[Bug 26789] New: Screen corruption when using radeon from 2.6.33 drm-next kernel

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=26789

           Summary: Screen corruption when using radeon from 2.6.33 drm-next
                    kernel
           Product: xorg
           Version: 7.5
          Platform: x86 (IA32)
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: hansmbakker at gmail.com
         QAContact: xorg-team at lists.x.org


I'm testing the 2.6.33 drm-next kernel from
http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-next/current/ on Kubuntu
Lucid.

My gpu is an Ati Modility Radeon HD 4530 with 256 MB RAM.

When using this kernel I encounter glitches / bad rendering in firefox: some
characters are distorted / replaced by other characters. Also sometimes
glitches show up the firefox menu bar or parts of it disappear. When closing a
javascript photo frame popup it leaves a black garbled area which can be cleant
by scrolling up and down.

Dmesg reports this set of errors many times repeated:
[  916.493405] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream !           
[  916.522047] radeon 0000:01:00.0: z/stencil with no depth buffer              
[  916.522053] radeon 0000:01:00.0: r600_packet3_check:1055 invalid cmd stream
140

Maybe glitches will show up in other programs as well. I did not encounter this
when using other kernels.

If I need to specify more information please ask.


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