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.

Could you try to use nvidia-settings to disable your laptop screen, via the X Server Display Configuration menu and use save X configuration file (in /tmp/xorg.conf) back up you actual /etx/X11/xorg.conf if you have one and then replace your working dual screen conf by the /tmp/xorg.conf

NB : actually the xorg.conf file generated is not perfect it misses the config for the second monitor, and still use the laptop screen identifier in the Screen section while adding the external monitor config

dpkg -s nvidia-settings-legacy-340xx
Package: nvidia-settings-legacy-340xx
Status: install ok installed
Priority: optional
Section: contrib/x11
Installed-Size: 1861
Maintainer: Debian NVIDIA Maintainers <pkg-nvidia-de...@lists.alioth.debian.org>
Architecture: amd64
Version: 340.93-1
Depends: pkg-config, nvidia-legacy-340xx-alternative, libc6 (>= 2.14), libgdk-pixbuf2.0-0 (>= 2.22.0), libglib2.0-0 (>= 2.12.0), libgtk2.0-0 (>= 2.8.0), libjansson4 (>= 2.3), libpango-1.0-0 (>= 1.14.0), libx11-6 (>= 2:, libxext6, libxxf86vm1
Pre-Depends: nvidia-installer-cleanup
Recommends: libgl1-nvidia-legacy-340xx-glx
Breaks: nvidia-alternative (<< 313.30-2), nvidia-alternative-legacy-173xx (<< 173.14.37), nvidia-alternative-legacy-96xx (<< 96.43.23-4) Description: tool for configuring the NVIDIA graphics driver (340xx legacy version)
 The nvidia-settings utility is a tool for configuring the NVIDIA
 Linux graphics driver.  It operates by communicating with the NVIDIA
 X driver, querying and updating state as appropriate.  This
 communication is done with the NV-CONTROL X extension.
 Values such as brightness and gamma, XVideo attributes, temperature,
 and OpenGL settings can be queried and configured via nvidia-settings.
Homepage: ftp://download.nvidia.com/XFree86/nvidia-settings/

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