Debian Gnome Flickers

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Debian Gnome Flickers

Postby GonzaloP » 2018-01-05 05:12

Hi,

For the last couple of weeks I have been experiencing a flickering in the screen, I checked the logs and I am getting:

Code: Select all
[drm:gen8_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun


I am running Debian 9 and the VGA is VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09)

Looking for a solution I found that it seems to be a common problem related to the "AccelMethod" parameter.

How can I change the "AccelMethod" I couldn't find the configuration file.

Thanks
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Re: Debian Gnome Flickers

Postby Head_on_a_Stick » 2018-01-05 06:32

GonzaloP wrote:
Code: Select all
[drm:gen8_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

That's interesting, I'm seeing the same errors in my OpenBSD system since they upgraded to Xorg 1.19.5; no flickering though :)

GonzaloP wrote:I am running Debian 9 and the VGA is VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09)

Have you tried removing xserver-xorg-video-intel?

Have you added firmware-misc-nonfree?

Use an Xorg configuration file to force the AccelMethod but I don't think that is the issue here — jessie defaulted to UXA so switching to SNA gave a significant boost, stretch defaults to SNA but the Intel DDX driver is now discouraged by Debian in favour of Xorg's builtin modesetting driver.
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Re: Debian Gnome Flickers

Postby yeti » 2018-01-05 07:42

I see a probably similar flickering with Stretch on a Thinkpad-510 (1600x900 display) and `dmesg` shows lots of the following lines:
Code: Select all
[336200.037408] [drm:ironlake_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[336200.037456] [drm:ironlake_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun

Sometimes even the graphics collapses to a black screen, sometimes with some flickering pixels only at the "leftest" side. This may happen less than once a week and sometimes multiple times a day and so far I don't see a usage pattern triggering this.
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Re: Debian Gnome Flickers

Postby GonzaloP » 2018-01-05 08:41

Yeti, nice to share the pain with you. I am experiencing the same, the problem started for me around 1 week ago as well.

yeti wrote:I see a probably similar flickering with Stretch on a Thinkpad-510 (1600x900 display) and `dmesg` shows lots of the following lines:
Code: Select all
[336200.037408] [drm:ironlake_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[336200.037456] [drm:ironlake_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun

Sometimes even the graphics collapses to a black screen, sometimes with some flickering pixels only at the "leftest" side. This may happen less than once a week and sometimes multiple times a day and so far I don't see a usage pattern triggering this.
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Re: Debian Gnome Flickers

Postby Wheelerof4te » 2018-01-05 09:16

viewtopic.php?f=5&t=135567

Note that in the light of the Meltdown and Spectre, running an unpatched, older kernel will pose a major security risk. Try to disable 3D animations in GNOME instead.
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Re: Debian Gnome Flickers

Postby GonzaloP » 2018-01-05 12:40

Hi,

Thanks for the answer. I did installed firmware-misc-nonfree but I did not remove the xserver-xorg-video-intel. Don't I need that driver to run X?


Head_on_a_Stick wrote:
GonzaloP wrote:
Code: Select all
[drm:gen8_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

That's interesting, I'm seeing the same errors in my OpenBSD system since they upgraded to Xorg 1.19.5; no flickering though :)

GonzaloP wrote:I am running Debian 9 and the VGA is VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09)

Have you tried removing xserver-xorg-video-intel?

Have you added firmware-misc-nonfree?

Use an Xorg configuration file to force the AccelMethod but I don't think that is the issue here — jessie defaulted to UXA so switching to SNA gave a significant boost, stretch defaults to SNA but the Intel DDX driver is now discouraged by Debian in favour of Xorg's builtin modesetting driver.
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Re: Debian Gnome Flickers

Postby Wheelerof4te » 2018-01-05 13:03

GonzaloP wrote: but I did not remove the xserver-xorg-video-intel. Don't I need that driver to run X?


No, you don't if you use Intel iGPU from 2008. onwards. Newer cards will use modesetting (i915 kernel driver). I don't think firmware package will help, honestly.
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Re: Debian Gnome Flickers

Postby Bulkley » 2018-01-05 16:06

Kernel 4.9.0-5 came down for Stable last night. Does that help?
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Re: Debian Gnome Flickers

Postby Wheelerof4te » 2018-01-05 16:32

^
For the stable distribution (stretch), this problem has been fixed in version 4.9.65-3+deb9u2

No, since it is the same 4.9.65 version that contains the bug. Only later upstream version will fix it.
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Re: Debian Gnome Flickers

Postby GonzaloP » 2018-01-06 15:09

It doesn't, I just tried, and when I opened the console everything freezes.

Bulkley wrote:Kernel 4.9.0-5 came down for Stable last night. Does that help?
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Re: Debian Gnome Flickers

Postby GonzaloP » 2018-01-06 16:43

Any other idea on how to solve this issue? I've tried all what was suggested and it didn't work out.
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Re: Debian Gnome Flickers

Postby dcihon » 2018-01-06 17:13

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Re: Debian Gnome Flickers

Postby GonzaloP » 2018-01-07 04:35

I to /etc/environment the line:

Code: Select all
CLUTTER_PAINT=disable-clipped-redraws:disable-culling


And it just makes it worst. Still I couldn't find a solution for this.
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Re: Debian Gnome Flickers

Postby Wheelerof4te » 2018-01-08 13:06

There isn't a solution. Only option is to use another kernel that doesn't have that problem. Or wait with an outdated, insecure kernel for Debian 9.4.
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Re: Debian Gnome Flickers

Postby GonzaloP » 2018-01-08 15:20

So, this problem has been reported already?

Thanks
Wheelerof4te wrote:There isn't a solution. Only option is to use another kernel that doesn't have that problem. Or wait with an outdated, insecure kernel for Debian 9.4.
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