Bugzilla – Bug 42731
[IVB] The whole monitor connected to DP port is black screen while hotplugin VGA
Last modified: 2012-02-13 01:22:30 UTC
Created attachment 53312 [details]
dmesg.txt is the bug's dmesg information
Platform: IvyBridge (Chief River)
The Linux Kernel, the operating system core itself
Some additional commit info:
Author: Linus Torvalds <email@example.com>
Date: Mon Oct 24 09:10:05 2011 +0200
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.
Could any developer reproduce this?
I have try with kernel 3.2 rc6,the issue still occurs.
Does this happen with drm-intel-next or ivb-3-pipe?
(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.
Created attachment 56175 [details] [review]
fixup dp bpc calculations
Can you please try this patch?
(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.
Closing as fixed. Please verify or reopen, thanks.