I don't know how exactly describe this, but here is a picture:
Sometimes it gets even worse than this.
edit:
back in Gnome I pressed Ctrl + F2 and in the input that showed up I entered r and fixed graphics
but now I have kde and I don't know any temp solution like that
here is the output of lspci -k | grep -iEA3 '3d|vga'
:
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 0b)
Subsystem: Lenovo Haswell-ULT Integrated Graphics Controller
Kernel driver in use: i915
Kernel modules: i915
--
03:00.0 3D controller: NVIDIA Corporation GM108M [GeForce 840M] (rev a2)
Subsystem: Lenovo GM108M [GeForce 840M]
Kernel driver in use: nvidia
Kernel modules: nvidiafb, nouveau, nvidia_drm, nvidia