I use MacBook pro with Fedora 8, Windows XP, Mac OS X Leopard. When i run music
player under fedora i can hear noise from left speaker. that noise look like
damaged speaker, with hole in membrane or water. That never happens on Windows
or OS X with any kind of music and that look like bug in alsa or music codec.
To reach that effect you can run any sound or test. For example you can hear a
abnormal hard sounds (from left speaker only) when you run aplay
that happens with: last.fm client, flash10 beta (youtube.com).
never happens: amarok.
That happens time to time. Killing X by Alt+Ctl+Backspace few times can solve problem.
Noise come from left speaker independ i use my notebook speakers or headphones.
It looks like a PCI DMA timing related problem. It would be probably difficult to solve it.
look like it solved in 2.6.27 build. i continue playing with development kernel...
happens again. just not all time reproducible.
suspend/resume can temporally fix this issue (until next boot).
This problem also happens on latest x86_64 Fedora 11 with 22.214.171.124-217.2.3.fc11.x86_64 kernel. I have also upgraded alsa-drivers to 1.0.20, but the problem remains.
The board is stock Intel D975XBX .
Before upgrading to F11, there was no static on the left channel, but when alsa kernel drivers were upgraded to 1.0.20, static is always heard on left channel (i.e. I was not able to "fix" the problem by rebooting computer).
Since PCI timings are suspected, here is output for HDA PCI device:
00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 01)
Subsystem: Intel Corporation Device 0417
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 22
Region 0: Memory at e0400000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: HDA Intel
Kernel modules: snd-hda-intel
Info, generated from alsa-info.sh will be attached in the next message.
FYI, the same bug is reported on Ubuntu  and is already tracked at ALSA development site . Since the problem happens in F11 all the time, I think that the severity of this bug should be raised. This bug is really (__REALLY__!) annoying, it effectively strips "HD" from HDA ;)
Perhaps some additional info is hidden in the output of "alsactl init 0":
Unknown hardware: "HDA-Intel" "SigmaTel STAC9221D A2" "HDA:83847683,80860417,00103201" "0x8086" "0x0417"
Hardware is initialized using a guess method
BTW: The sound works without _ANY_ problem in WindowsXP.
(I can provide furhter info / debug on request. Also, I can change and recompile drivers if this will help. IMO, PCI protocol analyser is of little use in this case ...)
Created attachment 356637 [details]
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