Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: pulseaudio (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1210470

Title:
  Switching to integrated card with vgaswitcheroo makes the kernel to
  hang, until pulseaudio is killed

Status in The Linux Kernel:
  Confirmed
Status in “pulseaudio” package in Ubuntu:
  Confirmed

Bug description:
  I have a dual-GPU notebook, with a Intel Ironlake integrated GPU and a
  AMD 5650m dedicated GPU (muxed system). The AMD gpu is also connected
  to an HDMI port that implies an audio card (I'm running radeon module
  with radeon.audio=1).

  If I switch to the integrated card after that the UI is up and
  pulseaudio is loaded, as soon as I exit from lightdm (both to reload X
  or to shutdown the PC) the kernel hangs (both in 12.10, 13.04 and
  13.10):

  [ 489.177732] hda-intel 0000:01:00.1: Disabling via VGA-switcheroo
  [ 489.297129] hda-intel 0000:01:00.1: Cannot lock devices!
  [ 489.297139] radeon: switched off
  [ 489.300356] [drm] Disabling audio support
  [ 489.319552] radeon 0000:01:00.0: fence driver on ring 5 use gpu addr 
0x000000000015e418 and cpu addr 0xffffc90009df0418
  [ 489.973886] ACPI: \_SB_.PCI0: ACPI_NOTIFY_BUS_CHECK event: unsupported
  [ 489.973903] _handle_hotplug_event_root: Bus check notify on \_SB_.PCI0
  [ 678.992375] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 
5secs aborting
  [ 678.992453] [drm:atom_execute_table_locked] *ERROR* atombios stuck 
executing CD0C (len 62, WS 0, PS 0) @ 0xCD28
  [ 683.996303] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 
5secs aborting
  [ 683.996377] [drm:atom_execute_table_locked] *ERROR* atombios stuck 
executing CD0C (len 62, WS 0, PS 0) @ 0xCD28
  [ 683.996453] [drm:atom_execute_table_locked] *ERROR* atombios stuck 
executing C3DC (len 871, WS 0, PS 0) @ 0xC439
  [ 689.000275] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 
5secs aborting
  [ 689.000349] [drm:atom_execute_table_locked] *ERROR* atombios stuck 
executing CD0C (len 62, WS 0, PS 0) @ 0xCD28
  [ 694.004285] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 
5secs aborting
  [ 694.004363] [drm:atom_execute_table_locked] *ERROR* atombios stuck 
executing CD0C (len 62, WS 0, PS 0) @ 0xCD28
  [ 699.008330] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 
5secs aborting
  [ 699.008414] [drm:atom_execute_table_locked] *ERROR* atombios stuck 
executing CD0C (len 62, WS 0, PS 0) @ 0xCD28
  [ 699.514458] init: tty1 main process (2460) killed by QUIT signal
  [ 699.514489] init: tty1 main process ended, respawning
  [ 704.012405] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 
5secs aborting
  [ 704.012492] [drm:atom_execute_table_locked] *ERROR* atombios stuck 
executing CD0C (len 62, WS 0, PS 0) @ 0xCD28
  [ 709.016515] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 
5secs aborting
  [ 709.016596] [drm:atom_execute_table_locked] *ERROR* atombios stuck 
executing CD0C (len 62, WS 0, PS 0) @ 0xCD28

  
  At the contrary, if once lightdm starts I go to tty1 → sudo service lighdm 
stop → sudo killall pulseaudio → echo OFF| sudo tee 
/sys/kernel/debug/vgaswitcheroo/switch #switch to integrated card

  Everything works well instead.

  So it seems that pulseaudio should disable the powered-off card on
  switch (or is this something that the kernel should do?).

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