[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 #14 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to comment #13)
> (In reply to comment #12)
> > (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?
> >
> 
> => Sorry, tt might be my mistake to use the incorrect kernel configuration.
> I will update it later.
> 
>  
> > 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?
> 
> => I used git reset --hard bc86625a4ff7574d4d4dba79723457711eb784e0 (VERSION
> = 3, PATCHLEVEL = 11, SUBLEVEL = 0 EXTRAVERSION = -rc2 in Makefile)

That doesn't do what you think it does. Use git checkout.

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