@kovidgoyal

for calibre!
I installed calibre version 3 on Debian 9 Stretch xfce.
- it works on the desktop

- it does not work with (tight)vncserver on port 5901
-> error (taken from a terminal prompt fter starting calibre):
Code:
$ calibre
Qt: XKEYBOARD extension not present on the X server
Xlib: extension "RANDR" missing on display ":1.0".
$
I do not know if its supposed to work with VNC, but it's a bummer that it failed.