[Bug 92685] [i915 Skylake] HDMI output does not work

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92685

--- Comment #7 from ebiggers3 at gmail.com ---
I updated the bug title to reflect the fact that the HDMI output not working
(because of the invalid EDID checksum) is now the only problem for me.  So
there must have been two separate problems originally, one of which was solved
by the 4.4 merges.

I tried hacking the i915 driver code in a few different ways but none of them
solved the problem:

- always setting force_bit=1 on the 'struct intel_gmbus'
- changing the drm_i915_private hotplug_work to a delayed_work and scheduling
it with delay 400 ms
- increasing the number of retries in drm_do_get_edid() from 4 to 32
- increasing the number of retries of the "live status" check in
intel_hdmi_detect() from 3 to 30

Also, I verified that the same monitor and VGA->HDMI adapter works on a
Raspberry Pi.  So that leaves the Skylake hardware and/or the i915 driver as
the source of the problem.

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