[Bug 25469] New: [RS690] Screen corruption on X [KMS]

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=25469

           Summary: [RS690] Screen corruption on X [KMS]
           Product: xorg
           Version: 7.5
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: turmlos at comcast.net
         QAContact: xorg-team at lists.x.org


Created an attachment (id=31775)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=31775)
Screenshot

I am experiencing screen/font corruption in X when using kernel modesetting. 
The logs show no signs of trouble.  Userspace modesetting has not given me any
problems.

Dave Airlie said that this may be related to sideport memory.  The machine in
question is a Gateway LT3103u, which ships with X1270 graphics, making it a
M690T.  According to Wikipedia, the M690T features "an optional 16-bit DDR2
side-port memory with maximum 128 MiB."  I believe Gateway has implemented
this, as can be seen by the memory chip between the chipset and battery in this
image:
http://i340.photobucket.com/albums/o328/Secret_Asian_Man/IMG_6610.jpg

Unfortunately there is no option to disable sideport memory in the BIOS, nor
are there any BIOS updates available from Gateway.

I'm using libdrm & xf86-video-ati from git master, along with xserver's
server-1.7-branch and mesa's mesa_7.7_branch.  The kernel is 2.6.32 with the   
drm-radeon-next repository merged.  I've also encountered this problem with
Fedora 11/12 in the past.


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