TEMPORARY WORKAROUND (Worked for a short time)
I was trying to blacklist the module for the sound card on the GPU by blocking
the module listed in
/proc/asound/modules. Unfortunately all of the cards even the radeon sound card
listed snd-hda-intel as their driver so blacklisting was no option as it would
have killed all my sound.
Fortunately an employee at my university found a workaround:
He used this chain of commands to tell ALSA not to use the radeon audio
device
cat << EOF > /etc/modprobe.d/my-alsa.conf
options snd-hda-intel index=1,2,3 vid=0x8086,0x8086,0x1002
pid=0x9c20,0x9c32,0xaab0
alias snd-sound-slot-2 off
EOF
(or create a file named /etc/modprobe.d/my-alsa.conf and add the towo
lines in the middle)
Sound slot off deactivates the third card (counting starts at 0 therefore slot
2).
You can get the index of your sound cards by executing LANG=C aplay -l which
looks like this for me:
root@HP-EliteBook-850-G1:~# LANG=C aplay -l
**** List of PLAYBACK Hardware Devices ****
card 1: HDMI [HDA Intel HDMI], device 3: HDMI 0 [HDMI 0]
Subdevices: 0/1
Subdevice #0: subdevice #0
card 1: HDMI [HDA Intel HDMI], device 7: HDMI 1 [HDMI 1]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: HDMI [HDA Intel HDMI], device 8: HDMI 2 [HDMI 2]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 2: PCH [HDA Intel PCH], device 0: 92HD91BXX Analog [92HD91BXX Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0
card 3: HDMI_1 [HDA ATI HDMI], device 3: HDMI 0 [HDMI 0]
Subdevices: 0/1
Subdevice #0: subdevice #0
card 3: HDMI_1 [HDA ATI HDMI], device 7: HDMI 1 [HDMI 1]
Subdevices: 1/1
Subdevice #0: subdevice #0
It lists my radeon audio device as card3
After that he told me that the init ram disk has to be rebuilt which he did by
executing this command.
update-initramfs -k all -u
After a reboot my sound works flawlessly now.
As it stands the bug is not fixed but can be avoided this way. The downside is,
that I have no hdmi audio because of that.
EDIT: During me writing this message the sound stopped working again. I
have no idea why.
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1310260
Title:
Pulseaudio fails to detect card (probably due to hybrid graphics)
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