On 10/12/2016 11:44 AM, Eric Valette wrote:
On 10/12/2016 10:57 AM, Eric Valette wrote:
On 10/11/2016 04:22 PM, Eric Valette wrote:
On 10/11/2016 04:10 PM, Dominique Dumont wrote:


Could you try that on your side ?
I can do the test but I never open the lid when docked so this will not
be my use case and this means also modifying my xorg.conf.

Once session is initialized with kdm, in system settings-> display and
monitor, I have DP4 on at 1920x1200 (as reported by xrandr even when
failing) and DP3 off.

I tried to let the lid open with my actual xorg.conf and rebooted, both
screen go black. I can still switch to laptop lid in text mode using
ctrl-alt-f1. I loged to my accound, killed sddm service and did a
startx, and the kde session shows up correctly on the external monitor
and laptop screen goes black.


I was in a meeting so undocked my laptop and by curiosity completely removed the xorg.conf and tried sddm. Even in this simpliest config it fails and the screen goes black after displaying the Nvidia logo (usually I use the No Logo option but as xorg.conf was empty). I got sddm errors in /var/run/sddm.log. It says the greeter can't open the display.

So probably the problem is not the docking and the external monitor. Compared to other working setup with same software stack (legacy 340 nvidia driver), the only thing I can see that differs is the fact that the laptop lid is wired via DisplayPort versus HDMI.

xrandr on this config when started via kdm
Screen 0: minimum 8 x 8, current 1440 x 900, maximum 8192 x 8192
VGA-0 disconnected (normal left inverted right x axis y axis)
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 connected primary 1440x900+0+0 (normal left inverted right x axis y axis) 304mm x 190mm
   1440x900      59.96*+  39.96
DP-4 disconnected (normal left inverted right x axis y axis)



--eric

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