[BISECTED REGRESSION in 3.19-rc1] [drm/i915] WARNING: drivers/gpu/drm/drm_irq.c:1077 drm_wait_one_vblank

[Jani Nikula]

On Mon, 23 Feb 2015, Jani Nikula <jani.nikula at linux.intel.com> wrote:
> On Mon, 16 Feb 2015, Paul Bolle <pebolle at tiscali.nl> wrote:
>> I still see this on v3.19. I booted with drm.debug=0x4. The almost 2K
>> lines in dmesg containing either "[drm" or this WARNING are pasted
>> below. I really know nothing about all this, but I do note that only the
>> WARNINGS are preceded by:
>>     [drm:intel_calculate_wm] FIFO watermark level: -5
>>     [drm:i9xx_update_wm] FIFO watermarks - A: 26, B: 8
>>
>> But perhaps that's another symptom of the same issue. A bit of staring
>> at the code couldn't help me determine that.
>>
>> Perhaps these debug messages help someone in discovering what might be
>> going on here.
>
> Please try v4.0-rc1 or try cherry-picking this on top of v3.19 and
> report back:
>
> commit f9b61ff6bce9a44555324b29e593fdffc9a115bc
> Author: Daniel Vetter <daniel.vetter at ffwll.ch>
> Date:   Wed Jan 7 13:54:39 2015 +0100
>
>     drm/i915: Push vblank enable/disable past encoder->enable/disable

https://bugs.freedesktop.org/show_bug.cgi?id=89108

>
> BR,
> Jani.
>
>
>
> -- 
> Jani Nikula, Intel Open Source Technology Center

-- 
Jani Nikula, Intel Open Source Technology Center