[pulseaudio-tickets] [Bug 83446] New: PulseAudio crash caused by automatic deactivation of dedicated GPU's soundcard via vgaswicheroo

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83446

          Priority: medium
            Bug ID: 83446
                CC: lennart at poettering.net
          Assignee: pulseaudio-bugs at lists.freedesktop.org
           Summary: PulseAudio crash caused by automatic deactivation of
                    dedicated GPU's soundcard via vgaswicheroo
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: paul at konecny.at
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: alsa
           Product: PulseAudio

Hi, 

I'm using a HP EliteBook 850 G1 with Intel HD 4400 / AMD Radeon HD 8750M hybrid
graphics on the mesa drivers respectively. 

After using Pulseaudio with a Linux Kernel version greater than 3.12 the sound
system hangs as it tries to access the dedicated GPU's integrated soundchip
which is deactivated alongside the GPU by the means of run-time power
management (
http://lists.freedesktop.org/archives/dri-devel/2013-September/045650.html )
This feature was enabled by default as of Kernel 3.13. 
It seems that Pulseaudio does not recognize that the soundcard on the radeon is
no longer available and tries to access it, which it can't. 

I already filed a bug at launchpad which can be found here:
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1310260
Four other people are affected but unfortunately Canonical didn't pick up this
bug report. Raymond already did some basic analysis on the logs.

This problem still persists on Arch Linux, with the latest updates applied so I
don't believe it to be a distribution specific problem. 

Dominik on the launchpad bugreport proposed a functioning workaround by
inserting "options snd-hda-intel enable=0,1,0" in /etc/modprobe.d . As this
effectively kills my HDMI Audio it is obviously not an optimal solution. 

If you need anything please let me know. 
I can set up a testing system on a dedicated SSD to tackle this problem. Please
let me know which system you would prefer.
I hope I did everything right as this is my first bug report on
freedeskttop.org

Best regards and thanks in advance!

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