[Bug 33790] [r300g] Black windows with opengl apps (ex. glxgears)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=33790

--- Comment #5 from Alex Deucher <agd5f at yahoo.com> 2011-08-05 10:45:00 PDT ---
vblank interrupts (or interrupts in general) may not be working on your system.
 Try `cat /proc/interrupts` and see if the count on the radeon line increases. 
If not, you might try booting with pci=nomsi or noapic or irqpoll on the kernel
commandline in grub.

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