[Bug 26681] New: [Mobility M6 LY] Dim Green display with DefaultDepth 16

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=26681

           Summary: [Mobility M6 LY] Dim Green display with DefaultDepth 16
           Product: xorg
           Version: 7.5
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: apendolino at gmail.com
         QAContact: xorg-team at lists.x.org


Created an attachment (id=33471)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=33471)
Image of speculated cause of problem

Bug:
When setting "defaultdepth 16" in the Screen section of xorg.conf the display
looks dim and has a green tint.

Hardware:
IBM Thinkpad X32
Radeon Mobility 7000 aka M6 LY

Software
Arch Linux kernel 2.6.32-ARCH
xorg-server 1.7.5-1
xf86-video-ati 6.12.4-3

Additional information:
In spite of the color issue, the system is completely usable when defaultdepth
16 is set. Opengl/DRI is only possible on this card on this setting because of
the lack of VRAM.

I have tried both kdm and gdm. Additionally, a screen shot made when the
display is wrong will look correct when defaultdepth is changed to 24. The bug
has been reported on Fedora 12 and Ubuntu 9.10 as well (see below).

Speculation:
It appears that something is using R5G6B5 values somewhere that is supposed to
take R8G8B8 values. I did a quick matlab test of this theory and the attached
image shows exactly how Lena looks when I have the defaultdepth 16 setting.

Other reports of the issue:
This may be the underlying cause behind this bug as well (maybe it should have
been the same bug?):
https://bugs.freedesktop.org/show_bug.cgi?id=25141
Fedora:
http://forums.fedoraforum.org/showthread.php?p=1323534
Debian:
http://osdir.com/ml/debian-bugs-dist/2010-01/msg05447.html


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