Bug 23462

Summary:	DVI/EDID broken with Intel i945 graphics and 2.6.37-rc2
Product:	Drivers	Reporter:	Maciej Rutecki (maciej.rutecki)
Component:	Video(DRI - Intel)	Assignee:	drivers_video-dri-intel (drivers_video-dri-intel)
Status:	CLOSED CODE_FIX
Severity:	normal	CC:	chris, maciej.rutecki, rjw, tino.keitel
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6.37-rc2	Subsystem:
Regression:	Yes	Bisected commit-id:
Bug Depends on:
Bug Blocks:	21782

Description Maciej Rutecki 2010-11-21 16:32:46 UTC

Subject    : DVI/EDID broken with Intel i945 graphics and 2.6.37-rc2
Submitter  : Tino Keitel <tino.keitel@tikei.de>
Date       : 2010-11-16 18:49
Message-ID : 20101116184914.GA15794@mac.home
References : http://marc.info/?l=linux-kernel&m=128993389113001&w=2

This entry is being used for tracking a regression from 2.6.36. Please don't
close it until the problem is fixed in the mainline.

Comment 1 Tino Keitel 2010-12-03 06:53:38 UTC

Fixed with 2.6.37-rc4-git2.

Comment 2 Rafael J. Wysocki 2010-12-03 20:29:41 UTC

By which commit?

Comment 3 Tino Keitel 2010-12-03 20:46:15 UTC

I tested "drm/i915/sdvo: Always fallback to querying the shared DDC line" (see LKML) which helped. This commit is merged in 2.6.37-rc4-git2:

commit 0c1dab89ee0e483f382391d6aec77db4affb0931
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Tue Nov 23 22:37:01 2010 +0000

    drm/i915/sdvo: Always fallback to querying the shared DDC line
    
    On a few devices, like the Mac Mini, the CRT DDC pins are shared between
    the analog connector and the digital connector. In this scenario, rely
    on the EDID to determine if a digital panel is connected to the digital
    connector.
    
    Reported-and-tested-by: Tino Keitel <tino.keitel@tikei.de>
    Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>