Bug 98467 - Baytrail MIPI/DSI Black screen when boot with HDMI connected
Summary: Baytrail MIPI/DSI Black screen when boot with HDMI connected
Status: CLOSED INVALID
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: XOrg git
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Intel GFX Bugs mailing list
QA Contact: Intel GFX Bugs mailing list
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2016-10-28 08:38 UTC by Fab Pie
Modified: 2017-06-02 12:20 UTC (History)
2 users (show)

See Also:
i915 platform: BYT
i915 features: display/DSI

Attachments
dmesg with drm.debug=14 with and without error and i915_vbt (58.16 KB, application/x-zip-compressed)
2016-10-28 08:38 UTC, Fab Pie 		no flags Details
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Description Fab Pie 2016-10-28 08:38:41 UTC 
Created attachment 127581 [details]
dmesg with drm.debug=14 with and without error and i915_vbt

I'm testing a Baytrail device with mipi/dsi display and hdmi output. 
When I boot without the hdmi connected the mipi/dsi works OK and after connecting the hdmi both mipi/dsi and hdmi display graphics OK. (attached dmesg-mipi-ok.txt)
If I boot with the hdmi connected it's selected by the bios as the default display, Ubuntu only boots in hdmi and it works OK in this display but MIPI/DSI is black. It's listed as connected by xrandr but I can't reset in any way.(attached dmesg-mipi-error.txt)
I'm using Ubuntu 16.10 with kernel 4.8.4
Also attached /sys/kernel/debug/dri/0/i915_vbt in zip
BR.
Fabian
Comment 1 Fab Pie 2016-10-28 21:33:25 UTC 
Same issue on Asus T100TAF (Baytrail-CR)
Comment 2 Jani Nikula 2016-11-24 20:29:22 UTC 
Please try drm-tip branch of https://cgit.freedesktop.org/drm-tip
Comment 3 Ricardo 2017-02-22 16:56:50 UTC 
hello Fab Pie can you please try Jani's suggestions and do the following:

if the problem persist, update logs and set the bug to reopen
if the problem is gone, update the bug to resolved

if no action is taken in the next 30 days the bug will be closed
Comment 4 Ricardo 2017-05-30 17:52:23 UTC 
based on the lack of activity and a response from the submitter to update results with latest configuration the bug will be closed

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