*** This bug is a duplicate of bug 1554613 ***
https://bugs.launchpad.net/bugs/1554613
As comment #117 suggests, disabling tlp fixes it for my Broadwell
Celeron laptop. However, another way to fix it (at least for some of us)
is to set ALPM to a higher power state, which means you can keep
*** This bug is a duplicate of bug 1554613 ***
https://bugs.launchpad.net/bugs/1554613
It happens for me with kernel 4.8.0-34-generic #36~16.04.1-Ubuntu .
with xorg.conf from comment #129.
The flashs start to appear once there is the message pointed in #130, i.e.:
*** This bug is a duplicate of bug 1554613 ***
https://bugs.launchpad.net/bugs/1554613
I've a MacBook Pro, 4k Monitor from Samsung and the error / flickering
occurs with the latest nightly build:
[ 4921.690599] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe B FIFO underrun
*** This bug is a duplicate of bug 1554613 ***
https://bugs.launchpad.net/bugs/1554613
@John Smith: I have two older laptops with Intel chips, one Westmere and
one Ivy Bridge architecture. Only one solution fixed the screen flickers
on both laptop, installing the drm-intel-nightly kernel:
*** This bug is a duplicate of bug 1554613 ***
https://bugs.launchpad.net/bugs/1554613
I'm having this same issue on a Dell 7537 running Ubuntu 16.10 (kernel
4.8).
The flickering that occurs is a rapid change in the brightness of the screen,
in a random, persistently manner (it never
*** This bug is a duplicate of bug 1554613 ***
https://bugs.launchpad.net/bugs/1554613
Update: Now this bug is fixed for me in http://kernel.ubuntu.com
/~kernel-ppa/mainline/v4.4.9-xenial/ as well.
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*** This bug is a duplicate of bug 1554613 ***
https://bugs.launchpad.net/bugs/1554613
** This bug has been marked a duplicate of bug 1554613
screen flickering on XPS13 9350/9550
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I am affected by this bug on dell xps 13 9350 both on FHD and QHD.
Running kernel 4.6rc5 from http://kernel.ubuntu.com/~kernel-
ppa/mainline/v4.6-rc5-wily/ helps as a work-around.
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There's one thing I still don't understand... the root of the problem
was identified in https://bugs.freedesktop.org/show_bug.cgi?id=91393#c25
why hasn't an option to disable the introduced feature been introduced
so far? Or even more, why not reverting completely? The introduced
feature does
** Attachment added: "i915_opregion"
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1522922/+attachment/4649569/+files/opregion2
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Simple question for anyone.
What step would you have to do to apply these patch
https://patchwork.freedesktop.org/patch/69394/
https://patchwork.freedesktop.org/patch/69395/
https://patchwork.freedesktop.org/patch/69396/
https://patchwork.freedesktop.org/patch/82206/
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Everyone hitting the issue, please attach
/sys/kernel/debug/dri/0/i915_vbt (or if that doesn't exist,
i915_opregion).
Mika, just an idea... please check the vswing/pre-emph values in VBT.
I'm not sure if we parse them in either the driver or intel_bios_reader.
