linux-kernel - i915: 2.6.36-rc2 wrong resolution on gdm start

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Message-ID: <1282611655.2177.19.camel@localhost.localdomain>
Date:	Tue, 24 Aug 2010 03:00:55 +0200
From:	Ivan Bulatovic <combuster@....com>
To:	linux-kernel@...r.kernel.org
Cc:	dri-devel@...ts.freedesktop.org, jbarnes@...tuousgeek.org,
	eric@...olt.net
Subject: i915: 2.6.36-rc2 wrong resolution on gdm start

While in init3, resolution is native, KMS works fine, no problems at
all. As soon as gdm starts it seems that TV1 output is recognized as
connected even if it isn't so resolution on VGA output is degraded from
native 1280x1024 to 1024x768 on startup.

I've disabled LVDS output with video=LVDS-1:d because the cable looses
connection in certain lid positions.

2.6.36-rc1 didn't have this issue, 2.6.36-rc2 did so I've bisected and
it came down to this commit:

9d0498a2bf7455159b317f19531a3e5db2ecc9c4 is the first bad commit
commit 9d0498a2bf7455159b317f19531a3e5db2ecc9c4
Author: Jesse Barnes <jbarnes@...tuousgeek.org>
Date:   Wed Aug 18 13:20:54 2010 -0700

    drm/i915: wait for actual vblank, not just 20ms

Waiting for a hard coded 20ms isn't always enough to make sure a vblank
period has actually occurred, so add code to make sure we really have
passed through a vblank period (or that the pipe is off when disabling).

This prevents problems with mode setting and link training, and seems to
fix a bug like https://bugs.freedesktop.org/show_bug.cgi?id=29278, but
on an HP 8440p instead.  Hopefully also fixes
https://bugs.freedesktop.org/show_bug.cgi?id=29141.

    Signed-off-by: Jesse Barnes <jbarnes@...tuousgeek.org>
    Signed-off-by: Eric Anholt <eric@...olt.net>

:040000 040000 9941813d0f0bc4e141a87696d34f1d1b9087711b
2e407ad1d03b60f0e5b020313a8a63bd176b4005 M drivers

I'm sending you dmesg, xorg and xrandr logs as attachements. GM965 on
DELL Vostro 1310 is in question. Thanks,

Ivan

View attachment "dmesg.log.1" of type "text/plain" (72519 bytes)

View attachment "xorg.log.1" of type "text/plain" (52412 bytes)

View attachment "xrandr.log.1" of type "text/plain" (682 bytes)