Created attachment 118206 [details] dmesg before and after / modInfo output Hi ! I have video problems with my broadwell video output. With some external projectors (plugged through mini-displayport to VGA adaptor) I have issues with flickering and loosing external projector. Steps to reproduce : 1/ Plug the external monitor 2/ Put some window on it 3/ Work between 5 and 1 minute 4/ Projector goes black, output seems to be lost 5/ Projector and laptop screen blink 6/ Sometimes projector never goes back, sometimes it reappears again for a while 7/ Repeat 4/ I tried with kernel 4.2 : same issue I tried with sna rather than uxa : same issue I tried enable_ips=0, enable_fbc=0, enable_rc6=1 : same issue The odd thing is that it seems to depend on the connected projector. Machine : Dell XPS 13 2015 Distribution : Arch linux Connector : Dell mini-displayport to VGA adapter CPU : Intel(R) Core(TM) i5-5300U CPU @ 2.30GHz Kernel : 4.1.6-1-ARCH #1 SMP PREEMPT Mon Aug 17 08:52:28 CEST 2015 x86_64 GNU/Linux xf86-video-intel: 2.99.917.463.gd50d336-1 (from git) or even with 2.99.917+381+g5772556-1 (from arch repository)
OK, I am closing the bug as it was related to a hardware problem. Just in case it can help other people: The problem was due to the mini-displayport adapter which had troubles with a particular projector... I bought a startech MDPVGA2 adapter, and now everything is OK...
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