Bug 88648

Summary: [SNB]when connect to 2 monitor and start x, unplug/plug one of them will change mode from clone to extend.
Product: DRI Reporter: Ding Heng <hengx.ding>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED NOTOURBUG QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium CC: intel-gfx-bugs
Version: DRI git   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
dmesg
none
Xorg.0.log none

Description Ding Heng 2015-01-21 02:40:18 UTC 
==System Environment==
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Regression: no, I didn't found good commit on testing branch.

==kernel==
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drm-intel-testing:6dd5bb25ce0ed3a0012b69d553d74e1a0d39c313

==Bug detailed description==
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1.Connect SNB to 2 monitors, one of them is DP, the other is DVI.
2.startx
3.xrandr --output DP2 --same-as HDMI3
4.unplug DP monitor
5.plug DP monitor.
6.check if the monitors stay in clone mode.
Comment 1 Chris Wilson 2015-01-21 09:16:30 UTC 
Please try with a bare X and always attach the dmesg and Xorg.0.log. In this case you will also want to attach the output of xrandr to support your assessment.
Comment 2 Ding Heng 2015-01-22 03:03:19 UTC 
Change step 2 to "xinit&", this issue no longer exist. But DP monitor failed to light up after unplug/plug(which has been described in Bug 85641).
(In reply to Chris Wilson from comment #1)
> Please try with a bare X and always attach the dmesg and Xorg.0.log. In this
> case you will also want to attach the output of xrandr to support your
> assessment.
Comment 3 Ding Heng 2015-01-22 03:06:26 UTC 
Created attachment 112636 [details]
dmesg
Comment 4 Ding Heng 2015-01-22 03:06:58 UTC 
Created attachment 112637 [details]
Xorg.0.log
Comment 5 Chris Wilson 2015-01-22 07:51:31 UTC 
So the original issue is that your de overrides how you wanted the display configured on a hotreplug.
Comment 6 Yi Sun 2015-02-02 01:20:24 UTC 
We can take this behavior as default.

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