Bug 91627 - [NV117] KMS failed on DisplayPort with 750 Ti
Summary: [NV117] KMS failed on DisplayPort with 750 Ti
Status: RESOLVED FIXED
Alias: None
Product: xorg
Classification: Unclassified
Component: Driver/nouveau (show other bugs)
Version: unspecified
Hardware: Other All
: medium normal
Assignee: Nouveau Project
QA Contact: Xorg Project Team
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2015-08-13 16:55 UTC by Tom Yan
Modified: 2015-08-22 04:13 UTC (History)
0 users

See Also:
i915 platform:
i915 features:

Attachments
debug log with DP connected (402.90 KB, text/plain)
2015-08-13 16:56 UTC, Tom Yan 		no flags Details
debug log with DVI/HDMI connected (311.00 KB, text/plain)
2015-08-13 16:57 UTC, Tom Yan 		no flags Details
View All

Description Tom Yan 2015-08-13 16:55:06 UTC 
I have an EVGA GeForce 750 Ti connected to an EIZO EV2336W. nouveau modesets successfully with TMDS outputs (DVI/HDMI), but with DP it gives black screen once it attempts to do so. Attached are the kernel debug logs of the failed DP and the working DVI/HDMI for reference.

Arch Linux with linux 4.1.4-1 in the core repo.
Comment 1 Tom Yan 2015-08-13 16:56:50 UTC 
Created attachment 117668 [details]
debug log with DP connected
Comment 2 Tom Yan 2015-08-13 16:57:29 UTC 
Created attachment 117669 [details]
debug log with DVI/HDMI connected
Comment 3 Ilia Mirkin 2015-08-21 21:39:36 UTC 
There are some fixes for a K620 (GM107) board here:

http://cgit.freedesktop.org/~darktama/nouveau/log/?id=9ce7d1009c64045a0875640b4cb4ae55e0c7aa87

You can try applying them to your kernel and see if the situation improves.
Comment 4 Tom Yan 2015-08-22 04:13:49 UTC 
I applied the four patches by Ben Skeggs to linux-4.1.5 and now KMS works like a charm with DP. Thanks a lot!

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