[Bug 41668] Screen locks up at random points when using a 3D compositing wm (gnome-shell) on an rv515 (radeon mobility x1300)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=41668

--- Comment #18 from Przemyslaw Kochanski <przemyslaw at kochanski.biz> 2011-12-15 06:20:29 PST ---
(In reply to comment #13)
> Try the following options in the kernel command line in grub:
> pci=nomsi
> noapic
> irqpoll
> and see if any of them help.

I've tried your suggestion and it worked! I've discovered the following:

"pci=nomsi noapic irqpoll" no freeze
"pci=nomsi irqpoll" no freeze
"irqpoll" no freeze
"pci=nomsi" no freeze
"noapic" no freeze
"" freeze

So far without any of this options I can reproduce the crash in 100% cases
under 1 minute of moving image in Gimp. I did it many times when backtracing.
However, there is slight probability that I just got lucky with one of options.
I'm 100% sure I've run `update-grub` after every /etc/default/grub change.

Assuming that all of this options fix the problem, which option should I use
(witch one disables least things)? I found the following but I don't understand
much:

noapic: [SMP,APIC] Tells the kernel to not make use of any IOAPICs that may be
present in the system.

irqpoll: [HW] When an interrupt is not handled search all handlersfor it. Also
check all handlers each timerinterrupt. Intended to get systems with badly
brokenfirmware running.

pci=nomsi: [MSI] If the PCI_MSI kernel config parameter isenabled, this kernel
boot option can be used todisable the use of MSI interrupts system-wide.

And finally: Is it a proper fix, or just a workaround?

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