[REGRESSION] Occasional Flickering with Linux 4.6.0-rc* on Scree connected to eDP

[REGRESSION] Occasional Flickering with Linux 4.6.0-rc* on Scree connected to eDP

[Arnd Hannemann]

Hi,

with 4.6.0-rc4 and -rc6 kernel I experience occasional (every 1-2 Minutes)
on my laptop (thinkpad t440s) screen.
This flickering has not been there in 4.5.
Unfortunately the laptop does not boot with 4.6-rc1.

The laptop screen is connected via eDP. I have two other monitors connected to the dock,
conected via DP. They do not show the flickering.
There is nothing in the log when the flickering occurs (drm.debug=14).

Compared to 4.5.0 I see the following message with 4.6.0 after bootup:

[ 5921.720651] [drm] Reducing the compressed framebuffer size. This may lead to less power savings than a non-reduced-size. Try to increase stolen memory size if available in BIOS.

I tried to increase graphics memory in bios, however, this did not seem to have any effect.

Any idea how to track this down? I'm happy to provide more info.

Best Regards
Arnd
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Re: [REGRESSION] Occasional Flickering with Linux 4.6.0-rc* on Scree connected to eDP

[Jani Nikula]

On Wed, 04 May 2016, Arnd Hannemann <arnd@arndnet.de> wrote:
> Hi,
>
> with 4.6.0-rc4 and -rc6 kernel I experience occasional (every 1-2 Minutes)
> on my laptop (thinkpad t440s) screen.
> This flickering has not been there in 4.5.
> Unfortunately the laptop does not boot with 4.6-rc1.
>
> The laptop screen is connected via eDP. I have two other monitors connected to the dock,
> conected via DP. They do not show the flickering.
> There is nothing in the log when the flickering occurs (drm.debug=14).
>
> Compared to 4.5.0 I see the following message with 4.6.0 after bootup:
>
> [ 5921.720651] [drm] Reducing the compressed framebuffer size. This may lead to less power savings than a non-reduced-size. Try to increase stolen memory size if available in BIOS.
>
> I tried to increase graphics memory in bios, however, this did not seem to have any effect.
>
> Any idea how to track this down? I'm happy to provide more info.

Does i915.enable_psr=0 module parameter fix it? If so, it's probably
[1], otherwise please file a new bug at [2].

BR,
Jani.


[1] https://bugs.freedesktop.org/show_bug.cgi?id=95176
[2] https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&component=DRM/Intel


-- 
Jani Nikula, Intel Open Source Technology Center
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Re: [REGRESSION] Occasional Flickering with Linux 4.6.0-rc* on Scree connected to eDP

[Arnd Hannemann]

Hi,

probably a duplicate of
https://bugs.freedesktop.org/show_bug.cgi?id=95124

Sorry for the noise.

Best regards
Arnd

Am 04.05.2016 um 11:45 schrieb Arnd Hannemann:
> Hi,
> 
> with 4.6.0-rc4 and -rc6 kernel I experience occasional (every 1-2 Minutes)
> on my laptop (thinkpad t440s) screen.
> This flickering has not been there in 4.5.
> Unfortunately the laptop does not boot with 4.6-rc1.
> 
> The laptop screen is connected via eDP. I have two other monitors connected to the dock,
> conected via DP. They do not show the flickering.
> There is nothing in the log when the flickering occurs (drm.debug=14).
> 
> Compared to 4.5.0 I see the following message with 4.6.0 after bootup:
> 
> [ 5921.720651] [drm] Reducing the compressed framebuffer size. This may lead to less power savings than a non-reduced-size. Try to increase stolen memory size if available in BIOS.
> 
> I tried to increase graphics memory in bios, however, this did not seem to have any effect.
> 
> Any idea how to track this down? I'm happy to provide more info.
> 
> Best Regards
> Arnd
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
> 

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