[Bug 34313] RV770 lock-up with OpenGL

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https://bugs.freedesktop.org/show_bug.cgi?id=34313

--- Comment #14 from eric <e.durmin@xxxxxxx> 2011-04-11 06:00:55 PDT ---
This happens also with r300g + linux-2.6.38.2 + KMS.

I can not always reproduce this GPU lockup, but working (scrolling, opening a
new tab) with big or fullscreen windows seems to trigger this lockup... but not
right after a reboot... so it's difficult to reproduce. Hopefully someone finds
a better way to reproduce this lockup.

When the lockup starts the display disappears (turns to black) for 1 or 2
seconds, then the next will happen:
1) display will return and everything will work again, but the next lockup will
happen soon;
2) display will return but only mouse and keyboard are working, the display
will be frozen except the mouse pointer can move around; I have to exit all
running applications (alt+f4) blindly because the changes will not be seen, go
to console (ctrl+alt+f1) and from there reboot the system.

Switching to console (ctrl+alt+f1) usually works and there the display is
working again, but killing and restarting X will not work, the only way to get
X back is to reboot.

During the lockup the kernel.log will be full of:
  kernel: [drm:radeon_cs_ioctl] *ERROR* Failed to schedule IB !
  kernel: [drm:radeon_ib_schedule] *ERROR* radeon: couldn't schedule IB(1).
These lines are going for ever until I kill X.

Some lockups looking like mine were solved by turning off 'EnablePageFlip' in
xorg.conf or setting 'agpmode' to -1, 1 or 4 in modprobe.conf or exporting
'LIBGL_ALWAYS_INDIRECT=1'... none of these solutions worked for me. Maybe
turning off KMS works, but without KMS certain things won't work/are different,
so I try to keep using KMS.

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