[alsa-devel] snd-hda-intel and MSI

Takashi Iwai tiwai at suse.de
Wed Sep 23 17:43:55 CEST 2009

At Wed, 23 Sep 2009 16:33:06 +0200,
Elimar Riesebieter wrote:
> Hi folks,
> are there any contradictions to enable-msi=1 by default?

MSI is broken on some platforms.  IIRC, almost all non-Intel platforms
didn't work until the recent ones.  So, it can't be enabled blindly as
default, unfortunately.

> There are
> users with chips like an
> 00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)
>         Subsystem: Hewlett-Packard Company Device 30f7
>         Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
>         Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>         Latency: 0, Cache Line Size: 64 bytes
>         Interrupt: pin B routed to IRQ 33
>         Region 0: Memory at dc500000 (64-bit, non-prefetchable) [size=16K]
>         Capabilities: <access denied>
>         Kernel driver in use: HDA Intel
> which only works with MSI. And it is somewhat hard to find the appropriate
> Documantation in HD-Audio.txt.

A patch is always welcome.

> 2nd it will be very hard for Distributers to
> maintain modul options by chip ID's.

It's not a question for distributors but the upstream maintainers 
to maintain the quirk table :)



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