Bug 89036

Summary: [SKL regression] 3 pipe displays cannot work together randomly(fail rate: 20%)
Product: DRI Reporter: fangxun <xunx.fang>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED FIXED QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: major    
Priority: high CC: intel-gfx-bugs, james.ausmus, przanoni
Version: unspecified   
Hardware: All   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
debug with drm.debug=0xe none

Description fangxun 2015-02-09 09:11:58 UTC 
==System Environment==
--------------------------
Regression: not sure

Non-working platforms: SKL

==kernel==
--------------------------
drm-intel-nightly(2015_02_08)/b4442e

==Bug detailed description==
-----------------------------
The Linux graphics driver for Skylake will support Display Concurrency - 1 embedded + 2 external up to max supported resolution all with blend, scale and rotate.

3 pipe doesn't work on SKL with latest (2015_02_08) -nightly branch.
At the moment, two combinations eDP+DP and eDP+HDMI work well.
Comment 1 wendy.wang 2015-02-09 09:21:46 UTC 
Failed machine is SKL-Y

On Jan. 21 2015, we can see 3 pipe display can work together on the same machine using internal tree.
Comment 2 Damien Lespiau 2015-02-09 15:05:38 UTC 
Could you provide the dmesg logs with drm.debug=14 with the failure?
Comment 3 fangxun 2015-02-10 09:53:15 UTC 
Created attachment 113308 [details]
debug with drm.debug=0xe
Comment 4 liulei 2015-02-11 03:42:16 UTC 
Add more information:
Three monitors can be lighted up at the same time as below steps(reproduce :20%).
1. boot eDP + DP
2. plug in HDMI after os boot.

Other failing combinations I've tried:

1. boot eDP + HDMI, plug in HDMI after os boot.
2. boot eDP, after os boot, plug HDMI then plug DP.
3. boot eDP, after os boot, plug DP then plug HDMI.
Comment 5 Paulo Zanoni 2015-03-09 15:26:38 UTC 
We just merged some SKL fixes that may affect all display-related tests. Please retest this bug against the latest drm-intel-nightly.
Comment 6 fangxun 2015-03-11 01:52:17 UTC 
The issue still happens on latest drm-intel-nightly(2015_03_10)/c09a3b.
Comment 7 liulei 2015-03-16 12:27:10 UTC 
This issue doesn't exit on latest -nightly(drm-intel-nightly_f7def4_20150314).So close this bug.
Comment 8 Elizabeth 2017-10-06 14:31:29 UTC 
Closing old verified.

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