Red Hat Bugzilla – Bug 230804
nVidia MCP55 loses PCM device ALC883 - GA-M59SLI-S5
Last modified: 2007-11-30 17:11:58 EST
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Description of problem:
Building new system using Gigabyte GA-M59SLI-S5 motherboard. During clean install of FC6 (kernel-2.6.18-1.2798) soundcard was detected as
nVidia Corporation MCP55 High Definition Audio
PCM device: ALC833 Analog
Sound played correctly.
When rebooting under kernel-2.6.18-1.2798 PCM device of ALC883 Analog disappears. Reboot several times, each time going thru GNOME dialog to reload sound drivers and about 1 time out of 10 sound comes back, but disappears after next reboot. Upgraded to kernel-2.6.19-1.2911 - same symptoms.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Reload audio drivers in GNOME dialog
2. Reboot system
ALC883 drivers not found. Sound does not function.
ALC883 drivers associated with nVidia MCP55
Sound works normally
A test kernel is at http://people.redhat.com/cebbert
This may fix the problem. Please test.
Thank you. I have updated to kernel-2.6.20-1.2938.fc6 and am still having the
same issue. When I go into sound card detection, I see the card as:
Model: Corporation MCP55 High Definition Audio
However, no device is shown under Device Settings, PCM device. For it to work
it should show ALC883, and it doesn't. Let me know of any other information I
can give to assist in problem determination. Please let me know the specific
commands. Thanks again for your assistance.
Created attachment 151366 [details]
Exact problem also occurs in FC7 TEST 3.
I also have this exact same problem on FC7 final release. I also have the
GA-M59SLI-S5 motherboard. It makes me very sad!! I also have to boot with the
noapic option - could this be causing the problem with sound?
Changing to S7
Found a reference to option "pci=noacpi" tried and it appears to work much
better than using the "noapic" option. The "noapic" option was causing problems
with my soundcard and tvtuner card. I've only been running this way for six
hours but so far so good. Your mileage may vary. It appears the problem with
the motherboard is related to "acpi" and NOT "apic". To make the change either
go into root mode or use sudo, then edit /boot/grub/grub.conf
go to the line which begins with "kernel", and add "pci=noacpi" (without quotes).
My entries now appear as follows:
title Fedora (2.6.21-1.3228.fc7)
kernel /vmlinuz-2.6.21-1.3228.fc7 ro root=LABEL=/ pci=noacpi rhgb quiet
title Fedora (2.6.21-1.3194.fc7)
kernel /vmlinuz-2.6.21-1.3194.fc7 ro root=LABEL=/ pci=noacpi rhgb quiet
I have the same problem, though perhaps less severe (sound loss at 7 of 10
boots), with the Asus M2N-E mainboard and FC6, from the day the system was built
(kernel-2.6.18-1.2798.fc6 or earlier).
I had some luck, maybe, with the "pci=nomsi" option, but just as with the noacpi
and noapci options, the results weren't conclusive or reliably reproducible and
eventually through kernel updates I stopped using any options aside from
"selinux=0" and "vga=791".
Power cycles have a higher percentage of successful sound initialization than do
hardware resets or warm boots. If I had to guess I'd say this smells like a
timing issue at initialization.
On a few occasions sound has disappeared *during* a session, with any attempt to
play music, etc., popping up a failure dialog with "audio is busy" or words to
that effect. The "Generate sound log file /root/scsconfig.log" hasn't been of
any help to me, but I'm not a programmer.
The system is fairly vanilla. I've also had various non-reproducible flakiness
with the onboard ethernet -- can "forcedeth.c" be a *good* thing? -- and have
with colleagues developed a hypothesis that the nVidia MCP-5xx chipsets may not
yet be fully cooked.
Gerald, I still use the noapic option but this soundcard issue seems to have
gone away for me in one of the kernel updates. Perhaps I will try your
pci=nacpi for kicks tonight just to see if it does anything different.
I have been running with the "pci=noacpi" option for several months now with
good results. I just upgraded to kernel 188.8.131.52-65.fc7 and unfortunately, the
system won't boot without it. I'm not sure exactly the reason behind this...
I'm just glad I have found an acceptable work around.
I think I have the same board as you (from your other bug report). I have been
booting with "noapic" - if I remove it, it doesn't boot because of the timer
error. Is there any reason why "pci=noacpi" is a better choice than "noapic" -
I admit that I don't really no what either of these mean.
I would defer to the developers - not sure what is causing the issue. I posted
the circumvention here to assist others who were having the same issue. Appears
to be AMD AM2 related. Google: APIC AM2 LINUX
Created attachment 190811 [details]
I just did a FC7 install (Kernel 184.108.40.206-65.fc7) on my asus M2N-E AM2 mobo,
with ALSA driver 1.0.14, Lib alsa-lib-1.0.14-3.fc7, util
The audio card detected was nvidia MCP55 High Definition Autdio, PCM AD198x
Digital. I get no sound from either digital or analog audio options.
I also have a windows XP sp2 dual boot on the same configuration, and that
same output worked properly (not a hardware issue). I also have a spare sound
blaster live! sound card, and when plugged in, ALSA detected it properly and
everything worked also.
Attached is my scsconfig.log file generated from my 'audio configuration'
I did some additional searches and found that "acpi_use_timer_override" also
fixes the problem and apparently for this particular motherboard is the
workaround of choice and the only option needed. Looks like the problem is because
HPET (high precision event timer) support isn't correctly implemented in the BIOS.
I also found where there is some work going on in to enable HPET support for
motherboards with a broken bios:
Why so many different manufacturers have the same problem is curious - and looks
like it might point back to NVIDIA.
In the meantime, in addition to changing to the above option, I've opened a bug
report with Gigabyte asking them to enable HPET support. Looks like they have
already fixed on the GA-M57SLI-S4 BIOS.
Gigabyte has provided a test BIOS "m59slis5.f8g" which appears to have fixed the
problem. They should be posting on their website; or you can request it
directly from them via their website. I am now able to boot without using the
unfortunately for me, the Asus M2N-E board with the new bios (2007 Jul 09) did
not fix the problem. Again, my windows partition will use both the mobo spdif
and the soundblaster spdif, but on fedora 7 only the soundblaster one works.
Did the bios you installed have HPET support. If so, did you enable...it might
not have come enabled. If that doesn't work, did you try the
"acip_user_time_override" parameter when booting? If none of that works then
looks like you have another problem and should open a new bug report. This bug
report is specific to the Gigabyte GA-M59SLI-S5 motherboard.