Check the VBT spec. Perhaps the VBT
(In reply to alex from comment #112)
> (In reply to Mika Kahola from comment #110)
> > (In reply to alex from comment #109)
> > > Dammit. Now this regression has made it into the LTS kernel. Are you
> > > guys
> > > kidding me? Is it not possible for the changes that caused this
> > >
(In reply to Mika Kahola from comment #110)
> (In reply to alex from comment #109)
> > Dammit. Now this regression has made it into the LTS kernel. Are you guys
> > kidding me? Is it not possible for the changes that caused this
> > exceptionally annoying regression (as in my computer is now
Created attachment 123264
systemd logs with drm.debug=0x1e for stock 4.5.1 kernel (arch) with flicker
after standby
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(In reply to alex from comment #109)
> Dammit. Now this regression has made it into the LTS kernel. Are you guys
> kidding me? Is it not possible for the changes that caused this
> exceptionally annoying regression (as in my computer is now almost entirely
> unusable) to be removed from the
I found something interesting that may or may not be valuable. From what
I can gather so far, we're dealing with two flicker issues. One affects
only Ubuntu MATE, the other affects regular Ubuntu as well. For me, I've
been able to work around the problem in Ubuntu MATE by disabling
tlp.service and
Dammit. Now this regression has made it into the LTS kernel. Are you
guys kidding me? Is it not possible for the changes that caused this
exceptionally annoying regression (as in my computer is now almost
entirely unusable) to be removed from the current production kernel,
pending a proper
*** Bug 94593 has been marked as a duplicate of this bug. ***
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Title:
Screen flickering in Intel i915 driver
To manage
(In reply to Pavel Procopiuc from comment #105)
> (In reply to nhellwege from comment #103)
> > On top of drm-intel-nightly or Ubuntu-4.4.0-18?
>
> Can't really say anything about 4.4, I successfully applied them on top of
> 4.5, 4.6 and drm-nightly when I was checking them.
So I applied all
** Bug watch added: freedesktop.org Bugzilla #94479
https://bugs.freedesktop.org/show_bug.cgi?id=94479
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Title:
(In reply to Pavel Procopiuc from comment #102)
> (In reply to nhellwege from comment #101)
> > I am a bit lost in all these comments, could someone tell me what patch I
> > can try to see if one of your patches has affect on my setup?
>
> These 4:
>
(In reply to nhellwege from comment #101)
> I am a bit lost in all these comments, could someone tell me what patch I
> can try to see if one of your patches has affect on my setup?
These 4:
https://patchwork.freedesktop.org/patch/69394/
https://patchwork.freedesktop.org/patch/69395/
(In reply to nhellwege from comment #103)
> On top of drm-intel-nightly or Ubuntu-4.4.0-18?
Can't really say anything about 4.4, I successfully applied them on top
of 4.5, 4.6 and drm-nightly when I was checking them.
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(In reply to nhellwege from comment #103)
> (In reply to Pavel Procopiuc from comment #102)
> > (In reply to nhellwege from comment #101)
> > > I am a bit lost in all these comments, could someone tell me what patch I
> > > can try to see if one of your patches has affect on my setup?
> >
> >
(In reply to Mika Kahola from comment #100)
> (In reply to Timo Aaltonen from comment #99)
> > Has the latest patch even been sent to the list? At least I can't find it.
>
> Indeed, the patch wasn't on the list. Now you can review it from
>
> https://patchwork.freedesktop.org/patch/82206/
>
>
** Bug watch added: freedesktop.org Bugzilla #94593
https://bugs.freedesktop.org/show_bug.cgi?id=94593
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Title:
I am on a Dell XPS 13 9350 FullHD and I do have the Flicker under Kernel
4.4.0-18 on Ubuntu 16.04 LTS.
I am a bit lost in all these comments, could someone tell me what patch
I can try to see if one of your patches has affect on my setup?
There is also a Bug report related to this one over
(In reply to Timo Aaltonen from comment #99)
> Has the latest patch even been sent to the list? At least I can't find it.
Indeed, the patch wasn't on the list. Now you can review it from
https://patchwork.freedesktop.org/patch/82206/
However, it seems that there are HW's out there that still
Has the latest patch even been sent to the list? At least I can't find
it.
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Title:
Screen flickering in Intel i915
So, eight months since this has been reported and you guys can't even be
bothered to at least revert the changes that caused this originally?
The normal kernel is completely unusable on my machine due to this issue
(Dell XPS 15 (9530)) so I have been forced to run the LTS kernel for the
past
That sounds much more like the issue I'm seeing, which I raised against
Ubuntu Mate (1558736) as it seems to only affect that DE with the 16.04
Beta builds. Both Alphas were fine and other DEs with the same nightlies
were fine. However, that bug was marked as a duplicate of this one,
though I'm
(In reply to thoehlig from comment #95)
> Are these patches in latest-drm-nightly already?
