Ubuntu

Dual Monitor configuration is failing after lock screen

Asked by darkhawk

 Hey Guys, running 15.10-x64 on a lenovo thinkpad t450s with intel vga. 2 external monitors
                  (Eizo 23" fullhd), conected by displayport and dvi, booting up the system and everything is
                  fine...dual monitor is running.....after pressing the windowskey+L for locking screen (or
                  clicking in the right corner on lock screen) both screens went black....after some time...a
                  minute or 30 seconds i come back and log-in again only one external monitor is coming
                  back...the other one is not working...i have to disable this monitor inside the screens setting
                  in ubuntu, and turn it on again by clicking on "active"...after that i can reconfigure my
                  desktop again with both monitors...dmesg is showing: [drm:gen8_irq_handler [i915]] *ERROR* The
                  master control interrupt lied (SDE)! any ideas?

Linux t450s 4.2.0-19-generic #23-Ubuntu SMP Wed Nov 11 11:39:30 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

Any ideas?

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Lars Ehrhardt (le-launchpad) said : 		#1

Confirmed, I have the same issue - also using a Thinkpad 450s with the latest 4.4rc8 kernel snapshot from January 5th 2016. After a suspend both external monitors went black and I have to manually disable and enable them.

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