Bug 101917 - [IGT][SKL] Failed DP link training attempt on resume with disconnected connector when testing with Chamelium
Summary: [IGT][SKL] Failed DP link training attempt on resume with disconnected connec...
Status: CLOSED WORKSFORME
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: DRI git
Hardware: Other All
: medium normal
Assignee: Intel GFX Bugs mailing list
QA Contact: Intel GFX Bugs mailing list
URL:
Whiteboard: ReadyForDev
Keywords:
Depends on:
Blocks:
 
Reported: 2017-07-25 14:15 UTC by Paul Kocialkowski
Modified: 2018-04-20 14:20 UTC (History)
1 user (show)

See Also:
i915 platform: SKL
i915 features: display/DP

Attachments
dmesg from 20170721 drm-tip (134.17 KB, text/plain)
2017-07-25 14:15 UTC, Paul Kocialkowski 		no flags Details
View All

Description Paul Kocialkowski 2017-07-25 14:15:51 UTC 
Created attachment 132955 [details]
dmesg from 20170721 drm-tip

i915 attempts to perform DP link training on resume with a connector that was reported as disconnected before suspend, which fails with:
[CONNECTOR:55:DP-1] Link Training failed at link rate = 162000, lane count = 4

This occurs when running the hdmi-edid-change-during-suspend IGT test with a Chamelium connected to both the HDMI and DP port of the DUT. The chamelium test will unplug all connectors (through their HPD line), including the concerned DP connector (DP-1). It will then connect the HDMI connector for the test, and suspend. The DP connector remains in a disconnected state, despite being physically attached. i915 then attempts to perform the link training on the DP connector.

If the DP connector is physically disconnected from the start, i915 does not attempt to perform link training for it.

Information about the setup:
* Kernel: drm-tip 2a4f73050a961e1a176d35561e39386da9ea9c67
* Distro: Arch Linux (NOT using the distro's kernel)
* CPU: i5-6600K
Comment 1 Elizabeth 2017-07-27 14:47:07 UTC 
Adding tag into "Whiteboard" field - ReadyForDev
*Status is correct
*Platform is included
*Feature is included
*Priority and Severity correctly set
*Logs included
Comment 2 Elizabeth 2017-10-16 17:12:26 UTC 
Hello Paul, any news with the latest commits? Preferable drm-tip.
Comment 3 Elizabeth 2018-03-05 19:21:11 UTC 
Is this still valid with latest drm-tip? Thank you.
Comment 4 Jani Saarinen 2018-03-29 07:10:43 UTC 
First of all. Sorry about spam.
This is mass update for our bugs. 

Sorry if you feel this annoying but with this trying to understand if bug still valid or not.
If bug investigation still in progress, please ignore this and I apologize!

If you think this is not anymore valid, please comment to the bug that can be closed.
If you haven't tested with our latest pre-upstream tree(drm-tip), can you do that also to see if issue is valid there still and if you cannot see issue there, please comment to the bug.
Comment 5 Jani Saarinen 2018-04-20 14:20:20 UTC 
Closing, please re-open if still occurs.

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