: Screen too dark, no backlight, unusable X
** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/910536 Title: Screen too dark, no backlight, unusable X To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/910536/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 910536] Re: Screen too dark, no backlight, unusable X
@brad-figg: I did the tests you asked me. I now ran dist-upgrade and booted with the Acer laptop that suffers from this issue. It turned out the old workaround in comment #4 stopped working in the new kernel 3.2.0-18, that is in /etc/default/grub line GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor" I tried replacing it with GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=" and GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux" The second one was not good, as the Fn+Arrow right increased the backlight and Arrow left vice versa, but on this keyboard the buttons should go the other way around. However the former option responded to the buttons the right way. So if you are running a similar Acer laptop, this my recommended solution to get the Fn-buttons working is adding the line GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=" to your /etc/default/grub and then run "sudo update-grub" This is however only 50 % of the solution. When the computer starts you probably want to see the screen by default without pressing Fn+Arrow left first. Therefore add to you /etc/rc.local file the line echo "1" > /sys/class/backlight/intel_backlight/brightness (put it just above the exit 0 line) The workaround in Comment #33 for bug #826386 suggets adding to rc.local the line "sudo setpci -s 00:02.0 F4.B=0", but I think my version is more verbose and robust to errors. Somebody with the skills should write a patch that detects this laptop make and inserts these two lines in grub and rc.local that fixes the issue. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/910536 Title: Screen too dark, no backlight, unusable X To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/910536/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 910536] Re: Screen too dark, no backlight, unusable X
@sma, One bug per bug report. Please file a new bug on the hibernate issue. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/910536 Title: Screen too dark, no backlight, unusable X To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/910536/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 910536] Re: Screen too dark, no backlight, unusable X
An additional problem is, when the computer wakes up after hibernate/standby, the screen will stay black. I found three workarounds, that promise to solve this problem: 1) http://ubuntuforums.org/showthread.php?p=11423423#post11423423 2) http://ubuntuforums.org/showpost.php?p=11578848&postcount=4 3) http://linux-on-acer-aspire-5732z.blogspot.com/2011/06/backlight- workaround-for-linux-mint-11.html (P.S: Same issue also discussed in this thread: https://bugs.launchpad.net/unity/+bug/744187 ) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/910536 Title: Screen too dark, no backlight, unusable X To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/910536/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 910536] Re: Screen too dark, no backlight, unusable X
@bradd, The laptop in question is not my own, so I'm not sure when I'll be able to visit it and test the other workarounds (#5 and #8). The workaround in #4 has been working, so from this particular users point of view the situation is not critical. But eventually I'll test the other workarounds too, so you'll have more data on what are the options to fix this bug. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/910536 Title: Screen too dark, no backlight, unusable X To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/910536/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 910536] Re: Screen too dark, no backlight, unusable X
@otto, Can you take a look at the suggestion in #8 and see if that workaround does indeed help? ** Changed in: linux (Ubuntu) Importance: Undecided => High -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/910536 Title: Screen too dark, no backlight, unusable X To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/910536/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 910536] Re: Screen too dark, no backlight, unusable X
I guess this bug is the same issue as discussed in this bugreport: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/826386 (No backlight display Acer Aspire 5734Z). Maybe the workaround described in #33 (https://bugs.launchpad.net/ubuntu/+source/linux/+bug/826386/comments/33) still works. See also http://ubuntuforums.org/showpost.php?p=10740136&postcount=3 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/910536 Title: Screen too dark, no backlight, unusable X To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/910536/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 910536] Re: Screen too dark, no backlight, unusable X
Thank you for taking the time to file a bug report on this issue. However, given the number of bugs that the Kernel Team receives during any development cycle it is impossible for us to review them all. Therefore, we occasionally resort to using automated bots to request further testing. This is such a request. We have noted that there is a newer version of the development kernel than the one you last tested when this issue was found. Please test again with the newer kernel and indicate in the bug if this issue still exists or not. You can update to the latest development kernel by simply running the following commands in a terminal window: sudo apt-get update sudo apt-get upgrade If the bug still exists, change the bug status from Incomplete to Confirmed. If the bug no longer exists, change the bug status from Incomplete to Fix Released. If you want this bot to quit automatically requesting kernel tests, add a tag named: bot-stop-nagging. Thank you for your help, we really do appreciate it. ** Changed in: linux (Ubuntu) Status: New => Confirmed ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete ** Tags added: kernel-request-3.2.0-7.13 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/910536 Title: Screen too dark, no backlight, unusable X To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/910536/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 910536] Re: Screen too dark, no backlight, unusable X
