[Bug 66812] New: regression in vt-switching between x servers with ums radeon driver

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66812

          Priority: medium
            Bug ID: 66812
          Assignee: xorg-driver-ati at lists.x.org
           Summary: regression in vt-switching between x servers with ums
                    radeon driver
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: FreeBSD
          Reporter: avg at icyb.net.ua
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: 7.7 (2011)
         Component: Driver/Radeon
           Product: xorg

Software:
    xorg-server-1.12.4
    xf86-video-ati-6.14.6

One peculiarity of my setup is that I run two X servers.  And the regression is
exactly about that.
Until  a recent upgrade (from driver version 6.14.3) everything worked just
fine.  But now if I do a direct VT-switch from one X-owned terminal to the
other, then I get a significant chance of my system hanging.

I see the following things when that happens.
In Xorg.log I sometimes get (repeated many times):
(EE) RADEON(0): Timeout trying to update memory controller settings !
(EE) RADEON(0): You will probably crash now ...
In system log I sometimes see (repeated many times):
info: [drm] wait idle failed status : 0xA0003030 0x00000003
Sometimes the system just resets without leaving any clues.

Here is another interesting point.  If first I do a VT-switch to a non-graphic
(console) terminal and then to the other X terminal, then the problem never
happens.

Downgrading xf86-video-ati to 6.14.4 seems to fix the problem.
I haven't tried 6.14.5 yet.

I can do more bisecting / testing, but perhaps you would have some pointers on
things that I should try first.

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