Re: [BISECTED REGRESSION in 3.19-rc1] [drm/i915] WARNING: drivers/gpu/drm/drm_irq.c:1077 drm_wait_one_vblank
From: Andrey Skvortsov
Date: Mon Feb 23 2015 - 15:28:18 EST
On Mon, Feb 23, 2015 at 02:54:47PM +0200, Jani Nikula wrote:
> On Mon, 23 Feb 2015, Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx> wrote:
> > On Mon, 16 Feb 2015, Paul Bolle <pebolle@xxxxxxxxxx> 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@xxxxxxxx>
> > Date: Wed Jan 7 13:54:39 2015 +0100
> > drm/i915: Push vblank enable/disable past encoder->enable/disable
you wrote in your bug report (#89108), that you've got a black screen, when you tried drm-intel-nightly branch.
Do you have black screen with v4.0-rc1 on your eeepc?
If so, is it similar to that I described here https://lkml.org/lkml/2015/2/3/594 ?
As we both had drm_wait_one_vblank warnings, I assume that we have the same or similar chipsets.
And your black screen could be potentially the same as mine.
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