Likely to be either kernel or perhaps gnome-power-manager. ** Package changed: xorg (Ubuntu) => linux (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/910536 Title: Screen too dark, no backlight, unusable X To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/910536/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 910536] Re: Screen too dark, no backlight, unusable X
I have acer aspire 5734z with gma 4500 running archlinux. best solution for me is adding GRUB_CMDLINE_LINUX="acpi_osi=Linux" to /etc/default/grub then update grub. still starts dark but brightness keys work. it is kernel issue not the operating system. See here https://lkml.org/lkml/2011/4/5/172 I think "acpi_osi=" works also -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/910536 Title: Screen too dark, no backlight, unusable X To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/910536/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 910536] Re: Screen too dark, no backlight, unusable X
I now also got the Fn+Arrow-buttons working by adding the kernel option "acpi_backlight=vendor" if found while googling around. Make change permament by editing row in /etc/default/grub GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor" and then run "sudo update-grub" -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/910536 Title: Screen too dark, no backlight, unusable X To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/910536/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 910536] Re: Screen too dark, no backlight, unusable X
I added now an external monitor to the laptop so that I could investigate what state its is in when booted withouth "acpi=off". It turns out that with ACPI enabled, the xrandr brightness range is 0-9: $ xrandr --prop Screen 0: minimum 320 x 200, current 1024 x 768, maximum 8192 x 8192 LVDS1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 344mm x 193mm EDID: 00000daf9915 07140103802213780a3d9594564f8e28 2650540001010101010101010101 0101010101017a1d56d250001e303c28 360058c1101800fe004e3135 3642332d4c30420a202000fe0043 4d4f0a20202020202020202000fe 004e31353642332d4c30420a20200048 BACKLIGHT: 9 (0x0009) range: (0,9) Backlight: 9 (0x0009) range: (0,9) However the commands dont make any difference, as brightness does not change (screen stays almost black): $ xrandr --output LVDS1 --set BACKLIGHT 0 $ xrandr --output LVDS1 --set BACKLIGHT 5 $ xrandr --output LVDS1 --set BACKLIGHT 9 lsmod shows that the module "acer_wmi" is loaded. Unloading it does not make a difference. All hotkeys seem to work all the time. The page http://www.mjmwired.net/kernel/Documentation/laptops/acer-wmi.txt says there should be a directory /sys/devices/platform/acer-wmi/backlight/acer-wmi/, but that does not exist on this machine: /sys/devices/platform/acer-wmi$ ls driver interface modalias power rfkill subsystem uevent Playing around a little bit I noticed that in sudo -s echo "1" > /sys/class/backlight/intel_backlight/brightness # makes the screen bright echo "2948310" > /sys/class/backlight/intel_backlight/brightness # makes the screen dark I added the first line to /etc/rc.local and this works as a temporary fix. The Fn+Arrow buttons however do not change the brightness. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/910536 Title: Screen too dark, no backlight, unusable X To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/910536/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 910536] Re: Screen too dark, no backlight, unusable X
I noticed that running manually xrandr --output LVDS1 --set BACKLIGHT 0 makes the screen brightness maximum. If I boot without acpi=off and run the xrandr-command, nothing happends. None of the Fn-key work either as acpi is on, so I guess the ACPI is broken. To make the screen as dim as possible, run xrandr --output LVDS1 --set BACKLIGHT 2948310 Maybe the range should be the other way around, 0 as minimum lightness? $ xrandr --prop Screen 0: minimum 320 x 200, current 1366 x 768, maximum 8192 x 8192 LVDS1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 344mm x 193mm EDID: 00000daf9915 07140103802213780a3d9594564f8e28 2650540001010101010101010101 0101010101017a1d56d250001e303c28 360058c1101800fe004e3135 3642332d4c30420a202000fe0043 4d4f0a20202020202020202000fe 004e31353642332d4c30420a20200048 BACKLIGHT: 1 (0x0001) range: (0,2948310) Backlight: 1 (0x0001) range: (0,2948310) scaling mode: Full aspect supported: None Full Center Full aspect 1366x768 60.0*+ 1360x768 59.8 60.0 1024x768 60.0 800x60060.3 56.2 640x48059.9 As a workaround I tried to add xrandr --output LVDS1 --set BACKLIGHT 0 -display :0 to /etc/rc.local but it does not work (error says cookie mismatch). A less optimal workaround I added the command to the Gnome session, but LDM starts out dimmed, so the sole user of the laptop has to enter their password blindly (screen is to dark to see almost anything). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/910536 Title: Screen too dark, no backlight, unusable X To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/910536/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 910536] Re: Screen too dark, no backlight, unusable X
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/910536 Title: Screen too dark, no backlight, unusable X To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/910536/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
