[Bug 28106] radeon KMS causes hardware conflict/interference with Intel wifi and audio, crashes wireless

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28106

--- Comment #9 from Øyvind Stegard <oyvinst at ifi.uio.no> 2010-05-18 12:19:44 PDT ---
(In reply to comment #8)
> Is there an option in your bios to assign different irqs to different pci
> devices?  Some systems set every device to the same irq.  If so, please try
> changing the setting to auto, or select different irqs for each device and see
> if that helps.  Also, please try both with and without msi enabled (boot with
> pci=nomsi).

Yes. However, the list looks very uninformative. It's under PCI config, and
basically contains just INTA-> 11, INTB -> 11, INTC -> 11, and so on. Tried
setting to Auto-select on all entries (instead of 11). System booted OK, but it
didn't help (on KMS+audio problems). Tried assigning sequentially from IRQ 3
and up, but then I got a really loud Thinkpad-style alarm beep, system didn't
get past POST, and BIOS informing that network controller was missing IRQ. So
obviously I switched back to default settings. The /proc/interrupts list didn't
really look any different with BIOS-autoconfig for PCI IRQs (IIRC).

Booting with option pci=nomsi does not help at all, even though it definitely
affects IRQ config, since /proc/interrupts contains no MSI-entries when booting
with this option.

I will now be attaching some info for system running 2.6.34 kernel on Ubuntu
Lucid x86 with ATIX1400 (KMS-mode). System has severe audio glitching with KMS,
and no glitching at all in UMS mode.

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