[BUG] 3.2-rcX radeon KMS system freeze

[Bob Tracy]

I've been trying to get KDE4 running on an Alpha, and I have things to
the point where FreeNX (non-KMS) KDE4 sessions work just fine.  When I
try a KDE4 session on the console with 3.2-rc[1-2] kernels and KMS
enabled, the KDE4 splash screen appears, and the expected left-to-right
fade-in of the five startup progress icons happens.  As soon as the
fifth icon (the big "K") is done appearing, I assume plasma-desktop
starts, and that's where the system locks-up solid.  Can't switch
virtual consoles, can't login remotely, etc.: system doesn't even
respond to pings.  Have to hit the reset switch to recover.

After rebooting, there's nothing to be found in any of the X11 and/or
syslog files as far as "Oops" messages or other errors.

Similar bad things happen when I try to test Gnome-3 sessions (KMS
required for non-fallback mode).  With FreeNX, the best I can do is test
Gnome-3 fallback mode (Gnome-2).

Apologies for the less-than-useful bug report.  If there's anything I
can do to generate/capture more diagnostic info, please don't hesitate
to let me know.  I'll be able to try a 3.2-rc3 kernel later today.

--Bob
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