A NOTE has been added to this issue. ====================================================================== <https://bugtrack.alsa-project.org/alsa-bug/view.php?id=1869> ====================================================================== Reported By: bitmage2 Assigned To: ====================================================================== Project: ALSA - driver Issue ID: 1869 Category: CORE - pcm Reproducibility: always Severity: minor Priority: normal Status: new Distribution: SuSE Linux 10.0 Kernel Version: Linux 2.6.13-15.8-default #1 Tue Feb 7 11:07:24 UTC 2006 i686 athlon i386 GNU/Linux ====================================================================== Date Submitted: 02-23-2006 00:48 CET Last Modified: 07-23-2006 15:04 CEST ====================================================================== Summary: Playing surround sound produces 100% CPU load Description: I am using the CS46xx with a Hercules Gametheater XP 5.1 . It plays back stereo without problems. I wanted to use the rest of my 5.1 speaker set, so for a test I ran the speaker-test program. Running it without parameters or with 2 or 4.0 channels works also fine. So far so good. But when I run it with 5.0 channels or 5.1 channels the CPU load of speaker-test goes to 100%. I'll show the output of top along with the command lines below (for the 2.0 and 5.1 case) in the "Additional Information" box. ====================================================================== ---------------------------------------------------------------------- Raymond - 07-23-06 13:49 ---------------------------------------------------------------------- Please update alsa-utils to the same version of alsa-lib speaker-test -c 2 -t wav speaker-test -c 4 -Dsurround40 -t wav speaker-test -c 6 -Dsurround51 -t wav ---------------------------------------------------------------------- bitmage2 - 07-23-06 15:04 ---------------------------------------------------------------------- The installed RPM package "alsa" is 1.0.9-23.2 (includes alsa-lib , alsa-utils , alsa-conf and libasound. This means alsa-lib and alsa-utils should be the same version. If it helps, I can install alsa 1.0.12rc1 now on a clean Linux installtion. Should I do so? About the test cases: speaker-test -c 2 -t wav # Does not produce high load speaker-test -c 4 -Dsurround40 -t wav # Produces high load speaker-test -c 6 -Dsurround51 -t wav # Produces high load While playing around I made an interesting observation: The two probleamtic cases do not produce high load, if the machine is otherwise *completely* idle (means: don't move the mouse). If I start some activity (for example starting Firefox, use a file manager or execute something like "cat /boot/vmlinuz"), speaker-test immediately goes to 100% CPU time. In this case often a "Broken pipe" can be observed (see below). "speaker-test -c 2 -t wav" always works, no matter how hard I stress the machine. chris@bjork:~> speaker-test -c 6 -Dsurround51 -t wav speaker-test 0.0.8 Playback device is surround51 Stream parameters are 48000Hz, S16_LE, 6 channels Using 16 octaves of pink noise Rate set to 48000Hz (requested 48000Hz) Buffer size range from 16 to 16384 Period size range from 8 to 512 Periods = 4 Buffer time size 2525 To choose buffer_size = 16384 To choose period_size = 4096 was set period_size = 512 was set buffer_size = 16384 0 - Front Left 4 - Center 1 - Front Right 3 - Rear Right Write error: -32,Broken pipe 2 - Rear Left 5 - LFE Issue History Date Modified Username Field Change ====================================================================== 02-23-06 00:48 bitmage2 New Issue 02-23-06 00:48 bitmage2 Distribution => SuSE Linux 10.0 02-23-06 00:48 bitmage2 Kernel Version => Linux 2.6.13-15.8-default #1 Tue Feb 7 11:07:24 UTC 2006 i686 athlon i386 GNU/Linux 02-23-06 00:54 bitmage2 Note Added: 0008164 02-23-06 00:55 bitmage2 Issue Monitored: bitmage2 07-11-06 05:58 Raymond Note Added: 0010964 07-14-06 20:57 bitmage2 Note Added: 0011004 07-14-06 20:59 bitmage2 Note Added: 0011005 07-14-06 21:25 rlrevell Note Added: 0011006 07-14-06 22:40 bitmage2 Note Added: 0011008 07-14-06 22:57 rlrevell Note Added: 0011009 07-15-06 01:28 bitmage2 Note Added: 0011013 07-15-06 01:45 rlrevell Note Added: 0011014 07-15-06 05:09 Raymond Note Added: 0011017 07-15-06 07:17 Raymond Note Edited: 0011017 07-23-06 11:34 bitmage2 Note Added: 0011183 07-23-06 13:49 Raymond Note Added: 0011185 07-23-06 14:14 Raymond Note Added: 0011186 07-23-06 14:16 Raymond Note Deleted: 0011186 07-23-06 15:04 bitmage2 Note Added: 0011189 ====================================================================== ------------------------------------------------------------------------- Take Surveys. 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