Bug 10055 - i915 GM DRI white box hardware cursor- apparently due to RemoveOverlaps problem in xf86Bus.c
Summary: i915 GM DRI white box hardware cursor- apparently due to RemoveOverlaps probl...
Alias: None
Product: xorg
Classification: Unclassified
Component: Server/General (show other bugs)
Version: 6.9.0
Hardware: x86 (IA32) FreeBSD
: medium normal
Assignee: Xorg Project Team
QA Contact: Xorg Project Team
URL: http://www.freebsd.org/cgi/query-pr.c...
Keywords: patch
: 10176 (view as bug list)
Depends on:
Reported: 2007-02-21 10:28 UTC by Chris Billington
Modified: 2018-06-12 16:57 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:

Xorg.0.log with 6.9.0 port (65.20 KB, text/plain)
2007-02-21 13:41 UTC, Chris Billington
no flags Details
Xorg.0.log with patched xf86Bus.c (61.67 KB, text/plain)
2007-02-21 13:43 UTC, Chris Billington
no flags Details
xf86Bus.c as edited to revert to v1.3 RemoveOverlaps code (80.19 KB, text/plain)
2007-02-21 13:48 UTC, Chris Billington
no flags Details

Description Chris Billington 2007-02-21 10:28:58 UTC
Please see http://www.freebsd.org/cgi/query-pr.cgi?pr=108582 for details including DRI/drm versions etc.

Symptoms: when enabling DRI on i915GM FreeBSD 6.2-STABLE with Xorg 6.9.0, HW cursor appears as white square. DRI appears to initialise OK. If run glxgears, however, machine locks hard.

As noted in PR it appears that the revisions made to RemoveOverlaps in xf86Bus.c for the 6.9.0 release cause this problem. The memory address ranges for the i915GM are changed on loading Xorg to values different to those detected on boot (and also in Windows). 

Reverting to the overlaps code in the previous version 1.3 of xf86Bus.c (leaving in any subsequent changes elsewhere) and recompiling Xorg-server port fixes the problem

Diff used was:

Report is posted here because it seems the code causing the issue on i915GM has survived into the Xorg 7.x Modular code, it's still in HEAD.

Please could a knowledgeable person check?
Comment 1 Chris Billington 2007-02-21 13:41:16 UTC
Created attachment 8806 [details]
Xorg.0.log with 6.9.0 port

Xorg.0.log with 6.9.0 port, pci overlap oddly detected, 
%grep ALLOC Xorg.hwc.log
(WW) ****INVALID MEM ALLOCATION**** b: 0xffe80000 e: 0xffefffff correcting
(WW) ****INVALID MEM ALLOCATION**** b: 0xffe40000 e: 0xffe7ffff correcting
Comment 2 Chris Billington 2007-02-21 13:43:14 UTC
Created attachment 8807 [details]
Xorg.0.log with patched xf86Bus.c

with patched xf86Bus.c, note no ALLOC errors
Comment 3 Chris Billington 2007-02-21 13:48:12 UTC
Created attachment 8808 [details]
xf86Bus.c as edited to revert to v1.3 RemoveOverlaps code
Comment 4 Daniel Stone 2007-02-27 01:36:33 UTC
Sorry about the phenomenal bug spam, guys.  Adding xorg-team@ to the QA contact so bugs don't get lost in future.
Comment 5 Alan Coopersmith 2009-09-07 01:09:59 UTC
*** Bug 10176 has been marked as a duplicate of this bug. ***
Comment 6 Adam Jackson 2018-06-12 16:57:26 UTC
RemoveOverlaps hasn't been a thing in a very long time.

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