Public bug reported:
Binary package hint: alsa-base
I'm running here Ubuntu Intrepid Beta with all the latest updates
installed. I noticed that audio applications create a significant load
while playing sound. I've got a FSC Lifebook S-6120, which is using the
snd_intel8x0 module to play sounds. When i play a simple mp3 song with
Rhythmbox or Quod Libet, these programs cause about 25% usage of my
cpu...
$ top
top - 21:43:42 up 4:11, 2 users, load average: 0.57, 0.53, 0.69
Tasks: 134 total, 2 running, 132 sleeping, 0 stopped, 0 zombie
Cpu(s): 34.5%us, 1.6%sy, 0.0%ni, 63.5%id, 0.0%wa, 0.0%hi, 0.3%si, 0.0%st
Mem: 1024312k total, 1006572k used, 17740k free, 37728k buffers
Swap: 3071992k total, 1960k used, 3070032k free, 481680k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
20565 me 20 0 137m 44m 21m S 25.4 4.4 0:27.60 rhythmbox
5833 root 20 0 56312 36m 10m R 4.6 3.6 37:02.45 Xorg
13299 me 20 0 102m 25m 13m S 1.6 2.5 4:24.85 gnome-terminal
[...]
This makes the fan of my laptop spin, causing quite a nouise... When i
compare this to Ubuntu Hardy Heron i had about 2-3% load of my audio
player and about 20% load of pulseaudio (which i usually deactivate). So
playing music caused nearly zero load... The load issue doesn't change,
when i set all my audio devices to ALSA in Intrepid
$ lspci | grep Audio
00:1f.5 Multimedia audio controller: Intel Corporation 82801DB/DBL/DBM
(ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller (rev 03)
$ uname -ar
Linux stein 2.6.27-4-generic #1 SMP Wed Sep 24 01:30:51 UTC 2008 i686 GNU/Linux
** Affects: alsa-driver (Ubuntu)
Importance: Undecided
Status: New
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High load during audio playback
https://bugs.launchpad.net/bugs/277243
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