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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [dp mst] External displays remain blank with linux-3.18.6 after resuming from suspend"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89589#c7">Comment # 7</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [dp mst] External displays remain blank with linux-3.18.6 after resuming from suspend"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89589">bug 89589</a>
from <span class="vcard"><a class="email" href="mailto:consume.noise@gmail.com" title="Daniel Martin <consume.noise@gmail.com>"> <span class="fn">Daniel Martin</span></a>
</span></b>
<pre>(In reply to Daniel Martin from <a href="show_bug.cgi?id=89589#c6">comment #6</a>)
<span class="quote">> Created <span class=""><a href="attachment.cgi?id=115543" name="attach_115543" title="dmesg drm-intel-nightly 2015y-05m-05d">attachment 115543</a> <a href="attachment.cgi?id=115543&action=edit" title="dmesg drm-intel-nightly 2015y-05m-05d">[details]</a></span>
> 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.</span >
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.</pre>
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