Not yet. These patches needs to be reviewed first.
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Still having the issue of flickering on my HSW eDP with drm-intel-
nightly + v6 patchset + Cache DP signal levels.
Then again my flickering is different and likely a different issue. It's
black flashes of the entire screen, for about the same duration yet at
seemingly random intervals (incl. when
(In reply to Mika Kahola from comment #93)
> Great that the patches worked out for you. I guess its time to upstream
> these patches.
It would be great if you could upstream it before Ubuntu Xenial is
released.
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Are these patches in latest-drm-nightly already?
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Title:
Screen flickering in Intel i915 driver
To manage
Great that the patches worked out for you. I guess its time to upstream
these patches.
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Title:
Screen flickering in
Created attachment 122497
Cache DP signal levels
In your case, when DP link is retrained with the settings from previous
link training the clock recovery fails. This leads into a situation
where link training is started from scratch. However, now the clock
recovery seems to be happy with the
I was applying patches against 6f78897 of drm-intel. All 4 patches also
apply against vanilla 4.5.0 also fixing the issue.
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Created attachment 122517
dmesg after 0004-drm-i915-Cache-DisplayPort-link-signal-levels.patch
It works, I'm not seeing any flicker or repainting issues anymore. Thank
you! I'm still attaching the dmesg. This one covers messages from the
boot until about 30 seconds after DPMS.
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(In reply to Pavel Procopiuc from comment #86)
> Created attachment 122363 [details]
> dmesg-intel-nightly-patches
>
> Here it is, it's from drm-intel kernel on commit 9f8709f + 3 patches you
> provided. I took a dmesg right after boot (while there was no flickering)
> and then did "xset dpms
Created attachment 122338
no-flicker-after-dpms-4.5.patch
Kernel 4.5.0 still has this bug for me. I managed to narrow down the
patch to remedy the flickering to just one hunk though.
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I tried them way back in January with no visible difference, flickering
still appears after laptop panel turns off and back on.
Regarding dmesg, can you please tell me for which kernel you want to see
it (intel-drm-next/vanilla), with those patches or without and which
additional kernel debugging
Started a few weeks ago to get this with my HSW 4200U laptop. Dunno the
exact date, but I've been using drm-intel-nightly all the time, so
presumably since PSR was default enabled.
/sys/kernel/debug/dri/0/i915_edp_psr_status
Sink_Support: yes
Source_OK: yes
Enabled: yes
Active: yes
Busy
Created attachment 122406
dmesg-after-flicker
Here are the two dmesg dumps, same kernel, same patches, but with the
options you mentioned. They are different this time.
One thing I also noticed is that there is not only flicker, but
sometimes old screen content is used for a moment. Like in
(In reply to Pavel Procopiuc from comment #84)
> I tried them way back in January with no visible difference, flickering
> still appears after laptop panel turns off and back on.
>
> Regarding dmesg, can you please tell me for which kernel you want to see it
> (intel-drm-next/vanilla), with those
Created attachment 122405
dmesg-before-flicker
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Title:
Screen flickering in Intel i915 driver
To manage notifications
Created attachment 122363
dmesg-intel-nightly-patches
Here it is, it's from drm-intel kernel on commit 9f8709f + 3 patches you
provided. I took a dmesg right after boot (while there was no
flickering) and then did "xset dpms force off", panel turned off, I
waited for a couple of seconds, did some
(In reply to Pavel Procopiuc from comment #82)
> Created attachment 122338 [details] [review]
> no-flicker-after-dpms-4.5.patch
>
> Kernel 4.5.0 still has this bug for me. I managed to narrow down the patch
> to remedy the flickering to just one hunk though.
Did you try these patches?
Hi Mika
Yes, applying patch 66697 against the latest intel-drm-nightly does
still resolve the issue.
