There have been numerous posts on external monitor support for the Dell XPS 13" laptop but unfortunately they haven't been of much help. I have a USB 3.0 dongle from Dell called DA100 that offers extensions to HDMI and VGA outputs among others. It employs a DisplayLink chipset which is supported by Ubuntu (http://www.displaylink.com/downloads/ubuntu). I'm using Kubuntu 16.04 with
jimakos@kubu:~$ uname -a Linux kubu 4.4.0-59-generic #80-Ubuntu SMP Fri Jan 6 17:47:47 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
My laptop screen is set to 3200x1800 and my external monitor is a 1920x1080. I've setup correctly my dpi as well following the links in
jimakos@kubu:~$ xdpyinfo |grep dots resolution: 277x277 dots per inch
which is the correct dpi for my resolution.
xrandr identifies both monitors correctly
jimakos@kubu:~$ xrandr | grep -w connected eDP1 connected primary 3200x1800+0+0 (normal left inverted right x axis y axis) 294mm x 165mm DVI-I-1-1 connected 1920x1080+3200+0 510mm x 287mm
and I can enable the external one in System Settings -> Display and Monitor.
At this point my external monitor is activated with a black desktop and the desktop toolbox appears at the top left corner. I suppose they are in a side-by-side configuration. The problem is that everything appears huge on the external monitor, obviously because I use a scale factor of 2 for my highDPI laptop screen to get a nice output. Ideally, the solution would be to set 2 different scalings for the laptop and the external monitor, right?
I tried some
xrandr commands shown here https://askubuntu.com/questions/39340...fferent-screen and here https://wiki.archlinux.org/index.php...tiple_displays but I was not able to scale down the external monitor. For example I tried to run (DVI-I-1-1 is my external monitor)
jimakos@kubu:~$ xrandr --output DVI-I-1-1 --scale 2x2 X Error of failed request: BadValue (integer parameter out of range for operation) Major opcode of failed request: 140 (RANDR) Minor opcode of failed request: 26 (RRSetCrtcTransform) Value in failed request: 0x129 Serial number of failed request: 48 Current serial number in output stream: 49
Next I tried to downscale the fonts dpi via System Settings -> Fonts to just 96 and rebooted. Most of the desktop components were shrunk and appeared fine on my external monitor. However, application like Kate, Texstudio, or even the environment for the Settings were still scaled up and only the fonts were small. Firefox, Chrome or Thunderbird appear just fine. Mouse is a bit sluggish by the way. This is the closest I've got to a solution.
Do you think that a direct cable for the USB-C video output of XPS would work better or is it irrelevant to the scaling problem?
ps: in Windows 10 I was able to get a working setup on the very same monitor.