[Bug 97991] [i915, Surface Pro 4] Regression: No display port output in kernel 4.8

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97991

--- Comment #7 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Mikael Djurfeldt from comment #6)
> git bisect gives fce91f2 which is about guc.
> 
> I then realized that I had the following line in my i915.conf:
> 
> options i915 enable_guc_submission=Y guc_log_level=3
> 
> When I remove these options, the display port output starts to work also for
> later kernels, such as 4.8.0-rc8, i.e. the problem disappears.
> 
> But this is still a bug, right? It seems strange that DP output disappears
> just because guc is enabled.

[    9.190503] i915: `Y' invalid for parameter `enable_guc_submission'

so looks like it refused to even load the module with the invalid knob in
place. That behaviour is slightly amusing since you can pass non-existing
modparams just fine, but apparently trying to pass an invalid value for a
modparam that does exist is fatal.

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