[Bug 84265] [BSW Bisected]System fails to find eDP monitor.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84265

Ville Syrjala <ville.syrjala at linux.intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |NEEDINFO

--- Comment #7 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to comment #5)
> (In reply to comment #2)
> > (In reply to comment #1)
> > > Have you perhaps upgraded the BIOS on the machine recently?
> > 
> Both BIOS V35 and V36 fail to detect eDP.
> > That's my question as well. I had another report of eDP going missing on one
> > machine and there the HDMIC/DP_C registers report the port as not detected.
> > My own RVP board with the latest BIOS seems to work just fine however.
> > 
> > What does this say on the failing machine?
> >  intel_reg_read 0x1e1140 0x1e1160 0x1e116c 0x1e4100 0x1e4200 0x1e4300
> 
> root at x-bsw02:~# intel_reg_read 0x1e1140 0x1e1160 0x1e116c 0x1e4100 0x1e4200
> 0x1e4300
> 0x1E1140 : 0x81C
> 0x1E1160 : 0x1A
> 0x1E116C : 0x82000B5E
> 0x1E4100 : 0x1C
> 0x1E4200 : 0xA0010018
> 0x1E4300 : 0x1C

And what do you get if you run intel_reg_read before loading i915.ko?

The detect bits seem to be read-only on my BSW at least so this seems like a
board/BIOS issue. And that makes the the bisect result really unexpected.

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