Bug 75857

Summary: [regression BYT] DP training failure after DPMS
Product: DRI Reporter: Jesse Barnes <jbarnes>
Component: DRM/IntelAssignee: Jesse Barnes <jbarnes>
Status: CLOSED FIXED QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: highest CC: intel-gfx-bugs
Version: unspecified   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: i915 features:

Description Jesse Barnes 2014-03-06 23:44:00 UTC 
Just noticed this when I updated my branch and tried to unblank the display on my Bayley Bay platform.  dmesg says:

[  626.549976] [drm:intel_dp_complete_link_train] *ERROR* failed to update link training

I already tried reverting the vdd force change, no help there.  Maybe the fast & wide commit?
Comment 1 Imre Deak 2014-03-10 14:44:21 UTC 
Did you try i915.power_well_disable=0 ? That support just went in and has an effect on the unblank path..
Comment 2 Jani Nikula 2014-03-14 13:16:28 UTC 
Jesse, please try with
http://mid.gmane.org/1394233524-3522-3-git-send-email-przanoni@gmail.com

And obviously without the fast & wide one too.
Comment 3 Jani Nikula 2014-04-10 12:45:35 UTC 
Jesse, is this still an issue?
Comment 4 Daniel Vetter 2014-04-11 13:14:06 UTC 
I think Jesse has patches for byt DP failures ...
Comment 5 Jesse Barnes 2014-06-05 20:48:21 UTC 
No longer an issue, even after we abuse some of the DPMS bits.
Comment 6 Jari Tahvanainen 2016-10-12 10:54:57 UTC 
Closing resolved+fixed with verification done by Jesse. Fix done with Revert included in commit 24f3e09.

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