Bug 42731

Summary: [IVB] The whole monitor connected to DP port is black screen while hotplugin VGA
Product: DRI Reporter: Guang Yang <guang.a.yang>
Component: DRM/IntelAssignee: Jesse Barnes <jbarnes>
Status: CLOSED FIXED QA Contact:
Severity: major    
Priority: high CC: ben, chris, daniel, jbarnes, yi.sun
Version: unspecified   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: i915 features:
Bug Depends on:    
Bug Blocks: 42991, 44622    
Attachments:
Description Flags
dmesg.txt is the bug's dmesg information
none
fixup dp bpc calculations none

Description Guang Yang 2011-11-08 23:24:51 UTC 
Created attachment 53312 [details]
dmesg.txt is the bug's dmesg information

System Environment:
-------------------
Platform: IvyBridge (Chief River)

The Linux Kernel, the operating system core itself
Kernel: (master)c3b92c8787367a8bb53d57d9789b558f1295cc96
Some additional commit info:
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Mon Oct 24 09:10:05 2011 +0200   

Bug Description:
--------------------
    While we unable the LVDS and boot with monitor connnect to DP,then we plugin VGA port,the two screen can display normally,but if we unplug the VGA monitor, the DP monitor turns to be black. And two errors 
"[drm:pch_irq_handler] *ERROR* PCH poison interrupt" and
"[drm:intel_disable_transcoder] *ERROR* failed to disable transcoder"
always appears in the terminal .
   BTW,if we boot with VGA monitor and plugin and out DP port servel times,the VGA monitor always can display normally.
Comment 1 Gordon Jin 2011-12-19 19:38:01 UTC 
Could any developer reproduce this?
Comment 2 Guang Yang 2011-12-21 01:56:12 UTC 
I have try with kernel 3.2 rc6,the issue still occurs.
Comment 3 Jesse Barnes 2012-01-11 10:57:17 UTC 
Does this happen with drm-intel-next or ivb-3-pipe?
Comment 4 Guang Yang 2012-01-11 18:22:26 UTC 
(In reply to comment #3)
> Does this happen with drm-intel-next or ivb-3-pipe?
It still happens with the latest drm-intel-next.
Comment 5 Daniel Vetter 2012-01-26 03:43:25 UTC 
Created attachment 56175 [details] [review]
fixup dp bpc calculations

Can you please try this patch?
Comment 6 Guang Yang 2012-02-13 01:11:48 UTC 
(In reply to comment #5)
> Created attachment 56175 [details] [review] [review]
> fixup dp bpc calculations
> Can you please try this patch?

I have try this patch with testing branch,the issue don't exists.
Comment 7 Daniel Vetter 2012-02-13 01:17:20 UTC 
Closing as fixed. Please verify or reopen, thanks.
Comment 8 Elizabeth 2017-10-06 14:51:28 UTC 
Closing old verified.

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