[Bug 96271] TF2: GPU lockup on HD 7950

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96271

--- Comment #8 from Stephen Liang <hi+freedesktop at stephenliang.pw> ---
Created attachment 124225
  --> https://bugs.freedesktop.org/attachment.cgi?id=124225&action=edit
Kernel log, dmesg, gallium debug logs during GPU hang and system crash

No good but I've got quite a bit of information! I tried with this command:

R600_DEBUG=noce,nohyperz GALLIUM_DDEBUG="800 noflush" steam
steam://rungameid/440

The GPU recovered and I was able to alt-tab to gnome terminal and grab the
dmesg. See "dmesg_after_alt_tab.txt".

I then continued to play the game and it hung again. This time, the entire
screen froze with only the mouse being able to move. Luckily, this time I was
able to drop to TTY4, and grab a dmesg. See "dmesg_after_hard_hang.txt", there
is certainly a lot more output here with quite a bit of call traces which I've
never seen before.

Now, I decided to restart X since the mouse still moved so I wondered if this
is an X issue. So I ran "sudo service gdm restart" and it crashed the system
with a calltrace displayed on screen on text mode. On restart, I checked the
kernel logs and I can see a lot of call traces, so it seems whatever happened
ended up tainting the kernel requiring the system to need a hard reset. See
"kernel_log_during_gdm_restart.txt".

Finally, since I ran this with GALLIUM_DDEBUG="800 noflush", I was able to
collect another gallium debug that goes along with this. I really hope this
information helps capture the state of the system at the time of crash. Please
let me know if you want me to try anything else.

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