Bug 100281 - CPU suspend & audio (alsa|pulseaudio) conflict
Summary: CPU suspend & audio (alsa|pulseaudio) conflict
Status: NEW
Alias: None
Product: Drivers
Classification: Unclassified
Component: Sound(ALSA) (show other bugs)
Hardware: x86-64 Linux
: P1 normal
Assignee: Jaroslav Kysela
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2015-06-22 01:54 UTC by FJLOMACTEP
Modified: 2015-07-06 15:20 UTC (History)
2 users (show)

See Also:
Kernel Version: 3.19.0-21-generic
Subsystem:
Regression: No
Bisected commit-id:

Attachments
Add an attachment (proposed patch, testcase, etc.)

Description FJLOMACTEP 2015-06-22 01:54:26 UTC 
When not touching mouse and keyboard audio stuttering appears. Stuttering appears when CPU load become slow down. In task manager i have seen normal cpu load approx 20-30 % and 3% when audio stuttering comes. When did not touch keyboard and mouse audio stuttering appears at 4 or 8 or 2 sec. and continues 4 - 5 sec. and this effect looping.

Sound cards recognized by the system:
00:07.0 Audio device [0403]: NVIDIA Corporation MCP72XE/MCP72P/MCP78U/MCP78S High Definition Audio [10de:0774] (rev a1)
Sound cards recognized by ALSA:
00:07.0 Audio device [0403]: NVIDIA Corporation MCP72XE/MCP72P/MCP78U/MCP78S High Definition Audio [10de:0774] (rev a1)
Sound cards recognized by ALSA, and activated:
00:07.0 Audio device [0403]: NVIDIA Corporation MCP72XE/MCP72P/MCP78U/MCP78S High Definition Audio [10de:0774] (rev a1)

00-00: ALC662 rev1 Analog : ALC662 rev1 Analog : playback 1 : capture 1
00-01: ALC662 rev1 Digital : ALC662 rev1 Digital : playback 1
00-02: ALC662 rev1 Alt Analog : ALC662 rev1 Alt Analog : capture 1
00-03: HDMI 0 : HDMI 0 : playback 1
   
alsactl version 1.0.29 or 1.0.28 - same effect.

3.19.0-21-generic #21-Ubuntu SMP Sun Jun 14 18:31:11 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux 

dmesg --level=err,warn: http://paste.debian.net/250409/
lspci                   http://paste.debian.net/250778/
lspci -v                http://paste.debian.net/250779/
Comment 1 FJLOMACTEP 2015-06-22 02:46:02 UTC 
Sorry, but same stuttering appears and in 3.19.0-15-generic, that i have not founded before updates. I don't know where from that bug comes.
Comment 2 FJLOMACTEP 2015-06-22 03:23:56 UTC 
Am not sure, but posible it is "xfce4 power manager" bug. Sorry for mistake.
Comment 3 FJLOMACTEP 2015-06-22 03:57:45 UTC 
It is not xfce power manager. I don't know what it is ;(
Comment 4 FJLOMACTEP 2015-06-22 05:33:16 UTC 
When go in suspend and back audio stuttering bug disappeared.
Comment 5 FJLOMACTEP 2015-06-22 15:19:46 UTC 
Audio stuttering appears only when CPU load very small. If there are some task taking busy CPU there are no problems.
Comment 6 Aaron Lu 2015-07-06 02:27:32 UTC 
Probably we should let the audio people take a look, move there.
Comment 7 Takashi Iwai 2015-07-06 15:20:44 UTC 
Are you using PulseAudio?  If yes, does the behavior happen without PA?  Or after changing the PA setup not to use tsched?
Note You need to log in before you can comment on or make changes to this bug.