Good morning (at least from my timezone),
I'm facing problems setting up my sound properly on my Sony Vaio
notebook. When using CPU throttling with programs like cpufreq[1] or
cpudynd [2], the sound breaks after a short period, mostly when on low
CPU usage. "Breaks" in this case means noisy sound and quirks.
If I do not use dynamic CPU throttling, Alsa behaves well and doesn't
have any problems.
Is this a known problem with Alsa, Kernel 2.6.x and dynamic CPU
throttling in general? Are there ways yet to have both running at the
same time?
Some notes on my system:
Gentoo GNU/Linux with kernel 2.6.x (2.6.3 at the moment)
- The problem occurs both with patches gentoo-dev-sources as well
as with vanilla kernel sources.
My soundcard, refering to 'lspci -v':
- 0000:00:1f.5 Multimedia audio controller:
Intel Corp. 82801CA/CAM AC'97 Audio Controller (rev 02)
Subsystem: Sony Corporation: Unknown device 80fa
Flags: bus master, medium devsel, latency 0, IRQ 9
I/O ports at 1c00
I/O ports at 18c0 [size=64]
The relevant output of 'dmesg':
- Advanced Linux Sound Architecture Driver Version 1.0.2c.
PCI: Setting latency timer of device 0000:00:1f.5 to 64
ALSA sound/pci/ac97/ac97_codec.c:1861:
MC'97 1 converters and GPIO not ready (0xff00)
intel8x0_measure_ac97_clock: measured 49292 usecs
intel8x0: clocking to 48000
ALSA device list:
#0: Intel 82801CA-ICH3 at 0x1c00, irq 9
- You can view the whole 'dmesg' output here:
http://basquiat.homeunix.org/vaio_dmesg.txt
Some Information from /proc/asound:
/proc/asound/cards:
0 [I82801CAICH3 ]: ICH - Intel 82801CA-ICH3
Intel 82801CA-ICH3 at 0x1c00, irq 9
/proc/asound/version:
Advanced Linux Sound Architecture
Driver Version 1.0.2c
(Thu Feb 05 15:41:49 2004 UTC).
Compiled on Feb 23 2004 for kernel 2.6.3-gentoo-r1.
/proc/asound/timers
G0: system timer : 1000.000us (10000000 ticks)
G1: RTC timer : 976.562us (100000000 ticks)
P0-0-0: PCM playback 0-0-0 : SLAVE
P0-0-1: PCM capture 0-0-1 : SLAVE
P0-1-1: PCM capture 0-1-1 : SLAVE
My kernel .config can be seen here, if of any interest:
- http://basquiat.homeunix.org/vaio_kernel.txt
I hope this email isn't too verbose.
Regards,
Jens
Footnotes:
----------
[1] http://sourceforge.net/projects/cpufreqd
[2] http://mnm.uib.es/~gallir/cpudyn/
--
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