Radeon KMS msi issues.

Michel Dänzer michel at daenzer.net
Thu Feb 16 01:57:34 PST 2012

On Mit, 2012-02-15 at 23:48 -0800, Neven Klacar wrote:
> https://bugs.freedesktop.org/show_bug.cgi?id=28106
> I was investigating the above bug, and for some reason radeon x1400
> cards that use msi based interrupts, are conflicting in some way with
> the msi interrupts used by the sound card and wifi chip. Doing
> anything display intensive will drop the wifi connection and make
> really choppy sound. 
> How can I disable msi on the radeon driver? Can it be turned off/on
> via a conf file? I tried echo 0 to msi_bus in /sys/bus/pci/devices/**/
> but it didnt work. 
> If I have to recompile the source where do I disable it? 

See commit a18cee15ed4c8b6a35f96b7b26a46bac32e04bd9 [0]: With current
kernels (at least as of 3.2), you can disable MSI with radeon.msi=0.
Otherwise you can modify the radeon_msi_ok function to return false.

[0] http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=a18cee15ed4c8b6a35f96b7b26a46bac32e04bd9

Earthling Michel Dänzer           |                   http://www.amd.com
Libre software enthusiast         |          Debian, X and DRI developer

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