[Bug 70301] [IT6506 Display Receiver] DP hotplug fails (display and audio) with i915/kernel 3.11.1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70301

--- Comment #12 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to comment #10)
> (In reply to comment #8)
> > Please try v3.12-rc4 which should have
> > 
> > commit bc86625a4ff7574d4d4dba79723457711eb784e0
> > Author: Chris Wilson <chris at chris-wilson.co.uk>
> > Date:   Sun Jul 21 16:00:03 2013 +0100
> > 
> >     drm/i915: Retry DP aux_ch communications with a different clock after
> > failur
> > 
> > which changes the divider and adds a retry with another divider.
> 
> 1. The DP display issue(which may have to do with aux timeout) was gone with
> commit bc86625a4ff7574d4d4dba79723457711eb784e0 (please see the kernel log
> that I attached to this thread).
> 
> 2. The DP display issue still exists in the commit prior to commit
> bc86625a4ff7574d4d4dba79723457711eb784e0.

Daniel, we need to consider backporting Chris' fix to stable kernels.

> 3. The DP audio issue exists in commit
> bc86625a4ff7574d4d4dba79723457711eb784e0 (no card codec interface was found
> in /proc/asound/)

>From the logs:

[    8.878426] ALSA sound/pci/hda/hda_intel.c:3807 Haswell must build in
CONFIG_SND_HDA_I915
[    8.878428] ALSA sound/pci/hda/hda_intel.c:3836 Error request power-well
from i915

Do you have CONFIG_SND_HDA_I915=y instead of =m?

Also, I'm confused by your dmesg in comment #9 having "Linux version
3.11.0-rc2+" and the line numbers above match that kernel version. Were you
running some frankenstein combination of 3.11-rc2 and 3.12-rc4 or what?

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