[Bug 50655] ATI RV670 [Radeon HD 3870] Ioquake games causes GPU lockup (waiting for 0x00003039 last fence id 0x00003030)

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https://bugs.freedesktop.org/show_bug.cgi?id=50655

--- Comment #30 from Andy Furniss <lists@andyfurniss.entadsl.com> ---
I've just put my rv670 (HD3850) card back in my AGP box and can reliably get
etqw to lock after a few seconds with waiting for fence.

I may be too different from the OP for this to be relevant to this bug
differences -

AGP, 32 bit, running drm-fixes kernel, no writebacks and my bisect came up with
a commit postdating the original report.

But for me - 

1eedebc65b02130ef7a27062a1ed67972a317a08 is first bad commit
commit 1eedebc65b02130ef7a27062a1ed67972a317a08
Author: Marek Olšák <maraeo@gmail.com>
Date:   Thu Nov 1 02:00:37 2012 +0100

    r600g: re-enable handling of DISCARD_RANGE, improving performance

    It seems to work for me now. Even the graphics corruption is gone.

    This also boosts performance in Reaction Quake.

Gives a reliable rv670 lock up with etqw.

This is testing with mesa built with --disable-llvm (as R600_LLVM doesn't work
at all on this card)

It may (or may not) be worth anyone testing with mesa master to try resetting
it to the commit before the one above like -

make distclean
git clean -dfx
git reset --hard fa58644855e44830e0b91dc627703c236fa6712a

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