Further debugging today while I'm on-site with the kiosks.  The system
froze, as usual, after normal idle screen blanking.  I was able to login
via ssh and retrieve some details.

First, it appears that the basic screen blanking problem is somehow
related to the Radeon driver.  I will attach the Xorg.0.log file and a
gdb backtrace on the running but non-responsive Xorg process.  No
keyboard or mouse activity will un-blank the screen.

Here's the output from lspci | grep VGA:

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV516 
[Radeon X1300/X1550 Series]

I'll also attach the PCI ROM dump from the /sys/devices rom file for
this device.

This suggests that when we use Alt-SysRq-k to restore the system,
sometimes we trigger *another* bug in the driver which results in the
overall system crash.  See the attached apr1.full.kern.log file for what
details I could recover from the crash on April 1st; that corresponds to
the screen photo I took that day (the radeon_kernel_panic1.jpg

The Xorg "hang" bug which precedes this appears similar, but not
identical, to what is documented in #1664979:


I will continue to try to study the live Xorg process to see if I can
determine where its hung, but I may not have time this evening.  Let me
know if there are specific further debugging steps I can take to examine
either the Xorg hang or the subsequent crash which (sometimes) follows
on attempting to recover with Alt-SysRq-k.  (And note that I'll copy in
the files apport-bug generated from #1764211 later tonight, using my
"cdarroch" personal account, and then I'll try to close that extra bug

Thanks very much,

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  kernel panic in Radeon driver while screen blank

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