Re: How to enable bios-disabled soundcard?

[Andreas Mohr <andi@rhlx01.fht-esslingen.de>]

Hi,

[CC'ing ALSA list]

On Thu, May 18, 2006 at 05:09:47PM +0300, Meelis Roos wrote:
> Context: IBM X20 laptop with integrated PCI CS4281 soundcard. Loading 
> snd_cs4281 gives these messages and registers no alsa device:
> 
> ACPI: PCI interrupt for device 0000:00:0b.0 disabled
> CS4281: probe of 0000:00:0b.0 failed with error -5
> 
> Error -5 seems to be -EIO.
> 
> There is no option ib bios to enable/disable the soundcard and the bios 
> is almost the latest (2.23, latest 2.25 fixes only unrelated things by 
> changelog).

The mail subject most likely is wrong, since the IRQ message above
doesn't suggest a BIOS issue at all,
since the message is most likely a result of calling snd_cs4281_free()
in failure path, which disables this IRQ again.

> lspci identifies the card as follows (pci ID is the same as in the 
> driver):
> 0000:00:0b.0 Multimedia audio controller: Cirrus Logic Crystal CS4281 PCI 
> Audio (rev 01)
> 
> I tried pci=routeirq. It distributed the interrupts differently but this 
> problem did remain.

I believe that it's a simple hardware mismatch failure in the main probe
function of this driver, nothing else.

> So how can I enable the soundcard?

The best way to find out is to edit snd_cs4281_probe() and add snd_printk()s
at all error paths to find the one which actually fails.

Andreas Mohr