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

[Jani Nikula]

On Wed, 04 May 2016, Arnd Hannemann <arnd at 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