[Bug 64891] [snd_hda_codec] BUG: soft lockup - CPU#0 stuck for 22s (when using vgaswitcheroo)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=64891

Joaquín Aramendía <samsagax at gmail.com> changed:

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--- Comment #30 from Joaquín Aramendía <samsagax at gmail.com> ---
Created attachment 120321
  --> https://bugzilla.kernel.org/attachment.cgi?id=120321&action=edit
dmesg after ACPIPHP patch

A follow-up on this issue:

After applying Rafael's patch, the issue with the lockup is still present.
After booting on 3.13rc5 kernel in 'multi-user.target' I managed to get a full
dmesg.

The nouveau driver seems not to handle vgaswitcheroo well. After being disabled
as DSM call mismatch error suggest, it will lock, after a minute or so it
starts printing this messages:

...
[  123.322051] smeagol kernel: nouveau W[   PFIFO][0000:01:00.0] unknown intr
0x04200000, ch 2
...

Followed by timeout errors:

...
[  129.302814] smeagol kernel: nouveau E[   PFIFO][0000:01:00.0] channel 2
[DRM] unload timeout
...
[  149.888549] smeagol kernel: nouveau W[  BARCTL][0000:01:00.0] flush timeout
...

When the laptop finally responded to Ctrl+Alt+Del then a backtrace appeared
regarding acpi hotplug.

And then nouveau is reloaded again! Just before I had to drown my laptop with
the power button.

...
[  207.138410] smeagol kernel: nouveau  [  DEVICE][0000:01:00.0] BOOT0  :
0x0a8a80b1
[  207.138415] smeagol kernel: nouveau  [  DEVICE][0000:01:00.0] Chipset: GT218
(NVA8)
[  207.138418] smeagol kernel: nouveau  [  DEVICE][0000:01:00.0] Family : NV50
[  207.139892] smeagol kernel: nouveau  [   VBIOS][0000:01:00.0] checking
PRAMIN for image...
[  207.188025] smeagol kernel: nouveau  [   VBIOS][0000:01:00.0] ... signature
not found
[  207.188030] smeagol kernel: nouveau  [   VBIOS][0000:01:00.0] checking PROM
for image...
[  208.466903] smeagol kernel: nouveau  [   VBIOS][0000:01:00.0] ... signature
not found
[  208.466907] smeagol kernel: nouveau  [   VBIOS][0000:01:00.0] checking ACPI
for image...

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