[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 #6 from Mikael Djurfeldt <mikael at djurfeldt.com> ---
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.

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