[Bug 89589] [dp mst] External displays remain blank with linux-3.18.6 after resuming from suspend

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89589

--- Comment #7 from Daniel Martin <consume.noise at gmail.com> ---
(In reply to Daniel Martin from comment #6)
> Created attachment 115543 [details]
> dmesg drm-intel-nightly 2015y-05m-05d
> 
> I can confirm this bug. It still exists in drm-intel-nightly:
>     b10dc96 drm-intel-nightly: 2015y-05m-05d-07h-49m-44s UTC integration
> manifest
> 
> (I had to revert "drm/i915: Implement the intel_dp_autotest_edid function
> for DP EDID complaince tests", as it caused a compilation failure.)
> 
> I tried raising the retry count in drm_dp_check_act_status(). With that the
> "[drm:drm_dp_check_act_status] failed to get ACT bit 1 after ..." message
> was gone and an extra log message stated that it worked after round about 66
> retries, but the problem with the external monitor remains.

Forgot to mention that you don't need a running X-Server to reproduce the
problem, a plain console is sufficient. That's how the dmesg was created.

And waiting until the console blanks and bringing it back with a key press
re-activates the external monitor too.

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