I have the same problem as here and the solution is saying that I manually installed a driver and this causes the problem. Great! But how do I detect said driver (and deinstall it)?
I tried various ideas from the internet:
$> nvidia-settings -q NvidiaDriverVersion
ERROR: Error resolving target specification '' (No targets match target specification), specified in query 'NvidiaDriverVersion'.
$> grep -i "x driver" /var/log/Xorg.0.log
""
$> lspci -k | grep -EA2 'VGA|3D'
00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06)
Subsystem: CLEVO/KAPOK Computer Device 0170
Kernel driver in use: i915
--
01:00.0 3D controller: NVIDIA Corporation GM107M [GeForce GTX 960M] (rev a2)
Subsystem: CLEVO/KAPOK Computer Device 0170
03:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59)
If anybody wonders - I installed nvidia-settings separately.