apm suspend breaks ALSA
Greetings,
I have a laptop with the es1978 ALSA sound driver built into the kernel. When I go through a suspend / resume cycle using apm, the sound system does not recover and loud static comes from the speakers instead of music / voice / etc. On boot, ALSA works just fine.
One solution appears to be building ALSA as modules and unloading / reloading them, after a suspend / resume cycle. With 2.4.xx and the OSS drivers built in, this wasn't an issue.
Now that I've got them built as modules and have a 'sound' script in /etc/apm/events.d/ that does the loading and unloading I'm happy, but I figured I'd report the issue anyway.
Chris
Signature · 3 lines
Christopher S. Swingley email: [email protected] IARC -- Frontier Program Please use encryption. GPG key at: University of Alaska Fairbanks www.frontier.iarc.uaf.edu/~cswingle/
At Wed, 30 Jul 2003 07:12:19 -0800,
Quoted 8 lines · Christopher Swingley
Greetings,
I have a laptop with the es1978 ALSA sound driver built into the kernel. When I go through a suspend / resume cycle using apm, the sound system does not recover and loud static comes from the speakers instead of music / voice / etc. On boot, ALSA works just fine.
Quoted 7 lines
One solution appears to be building ALSA as modules and unloading / reloading them, after a suspend / resume cycle. With 2.4.xx and the OSS drivers built in, this wasn't an issue.
Now that I've got them built as modules and have a 'sound' script in
/etc/apm/events.d/that does the loading and unloading I'm happy, but I figured I'd report the issue anyway.
as default, the power-management of es1968 is enabled only on a certain board, namely,
ESS1978 _and_ (vendor == 0x1028 || vendor == 0x1179)
first, please check whether your pci id matches with it.
the behavior can be changed by a module option, use_pm, but it's missing in the kernel boot parameter (i'll fix this later). in that case, modify use_pm[] default value from 2 to 1, to force to use power-management.
Takashi