Bug 21623

Summary: [830] Corrupt display regression since 2.4.x
Product: xorg Reporter: Bryce Harrington <bryce>
Component: Driver/intelAssignee: Carl Worth <cworth>
Status: RESOLVED FIXED QA Contact: Xorg Project Team <xorg-team>
Severity: normal    
Priority: medium CC: alex_mayorga
Version: 7.4 (2008.09)   
Hardware: x86 (IA32)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
Screenshot showing problem
none
Xorg.0.log none

Description Bryce Harrington 2009-05-07 15:09:16 UTC 
Forwarding this bug from a Ubuntu reporter (alex-mayorga):
https://bugs.edge.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/213171

[Problem]
Graphic display is incorrect on an i830MG-based HP Pavilion N5495.  With xserver 1.6, it displays properly on driver version 2.4 on xserver 1.6, but not on driver versions 2.6.3 or 2.7.0.

[lspci]
00:00.0 Host bridge [0600]: Intel Corporation 82830 830 Chipset Host Bridge [8086:3575] (rev 03)
	Subsystem: Intel Corporation Device [8086:1969]
00:02.0 VGA compatible controller [0300]: Intel Corporation 82830 CGC [Chipset Graphics Controller] [8086:3577] (rev 03)
	Subsystem: Hewlett-Packard Company Device [103c:0021]
Comment 1 Bryce Harrington 2009-05-07 15:10:00 UTC 
Created attachment 25614 [details]
Screenshot showing problem
Comment 2 Bryce Harrington 2009-05-07 15:10:34 UTC 
Created attachment 25615 [details]
Xorg.0.log
Comment 3 Chris Wilson 2010-07-24 03:47:34 UTC 
It's a modesetting issue, so it will be useful to check on current bits and attach a dmesg with drm.debug=4
Comment 4 Chris Wilson 2011-01-26 02:05:43 UTC 
That looks very much like the bug fixed with:

commit 897493504addc5609f04a2c4f73c37ab972c29b2
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Sun Sep 12 18:25:19 2010 +0100

    drm/i915: Ensure that the crtcinfo is populated during mode_fixup()
    
    This should fix the mysterious mode setting failures reported during
    boot up and after resume, generally for i8xx class machines.
    
    Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=16478
    Reported-and-tested-by: Xavier Chantry <chantry.xavier@gmail.com>
    Buzilla: https://bugs.freedesktop.org/show_bug.cgi?id=29413
    Tested-by: Daniel Vetter <daniel@ffwll.ch>
    Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
    Cc: stable@kernel.org

After the translation to KMS, that is likely to be the right fix.

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