linux-kernel - [bisected] offset display bug in i915

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Message-ID: <1289211512.3916.383.camel@constitution.bos.jonmasters.org>
Date:	Mon, 08 Nov 2010 05:18:32 -0500
From:	Jon Masters <jonathan@...masters.org>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [bisected] offset display bug in i915

Hi Chris,

The following patch that you recently committed breaks my ASUS Eee PC
1015PEM by causing the display to be offset by about 1 inch (a few
centimeters) when the mode is (re)set during boot. I previously posted
both photographs and video of the problem in another "PROBLEM" thread.

Here is the offending commit found through bisection:

219adae138513bae20b256f1946b9cb3b75ca05c is the first bad commit
commit 219adae138513bae20b256f1946b9cb3b75ca05c
Author: Chris Wilson <chris@...is-wilson.co.uk>
Date:   Thu Sep 16 23:05:10 2010 +0100

    drm/i915: Cache LVDS EDID

    We assume that the panel is permenantly connected and that the EDID
    data is consistent from boot, so simply cache the whole EDID for the
    panel.

    Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>

I'll look at the patch. Either the EDID is *not* consistent (in which
case, why are we not seeing other bugs like this?) or there is something
specific to this system or panel used.

Jon.

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