drm/i915: Delay with fbc enabled

drm/i915: Delay with fbc enabled

[Manuel Groß]

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Hello,

since upgrading to Kernel 4.6, I experienced weird display delay issues
on my Thinkpad x250. Downgrading to 4.5 or disabling fbc both fix that
issue.

In some specific X software (and only in those), modifications in UI
display (e.g. keyboard input) is shown with a delay up to ~1s.
Programs where I experienced this behaviour are e.g. sakura,
wireshark-qt and sublime.

This affects other Arch Linux users as well:
https://bugs.archlinux.org/task/49623
There is also a little more information on this.

If you can tell me what logs/analysis might be useful for you, I am
happy to provide it to you, although I am not that experienced with
this stuff.
-- 
Grüße/Regards
Manuel Groß

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Re: drm/i915: Delay with fbc enabled

[Jani Nikula]

On Fri, 24 Jun 2016, Manuel Groß <mgr@nordkrater.de> wrote:
> since upgrading to Kernel 4.6, I experienced weird display delay issues
> on my Thinkpad x250. Downgrading to 4.5 or disabling fbc both fix that
> issue.

If that's Haswell, FBC has been disabled by default (again, *sigh*). The
fix is now in Linus' tree, and will eventually trickle down to v4.6
stable kernels.

> If you can tell me what logs/analysis might be useful for you, I am
> happy to provide it to you, although I am not that experienced with
> this stuff.

It's possible we have a real fix in drm-intel-nightly branch of [1]
already, please try that with i915.enable_fbc=1.

BR,
Jani.

[1] http://cgit.freedesktop.org/drm-intel

-- 
Jani Nikula, Intel Open Source Technology Center
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drm/i915: Delay with fbc enabled

[Manuel Groß]

Hello,

since Kernel 4.6, the fbc is broken for me. Some specific X software
(e.g. wireshark-qt, sakura and sublime) display UI modifications, such
as keyboard input, with a delay up to ~1s.
Either downgrading to 4.5 or disabling fbc solve this problem.

This affects at least multiple Thinkpad and other users on Arch Linux:
https://bugs.archlinux.org/task/49623

I am no expert in this. So if I could provide anything more useful for
you, please let me know.
-- 
Grüße/Regards
Manuel Groß
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

drm/i915: Delay with fbc enabled

[Manuel Groß]

Hello,

since Kernel 4.6, the fbc is broken for me. Some specific X software
(e.g. wireshark-qt, sakura and sublime) display UI modifications, such
as keyboard input, with a delay up to ~1s.
Either downgrading to 4.5 or disabling fbc solve this problem.

This affects at least multiple Thinkpad and other users on Arch Linux:
https://bugs.archlinux.org/task/49623

I am no expert in this. So if I could provide anything more useful for
you, please let me know.
-- 
Grüße/Regards
Manuel Groß
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx