linux-kernel - Re: [BISECTED REGRESSION in 3.19-rc1] [drm/i915] WARNING: drivers/gpu/drm/drm_irq.c:1077 drm_wait_one

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Date:	Mon, 23 Feb 2015 23:28:02 +0300
From:	Andrey Skvortsov <andrej.skvortzov@...il.com>
To:	Sitsofe Wheeler <sitsofe@...il.com>
Cc:	Paul Bolle <pebolle@...cali.nl>,
	Daniel Vetter <daniel.vetter@...el.com>,
	David Airlie <airlied@...ux.ie>,
	intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Ville Syrjälä <ville.syrjala@...ux.intel.com>,
	Matt Roper <matthew.d.roper@...el.com>,
	Jani Nikula <jani.nikula@...ux.intel.com>
Subject: Re: [BISECTED REGRESSION in 3.19-rc1] [drm/i915] WARNING:
 drivers/gpu/drm/drm_irq.c:1077 drm_wait_one_vblank

On Mon, Feb 23, 2015 at 02:54:47PM +0200, Jani Nikula wrote:
> On Mon, 23 Feb 2015, Jani Nikula <jani.nikula@...ux.intel.com> wrote:
> > On Mon, 16 Feb 2015, Paul Bolle <pebolle@...cali.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@...ll.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
> 

Hi, Sitsofe,

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. 

-- 
Best regards,
Andrey Skvortsov

PGP Key ID: 0x57A3AEAD

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