Description of problem:
I hear too often choppy sound, like the soundcard is often turn on and off or something (I used to hear this sound when the kernel boots in previous releases)
Version-Release number of selected component (if applicable):
Linux pavilion 188.8.131.52-43.fc11.i586 #1 SMP Thu Aug 27 21:18:54 EDT 2009 i686 i686 i386 GNU/Linux
Steps to Reproduce:
2. log into KDE
3. use the system for some time period
4. hear the choppy noise here and there (it takes just second or so..)
No choppy sound at all. Like in kernel 2.6.29 series.
rpm -q pulseaudio
lspci | grep -i audio
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)
I can reproduce this on my machine with the Fedora 12 beta. It seems to be triggered by opening the sound device, with a second click a few seconds later, and is caused by leaving/entering powersaving mode.
It can be prevented with this command:
$ echo 0 > /sys/module/snd_hda_intel/parameters/power_save
HDA Intel 0000:00:1b.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
HDA Intel 0000:00:1b.0: setting latency timer to 64
hda_codec: Unknown model for ALC882, trying auto-probe from BIOS...
ALSA sound/pci/hda/hda_codec.c:3862: autoconfig: line_outs=4 (0x14/0x15/0x16/0x17/0x0)
ALSA sound/pci/hda/hda_codec.c:3866: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
ALSA sound/pci/hda/hda_codec.c:3870: hp_outs=1 (0x1b/0x0/0x0/0x0/0x0)
ALSA sound/pci/hda/hda_codec.c:3871: mono: mono_out=0x0
ALSA sound/pci/hda/hda_codec.c:3874: dig-out=0x1e/0x0
ALSA sound/pci/hda/hda_codec.c:3882: inputs: mic=0x18, fmic=0x19, line=0x1a, fline=0x0, cd=0x0, aux=0x0
ALSA sound/pci/hda/hda_codec.c:3884: dig-in=0x1f
ALSA sound/pci/hda/patch_realtek.c:1197: realtek: Enabling init ASM_ID=0xe601 CODEC_ID=10ec0882
input: HDA Digital PCBeep as /devices/pci0000:00/0000:00:1b.0/input/input5
$ lspci | grep -i audio
00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 02)
$ rpm -q kernel
Expected behaviour is that the clicking does not occur. If this is a hardware problem it would be good if the hardware was blacklisted
I am CONFIDENT after about an hour and a half of googling that the problem is caused by Fedora 12's new audio "power save" function. What the function does is turn off your sound device after 10 seconds without any audio playing. This power save function really does not save much power at all, according to everybody on the entire internet... And Intel HDA audio devices produce a pop sound each time it is turned off or on in ALSA. This explains the problem. I have it too.
In Ubuntu, the option to enable it is located in /etc/modprobe.d/alsa-base.conf, and it is enabled by default. You can just comment out the last line (#options snd-hda-intel power_save=10) to fix it.
But in Fedora, there is no alsa-base.conf. We know exactly what to do to fix this problem; we just don't know how to fix it.
(In reply to comment #2)
> I am CONFIDENT after about an hour and a half of googling that the problem is
> caused by Fedora 12's new audio "power save" function. What the function does
> is turn off your sound device after 10 seconds without any audio playing. This
> power save function really does not save much power at all, according to
> everybody on the entire internet... And Intel HDA audio devices produce a pop
> sound each time it is turned off or on in ALSA. This explains the problem. I
> have it too.
> In Ubuntu, the option to enable it is located in
> /etc/modprobe.d/alsa-base.conf, and it is enabled by default. You can just
> comment out the last line (#options snd-hda-intel power_save=10) to fix it.
> But in Fedora, there is no alsa-base.conf. We know exactly what to do to fix
> this problem; we just don't know how to fix it.
EDIT: Hehe, sorry cb-rhbugz, I just scrolled right past your comment. What you mentioned worked. There really does need to be a blacklist. Either that or make the audio fade out to 0 volume before turning off the device and fade back in for turning it back on, assuming that would work.
There is a discussion about disabling HDA power saving in bug 527286.
Lukas, does disabling power_save help in your case too?
Thanks for the link, Michal
In my case, running:
echo 0 > /sys/module/snd_hda_intel/parameters/power_save
Disabled power save for the current user's session only. Restarting the computer resets that option back to 5 and hence turns on power_save again.
echo "options snd_hda_intel power_save=0" > /etc/modprobe.d/snd_hda_intel.conf
Actually turned it off for real.
And I'd like to mention one more thing: a problem in Fedora 12 is that the Mute button of my HP dv6227cl laptop would not light up when the sound was muted (though the button still worked to mute/unmute the audio).
echo "options snd_hda_intel model=hp-dv6" >> /etc/modprobe.d/snd_hda_intel.conf
Actually fixed that. Fedora 11 never had the problem. I think some old code could be merged in F12 so that its audio device detection works more accurately.
(In reply to comment #5)
> And I'd like to mention one more thing: a problem in Fedora 12 is that the Mute
> button of my HP dv6227cl laptop would not light up when the sound was muted
> (though the button still worked to mute/unmute the audio).
> echo "options snd_hda_intel model=hp-dv6" >> /etc/modprobe.d/snd_hda_intel.conf
> Actually fixed that. Fedora 11 never had the problem. I think some old code
> could be merged in F12 so that its audio device detection works more
Drew, please report this as a separate bug and attach the result of "alsa-info.sh --no-upload" to it. Thanks.
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This bug still produce some request for needsinfo, I don't have the problem anymore.