Bug 92280 - Kernel hangs when trying to use DisplayPort 1.2 MST on a Macbook Pro Retina 13' 12,1 with Dell U2414H
Summary: Kernel hangs when trying to use DisplayPort 1.2 MST on a Macbook Pro Retina 1...
Status: CLOSED WORKSFORME
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: DRI git
Hardware: Other All
: medium normal
Assignee: Clinton Taylor
QA Contact: Intel GFX Bugs mailing list
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2015-10-04 20:40 UTC by Ricardo Salveti de Araujo
Modified: 2017-03-21 13:43 UTC (History)
1 user (show)

See Also:
i915 platform: BDW
i915 features: display/DP MST

Attachments
Syslog with logs from 2 boots, first when I got the hang, and second when it worked but at 1024x768 (621.98 KB, text/plain)
2015-10-04 20:40 UTC, Ricardo Salveti de Araujo 		no flags Details
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Description Ricardo Salveti de Araujo 2015-10-04 20:40:35 UTC 
Created attachment 118660 [details]
Syslog with logs from 2 boots, first when I got the hang, and second when it worked but at 1024x768

When trying to use my Dell U2414H with DisplayPort MST enabled, it either hangs, or it works partially at 1024x768.

My system:
Architecture: amd64
DistroRelease: Ubuntu 15.10
MachineType: Macbook Pro Retina 13' 12,1
PackageArchitecture: amd64
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.3.0-994-generic root=UUID=18d6ce44-8181-4fa9-b3f8-c5bda84f3d80 ro quiet splash drm.debug=0x06 vt.handoff=7

cod/tip/drm-intel-nightly/2015-10-02
eb69e51ab8c85257b6475053ac86200b423c5b68
Comment 1 Jani Nikula 2016-04-25 07:49:18 UTC 
Please try current drm-intel-nightly branch of http://cgit.freedesktop.org/drm-intel
Comment 2 Clinton Taylor 2016-11-14 19:00:03 UTC 
DisplayPort MST code in the i915 driver has been reworked to solve many of these types of problems. Please retest with the latest drm-intel-nightly branch of http://cgit.freedesktop.org/drm-intel.
Comment 3 Jari Tahvanainen 2017-03-21 07:30:15 UTC 
Timeout. Marking this resolved+worksforme. No reply from reporter if problem is still valid. Please reopen if need to be.

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