Bug 24429

Summary:	xf86-video-intel 2.9.0 fails to detect DVI monitor on Mac Mini
Product:	xorg	Reporter:	Shawn Rutledge <shawn.t.rutledge>
Component:	Driver/intel	Assignee:	ykzhao <yakui.zhao>
Status:	RESOLVED DUPLICATE	QA Contact:	Xorg Project Team <xorg-team>
Severity:	critical
Priority:	high	Keywords:	NEEDINFO, regression
Version:	7.2 (2007.02)
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
URL:	http://bugs.gentoo.org/show_bug.cgi?id=287705
Whiteboard:
i915 platform:		i915 features:

Description Shawn Rutledge 2009-10-09 15:03:11 UTC

2.8.1 is OK.  With 2.9.0, X fails to start because it says it was unable to
detect that any monitor is connected (and presumably therefore does not know
the resolution) and finally "screens found but none have a usable
configuration."  I have the last-generation Mac Mini with Intel graphics and
Core 2 Duo 1.86 GHz, and a Dell 2405 DVI monitor connected.

Comment 1 Gordon Jin 2009-10-09 18:30:28 UTC

Please provide Xorg log and dmesg accroding to http://intellinuxgraphics.org/how_to_report_bug.html.

Comment 2 ykzhao 2009-10-09 19:49:44 UTC

Please try the KMS mode and see whether the issue still exists.

In the KMS mode it will try to read the EDID by using the CRT_DDC bus.
   >commit 57cdaf90f5f607eb029356074fefb66c9b1c0659
Author: Keith Packard <keithp@keithp.com>
Date:   Fri Sep 4 13:07:54 2009 +0800

    drm/I915: Use the CRT DDC to get the EDID for DVI-connector on Mac

As the UMS mode is not supported, the above patch is not back-ported to 2.9.0 intel driver.

thanks.

Comment 3 ykzhao 2009-10-09 22:53:55 UTC

As this issue is also related with the following commit and it has the same root cause as bug24255, it will be marked as the dup of bug24255.
   >commit 02fe9be695f7e209944bd0f7b67950f93619feee
Author: Zhao Yakui <yakui.zhao@intel.com>
Date:   Tue Sep 22 10:58:38 2009 +0800

    Check whether the DVI-I/D is connected or disconnected based on EDID

In fact this issue is already fixed by the following commit. Please try the Eric's drm-intel-next tree and see whether the issue still exists. Of course the 2.6.32-rc1/rc3 is also ok. (it ships the following commit).
    >commit 57cdaf90f5f607eb029356074fefb66c9b1c0659
Author: Keith Packard <keithp@keithp.com>
Date:   Fri Sep 4 13:07:54 2009 +0800

    drm/I915: Use the CRT DDC to get the EDID for DVI-connector on Mac

*** This bug has been marked as a duplicate of bug 24255 ***

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