[Openchrome-users] [openChrome] #392: openSUSE 11.4/Ubuntu 11.04 openchrome IRQ 0 driver freeze system form "klick" to "klick"

[John Robinson]

I don't remember my trac username or I'd reply to this there. Could 
somebody please look it up for me?

On 07/03/2011 12:07, OpenChrome Trac wrote:
> #392: openSUSE 11.4/Ubuntu 11.04  openchrome IRQ 0 driver freeze system form
> "klick" to "klick"
> ---------------------+------------------------------------------------------
> Reporter:  fazerxlo  |       Owner:  somebody
>      Type:  defect    |      Status:  new
> Priority:  critical  |   Component:  xdriver
>   Version:  0.2.904   |    Keywords:
> Blocking:            |   Blockedby:
> ---------------------+------------------------------------------------------
>
> Comment(by schlobinux):
>
>   Maybe try the DisableIRQ option ?
>   Here's an extract from the openchrome man page :
>   Option "DisableIRQ"  "boolean"
>   Disables  the  vertical  blank IRQ.  This is a workaround for some
>   mainboards that have problems with IRQs coming from the Unichrome engine.
>   With IRQs disabled, DRI clients have no way to synchronize their drawing
>   to Vblank.  (IRQ is disabled by default on the KM400 and K8M800 chipsets.)

I'd try fiddling with BIOS IRQ-allocating settings and booting with 
various pci= kernel command line options before using DisableIRQ. It's 
worth checking dmesg for any suggestions, or try pci=noacpi or 
pci=routeirq or pci=biosirq or others mentioned in 
linux/Documentation/kernel-parameters.txt

Cheers,

John.