[Bug 39612] New: radeon blocks with new style fencing

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https://bugzilla.kernel.org/show_bug.cgi?id=39612

           Summary: radeon blocks with new style fencing
           Product: Drivers
           Version: 2.5
    Kernel Version: >= 2.6.37
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@xxxxxxxxxxxxxxxxxxxx
        ReportedBy: linas_fi@xxxxxxxxx
                CC: alexdeucher@xxxxxxxxx
        Regression: Yes


I am using a Radeon HD 3600 in kernel 2.6.36 with xf86-video-ati (KMS). Since
2.6.37 when starting the X server the screen goes black and never shows the
desktop.

kernel 2.6.36
startx -> Screen goes black -> The wallpaper appears -> The DE loads

kernel >= 2.6.37
startx -> Screen goes black -> You can't switch virtual terminals -> REISUB ->
Downgrade kernel

Reproducible: Always

Bisecting shows that it started failing at
d0f8a854c340986359a3b0a97e380c71def7a440: drm/radeon/kms/r6xx+: use new style
fencing (v3)

http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.37.y.git;a=commit;h=d0f8a854c340986359a3b0a97e380c71def7a440

Downstream bug https://bugs.archlinux.org/task/23422

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