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: 07-26-2006 02:03 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. ====================================================================== ---------------------------------------------------------------------- bitmage2 - 07-25-06 21:53 ---------------------------------------------------------------------- I have tested and can run multiple instances of all three commands (means: also the "-Drear" one works) without commenting out the "lock". It also works if I comment out the "lock" in the "CS46xx.pcm.rear.0" section of /usr/share/alsa/cards/CS46xx.conf . After testing further I have good news and bad news: The good news: "speaker-test -c 6 -Dsurround51 -t wav" does not go to 100% CPU load when removing the "lock". :-) So far - so good. But my original stated goal was: "use the rest of my 5.1 speaker set". And this goal includes playing back 2-channel MP3 files on all 6 speakers. So here's the bad news: I created a .asoundrc with a channel duplicator "pcm.ch51dup" or "pcm.duplicate" (see below. I found those on the internet). Using any of those two, the CPU goes again to 100% (Example: "speaker-test -Dch51dup -c 2 -t wav"). Christian --- ~/.asoundrc --------------------------- pcm.ch51dup { type route slave.pcm "surround51" slave.channels 6 ttable.0.0 1 ttable.1.1 1 ttable.0.2 1 ttable.1.3 1 ttable.0.4 0.5 ttable.1.4 0.5 ttable.0.5 0.5 ttable.1.5 0.5 } --- Alternative ~/.asoundrc --------------------------- pcm.duplicate { type plug slave.pcm "surround51" slave.channels 6 route_policy duplicate } ---------------------------------------------------------------------- Raymond - 07-26-06 02:03 ---------------------------------------------------------------------- How many instances of surround40 or surround51 can you run ? It hard to notice 'out of sync' when using speaker-test You may try the upmix plugin in alsa-plugins-1.0.12rc1 for up-mixing 2 channels to 6 channels. 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 07-24-06 04:19 Raymond Note Added: 0011209 07-24-06 05:04 Raymond Note Edited: 0011209 07-24-06 20:38 bitmage2 Note Added: 0011214 07-25-06 03:00 Raymond Note Added: 0011223 07-25-06 03:03 Raymond Note Edited: 0011223 07-25-06 03:05 Raymond Note Edited: 0011223 07-25-06 10:05 Raymond Note Edited: 0011223 07-25-06 10:13 Raymond Note Edited: 0011223 07-25-06 21:53 bitmage2 Note Added: 0011232 07-26-06 02:03 Raymond Note Added: 0011235 ====================================================================== ------------------------------------------------------------------------- Take Surveys. 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