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Title:
Screen
I tested ubuntu Xenial beta, which has the following kernel
Linux ubuntu 4.4.0-9-generic #24-Ubuntu SMP Mon Feb 29 19:33:19 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux
The bug is still there...
it happens not only if you decrease the resolution, but also with the
higher resolution after resuming
It seems that we have something else causing a regression than this link
training optimization feature. Any chance to do bisecting with patch
66697 applied?
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Created attachment 121148
In my case it crashes the PC. Got a kdump.
see also https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1535048
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I reinstalled Ubuntu 15.10 from a DVD iso. Problem fixed.
Linux toshibaS75 4.2.0-27-generic #32-Ubuntu SMP Fri Jan 22 04:49:08 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux
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Also reported in
(https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922).
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Title:
Screen flickering in Intel
(In reply to jlrivitti from comment #78)
> I reinstalled Ubuntu 15.10 from a DVD iso. Problem fixed.
> Linux toshibaS75 4.2.0-27-generic #32-Ubuntu SMP Fri Jan 22 04:49:08 UTC
> 2016 x86_64 x86_64 x86_64 GNU/Linux
I've just tried 4.2.0-27-generic and the flickering is still there
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(In reply to Tom Furniss from comment #72)
> Hi Mika
>
> Yes, applying patch 66697 against the latest intel-drm-nightly does still
> resolve the issue.
Actually, within 10 seconds of posting that message the flickering
started again, and has continued through multiple reboots. So I think I
can
I have a similar problem since 2014.
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1271704
Toshiba Satellite S75-A7334, i7-4700MQ.
*-display
descrição: VGA compatible controller
produto: 4th Gen Core Processor Integrated Graphics Controller
fabricante: Intel
This bugs affects my m3800 on Ubuntu 15.10 with Unity desktop. Flickering seen
with linux kernel 4.2, 4.3 and 4.4.
No flickering only when I run kernel 3.19
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In http://www.lorenzobettini.it/2015/12/flickering-for-intel-graphic-
card-in-linux-4-2/ I described the steps to revert the two commits that
seem to have introduced the flickering. This requires downloading the
kernel sources, revert the two commits, compile the kernel and install
the locally
** Package changed: libdrm (Ubuntu) => xserver-xorg-video-intel (Ubuntu)
** Changed in: xserver-xorg-video-intel (Ubuntu)
Importance: Critical => High
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Finally got the dump just as the monitor started to flicker.
** Attachment added: "crash-kdump.tar.gz"
https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/+attachment/4553076/+files/crash-kdump.tar.gz
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** Changed in: libdrm (Ubuntu)
Status: Confirmed => Triaged
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Title:
Screen flickering in Intel i915 driver
To manage
Created attachment 120919
syslog for 3 patches with increased debug
Hi Mika
No problem. I applied the following patches to the latest drm-intel-nightly:
https://patchwork.freedesktop.org/patch/69394/
https://patchwork.freedesktop.org/patch/69395/
https://patchwork.freedesktop.org/patch/69396/
(In reply to Tom Furniss from comment #69)
> Created attachment 120919 [details]
> syslog for 3 patches with increased debug
>
> Hi Mika
>
> No problem. I applied the following patches to the latest drm-intel-nightly:
> https://patchwork.freedesktop.org/patch/69394/
>
Created attachment 120920
dmesg for 3 patches with increased debug
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Title:
Screen flickering in Intel i915 driver
To manage
Created attachment 120819
dmesg after three patches and returned flicker
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Title:
Screen flickering in Intel i915 driver
To manage
> think Mika is on the right track, having solved the initial problem
> (persistent flickering) by modifying the eDP link training. The remaining
> problem is that the flickering recurs when the display resumes from sleep.
in my case flickering occur just after reboot (and this is not the same
Seeing the video again and based on recent issues I faced I believe this could
be watermark related...
So, could you please apply http://patchwork.freedesktop.org/patch/69417/
and boot with i915.enable_watermark=0 and let us know what happens?
