[Bug 20351] New: [x700][EXA] lockups with >=xf86-video-ati-6.10.0

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=20351

           Summary: [x700][EXA] lockups with >=xf86-video-ati-6.10.0
           Product: xorg
           Version: unspecified
          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: zsitvaij at gmail.com
         QAContact: xorg-team at lists.x.org


Created an attachment (id=23366)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=23366)
xorg.conf

Steps to reproduce:

1. use EXA with EXAVSync option enabled
2. launch 1-2 instances of konsole or konqueror (3.5.10)

This results in an immediate lockup. Two cases:
a. If the kernel drm and radeon modules are loaded and DRI works, this means
that the mouse can still move sluggishly across the screen, sysrq commands
work, and commands will still work from an existing ssh session. It is not
possible to switch to VT or launch a new and working X instance.

b. Without the kernel modules, the lockup is complete. No sysrq commands work,
mouse doesn't move, ssh session is lost.

System:
OS: Gentoo
kernel: 2.6.28-gentoo-r2 (uvesafb is used with v86d-0.1.9)
xorg-server: 1.5.3-r2 (also tested with 1.6.0)
mesa: 7.3
libdrm: 2.4.5

Using git-bisect on xf86-video-ati, it seems that the guilty commit is
http://cgit.freedesktop.org/xorg/driver/xf86-video-ati/commit/?id=4d98acbca2e630056bf56cdcd0e23007fded2ced
(between versions 6.9.0 and 6.10.0).

Bugs #13998 and #18664 might be related to this one.

Nothing shows up about the lockup in Xorg.0.log, dmesg or messages.

Removing EXAVSync from the device options means that no immediate lockup occurs
on launching qt3 using applications, but that might only postpone it.


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