On 10-07-08 01:24, Arthur Marsh wrote:
> Hi, I am having trouble getting sound working in an old Compaq Armada
> 1750 with an ESS AudioDrive ES1869.
>
> Even when it's working (verified by aplay some-sound.wav), KDE 3.5.9
> sound doesn't always work )-:.
KDE 3.5.9 uses aRts which, I'm sorry to say, is simply unsalvageable.
> Attached are a working and non-working configurations from alsa-info.sh
The difference would seem to be that your working configuration uses two
8-bit DMA channels (dma1=0, dma2=1) while the non-working one uses a
16-bit channel for dma2 (the playback channel). The driver source indeed
warns that 16-bit DMA appears broken.
It's the Compaq BIOS which tells the driver which resources the card can
use so does it perhaps provide a way to fix the DMA channel(s) to 8-bit
channels (0,1 and 3)?
> What appears to be needed is a way to forcing the sound chip into a
> known working start upon start-up.
>
> Does anyone have any suggestions?
The BIOS route is preferred but if the setup provides nothing useful you
should be able to force the channels by echoing stuff into /sys before
the driver loads.
To test, unload the driver
# modprobe -r snd-es18xx
and do a
# cat /sys/devices/pnp0/00:0c/resources
It should at this point be "state=disabled". Force the DMA channels by
doing:
# echo -n set dma 0 dma 1 > /sys/devices/pnp0/00:0c/resources
and reload the driver:
# modprobe snd-es18xx
Another
# cat /sys/devices/pnp0/00:0c/resources
should now confirm that the chip is using dma channels 0 and 1 and sound
is expected to work.
You're not going to want to do this at each boot and given the 16-bit
DMA channel comment and lack of es18xx hardware that can use DMA by both
author and myself I get the feeling that simply disabling 16-bit DMA
might be the best thing and this might be worth a PnP quirk, certainly
if you can't actually force an 8-bit channel in the BIOS.
Your /sys/devices/pnp0/00:0c/id should say either ES1968 or ES1978.
Which one? Could you also post your /sys/devices/pnp0/00:0c/options?
The contents of /sys/devices/pnp0/00:0c/resources directly at bootup
before the driver has loaded is also interesting. To keep the driver
from loading on a udev system, you probably need to blacklist it
temporarily (add snd-es18xx to /etc/modprobe.d/blacklist).
Rene.
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