Hi,
I just got a Biostar M7VIQ motherboard and am having a hell of a time
getting acceptable sound from the on-board Via 8235 sound with kernel
2.4.21 and ALSA 0.9.4. I found some useful information in
ALSA-Configuration.txt (see below) but that didn't really help.
Note: on some SMP motherboards like MSI 694D the interrupts might
not be generated properly. In such a case, please try to
set the SMP (or MPS) version on BIOS to 1.1 instead of
default value 1.4. Then the interrupt number will be
assigned under 15. You might also upgrade your BIOS.
Setting MPS in the BIOS to 1.1 didn't help. I had to boot the kernel
with "noapic" to get any interrupts from the sound chip. FWIW, the
kernel OSS driver had the same problem.
I finally got some, albeit crappy, sound by unmuting and maxxing out
everything with alsamixer. Strangely, the master volume control had
no effect. It was the headphonoe control, along with PCM and VIA DXS,
which controlled the output volume.
Note: VIA8233/5 (not VIA8233A) can support DXS (direct sound)
channels as the first PCM. With this device, up to 4
streams can be played at the same time. If the playback on
this PCM is noisy, try to specify dxs_channels option to 2
or 3. ^^^^^^^^ support???
To clean up the sound I was getting, I set dxs_support=2 to disable
it, but then I couldn't get any sound at all. Using dxs_support=3 to
lock the frequency at 48kHz, cleaned up the sound but locks up the
driver if anything is played at other than 48kHz.
I am currently using the kernel OSS driver, which at least has clean
sound. However, some of the applications I want to run require ALSA
support so this isn't an acceptable, long-term solution.
Does anyone have any suggestions on what to try, or is the M7VIQ just
a bad choice for on-board sound?
David
--
David Engel
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