[Bug 89589] 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

Imre Deak <imre.deak at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |airlied at freedesktop.org,
                   |                            |imre.deak at intel.com

--- Comment #4 from Imre Deak <imre.deak at intel.com> ---
I see two MST streams being restored during resume. The only issue I can spot
in the modeset for these is:

[   50.162397] [drm:drm_dp_mst_allocate_vcpi] initing vcpi for 532 14
[   50.162997] [drm:intel_mst_enable_dp] 1
[   50.176764] [drm:drm_dp_check_act_status] failed to get ACT bit 1 after 30
retries
[   50.176765] [drm:drm_dp_update_payload_part2] payload 0 1

and

[   50.218921] [drm:intel_mst_pre_enable_dp] 1
[   50.218922] [drm:drm_dp_mst_allocate_vcpi] initing vcpi for 387 10
[   50.219535] [drm:intel_mst_enable_dp] 2
[   50.233404] [drm:drm_dp_check_act_status] failed to get ACT bit 1 after 30
retries
[   50.233405] [drm:drm_dp_update_payload_part2] payload 0 2
[   50.233405] [drm:drm_dp_update_payload_part2] payload 1 1

Adding Dave. Any idea?

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