Bug 80479

Summary: [SNB] Black screen and failed cursor assertions on LVDS+DP
Product: DRI Reporter: Maarten Lankhorst <bugs>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED INVALID QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium CC: bugs, intel-gfx-bugs, jane.silber, przanoni, xiong.y.zhang
Version: unspecified   
Hardware: Other   
OS: All   
See Also: https://launchpad.net/bugs/1315369
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
dmesg with WARN_ON's triggering none

Description Maarten Lankhorst 2014-06-24 14:26:42 UTC 
Copied from launchpad.

After the screen locks I am unable to log back in because the screen with the login prompt is black, and the screen on my laptop just shows the Ubuntu logo.

Furthermore, if I then unplug the external monitor (in an attempt to force the log in option to be displayed on the laptop) the laptop screen then goes black and I can't do anything at all.

I can't reproduce this if I select "lock screen" from the UI, but it happens reliably if it locks due to inactivity.

Other info:
- I am running a fresh install of 14.04
- I have it set to lock after 5 min of inactivity, and require login after lock
- I have an external monitor, configured to be on the left side of the laptop screen
Comment 1 Maarten Lankhorst 2014-06-24 14:36:01 UTC 
Created attachment 101671 [details]
dmesg with WARN_ON's triggering
Comment 2 liulei 2014-07-12 11:16:08 UTC 
I can't reproduce it on my desktop. i will try it on a laptop.
Comment 3 Paulo Zanoni 2014-07-18 20:08:10 UTC 
One of the strange things about this bug is the excessive amount of times the following message appears:
[drm:drm_dp_i2c_do_msg] native defer

If you have the available resources, can you reproduce this bug with a different monitor and/or a different DP cable?
Comment 4 Rodrigo Vivi 2014-07-18 22:50:29 UTC 
Hi Maarten,

Our QA couldn't reproduce the issue here, Paulo couldn't reproduce the issue as well. I tried with IVB, eDP+HDMI and couldn't reproduce.

Then I went to our lab and got a SNB with LVDS and DP, installed a fresh 14.04, configured the external monitor to the left side and waited 5 minutes and also couldn't reproduce the issue. after 5 minutes it is lock and black and after I move the mouse everything just light up and I can normally log in.

On launchpad bugzillas I've seem people reporting the issue with non intel gpu.
or with hibrid using fglrx.

Please provide more info here. Can you double check if this happens even without hibrid and without the fglrx driver and provide the logs?

Thanks,
Rodrigo.
Comment 5 Chris Wilson 2014-07-19 09:55:09 UTC 
Link training fails -> black screen. Everything else is a red herring and are minor irrelevant issues.
Comment 6 Jani Nikula 2014-09-08 14:14:13 UTC 
(In reply to comment #0)
> Copied from launchpad.

What's the launchpad bug?
Comment 7 Jani Nikula 2014-09-08 14:14:54 UTC 
(In reply to comment #6)
> (In reply to comment #0)
> > Copied from launchpad.
> 
> What's the launchpad bug?

Sorry, saw that now in the see also.
Comment 8 Jani Nikula 2014-09-08 14:17:36 UTC 
Any idea if an adapter was used? One reporter at launchpad says the problem is not present after switching from VGA to HDMI:

https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1315369/comments/63
Comment 9 Jesse Barnes 2014-12-05 22:50:04 UTC 
I guess this one is either fixed or dead.

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