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I use Ubuntu 18.04, on Dell XPS 15. There is a huge difference in the resolution of my screens, so when I plugged external monitors, either everything was too big on external monitors or everything was so small on laptop monitor. I used xrandr to setup the scaling as follows:

xrandr --output eDP-1 --scale 1x1 --pos 0x2400
xrandr --output HDMI-1 --scale 2x2 --pos 0x350
xrandr --output DP-2-8 --scale 2x2 --pos 2560x0

eDP-1 is the laptop monitor with resolution 3840x2160, HDMI-1 is a VGA monitor with resolution 1280x1024, for which I use a VGA to HDMI converter to connect and DP-2-8 is another monitor with resolution 1920x1200 connected via display port. After doing this, mouse pointer started to blink, and even disappear only on eDP-1 but not on other screens, when CPU is in use. Let's say I open the settings window for Bluetooth, I cannot see mouse pointer, if I open an email, it blinks a couple of times and stabilizes. Does any one have similar problems or any idea what's going on?

  • I can confirm the exact same behaviour with my XPS 15 9570: xrandr --output eDP-1 --scale .5x.5 --mode 3840x2160 --output DP-1-2 --scale 1x1 --mode 2560x1440 --fb 6400x2880 --pos 0x0 --left-of eDP-1 – Kylea Aug 6 '18 at 7:26
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Adding an xorg configuration file as mentioned here helped me to solve the problem.

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Run the following xrandr command after yours:

xrandr --output eDP-1 --scale 0.9999x0.9999
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  • This worked for me in Linux Mint; I don't know why, but it did. – PenumbraBrah Apr 16 at 20:18
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For users running Ubuntu 19.10, I can confirm that adding a configuration file by booting into recovery, selecting root shell, then running:

X -configure

Then entering:

cp /root/xorg.conf.new /etc/X11/xorg.conf

will both allow you to edit the configuration file, and fixes the common dual-monitor mouse flickering issue.

My current setup includes a Dell XPS 15 9560 with the high-res (4k) display, connected to a 1080p monitor.

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