On Thu, Oct 19, 2017 at 10:06:05AM +0200, Floris wrote: > Maybe you can find more information in the log messages. /var/log/Xorg.x.log > gives information about the X server. Or try journalctl to read all log > messages.
The X log can either be in /var/log/Xorg.*.log or in ~/.local/share/xorg/Xorg.*.log depending on how X is started, in which version of Debian, on which hardware. See <https://www.debian.org/releases/stretch/amd64/release-notes/ch-whats-new.en.html#x-no-longer-requires-root>
