Bug 104319 - AMDGPU/DC: Internal display corrupted when connecting (mirroring/extending) an external monitor on HDMI
Summary: AMDGPU/DC: Internal display corrupted when connecting (mirroring/extending) a...
Status: RESOLVED FIXED
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/AMDgpu (show other bugs)
Version: XOrg git
Hardware: Other All
: medium normal
Assignee: Default DRI bug account
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Depends on:
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Reported: 2017-12-18 13:05 UTC by Carlo Caione
Modified: 2018-04-24 18:54 UTC (History)
2 users (show)

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i915 platform:
i915 features:

Attachments
dc-mirroring-journal (84.25 KB, text/plain)
2017-12-18 13:05 UTC, Carlo Caione 		no flags Details
dc-warning-hdmi-detached (113.32 KB, text/plain)
2017-12-18 13:08 UTC, Carlo Caione 		no flags Details
dc-extended-journal (98.42 KB, text/plain)
2017-12-18 13:53 UTC, Carlo Caione 		no flags Details
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Description Carlo Caione 2017-12-18 13:05:41 UTC 
Created attachment 136245 [details]
dc-mirroring-journal

Same machine as on the https://bugs.freedesktop.org/show_bug.cgi?id=104281 but reproduced on multiple ACER laptops.

Using the latest Linus master compiled with CONFIG_DRM_AMD_DC_PRE_VEGA=y we have that sometimes the image on the internal panel gets corrupted when mirroring on an external HDMI display (see [0]).

We have verified that this is a regression introduced by the DC code. In attachment the journal output.

[0] https://imgur.com/a/rnItJ
Comment 1 Carlo Caione 2017-12-18 13:08:44 UTC 
Created attachment 136246 [details]
dc-warning-hdmi-detached

We have also verified that when disconnecting the HDMI cable, the system is not stable anymore, with corruption and flickering on the internal panel also without the HDMI cable connected.

As you can see from the attached journal that the log is filled with WARNINGS from the DC code.
Comment 2 Carlo Caione 2017-12-18 13:53:37 UTC 
Created attachment 136248 [details]
dc-extended-journal

I just reproduced the same issue this time with the external HDMI monitor in extended mode, not mirroring. It attachment the log.
Comment 3 Daniel Drake 2017-12-21 12:28:38 UTC 
Need to do more testing to be sure, but it appears that this is not reproducible on the development branch https://cgit.freedesktop.org/~agd5f/linux/log/?h=amd-staging-drm-next
Comment 4 Harry Wentland 2017-12-21 14:57:48 UTC 
Thanks, Daniel. The fix should land for 4.16 then.
Comment 5 Harry Wentland 2018-04-24 18:54:42 UTC 
Marking resolved as reported to work fine on amd-staging-drm-next. If this is still an issue feel free to reopen.

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