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> https://patchwork.freedesktop.org/patch/69394/
> https://patchwork.freedesktop.org/patch/69395/
> https://patchwork.freedesktop.org/patch/69396/
>
> flux242 seems to have a clock recovery issue. This fix may provide a
> solution for that as well.
three patches above (without the
Created attachment 120818
syslog after three patches and returned flicker
Hi Mika.
I seem to have regressed, and the flicker has returned. I took a new
branch of intel-drm-nightly, and applied the three patches in the
sequence you provided, but the flickering has returned and is consistent
on
Created attachment 120893
DP debugging
Tom, I would bother you again to provide some debugging info. From the
dmesg you sent it seems that you are experiencing a lot of hpd
interrupts. When that happens the driver checks if the DP channel
equalization is still ok. On your case, channel
(In reply to Rodrigo Vivi from comment #65)
> Seeing the video again and based on recent issues I faced I believe this
> could be watermark related...
> So, could you please apply http://patchwork.freedesktop.org/patch/69417/
> and boot with i915.enable_watermark=0 and let us know what happens?
Thank you Tom for the syslog. From the log the DP link training is
completed but for some reason the DP channel equalization fails. At this
point we request to do link training once again and now first we try
first the drive current and pre-emphasis levels from the previous link
training. Instead
patch https://patchwork.freedesktop.org/patch/66697/ DOESN'T solve the
flickering problem on my computer.
What I did:
1. installed generic kernel and headers from
http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-nightly/2015-12-24-wily/
2. get the sources from the
Created attachment 120678
syslog for sleep/resume flickering issue
Mika - this is the syslog for the flickering on resume from sleep, after
applying your latest patch
(https://bugs.freedesktop.org/attachment.cgi?id=120493)
I do fairly consistently see a single flicker after requesting sleep,
and
(In reply to Mika Kahola from comment #54)
> These patches apply to drm-intel-nightly kernel which is a development tree
> for i915 driver. You can clone the git repository from
>
> https://01.org/linuxgraphics/documentation/development/source-code
>
> and apply these patches on top of it. I'm
Created attachment 120493
Disable fast link training when resuming
Tom - thank you for you feedback and logs. I think I need to disable the
fast link training feature when resuming from the suspend state. This
patch does just that in case of DP or eDP connectors. Please, test this
patch if this
(In reply to Mika Kahola from comment #55)
> Created attachment 120493 [details] [review]
> Disable fast link training when resuming
>
> Tom - thank you for you feedback and logs. I think I need to disable the
> fast link training feature when resuming from the suspend state. This patch
> does
> Cloning the 1Gigabyte git repo like you suggest would also mean that I'd
> need to compile drm driver code with the kernel version that in that repo
> too right? Or I can copy the gpu/drm/i915 over to my kernel version and
> it'll work?
Yes, you must rebuild kernel with updated drm driver and
(In reply to Andrew Merzlyakov from comment #52)
> I've experienced exactly the same problem, as Tom Furniss described.
> Kernel version: 4.2.6-301.fc23.x86_64
> dmesg with drm.debug=14 attached.
> I'm failed to apply patches, files structure in drivers/gpu/drm/i915/ is
> slightly different.
> If
Created attachment 120481
dmesg for resume from sleep flickering
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Title:
Screen flickering in Intel i915 driver
To manage notifications
Created attachment 120485
dmesg with drm.debug=14
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Title:
Screen flickering in Intel i915 driver
To manage notifications about this bug
Launchpad has imported 49 comments from the remote bug at
https://bugs.freedesktop.org/show_bug.cgi?id=91393.
If you reply to an imported comment from within Launchpad, your comment
will be sent to the remote bug automatically. Read more about
Launchpad's inter-bugtracker facilities at
** Also affects: libdrm (Ubuntu)
Importance: Undecided
Status: New
** Bug watch added: freedesktop.org Bugzilla #91393
https://bugs.freedesktop.org/show_bug.cgi?id=91393
** Also affects: nouveau via
https://bugs.freedesktop.org/show_bug.cgi?id=91393
Importance: Unknown
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