An issue of screen display with 21.10

When I switch folders in pcmanfm-qt, black discontinuous lines appear on the screen and disappear very quickly then. I have Intel HD Graphics 530 working on my laptop.There was no such issue with 21.04 or older distros.

Please suggest in which direction I should go to solve it.

More info below.

If I add nomodeset in the grub, black lines will not appear. Since I have external monitor connected, I have to remove nomodeset.

1 Like

I tried with xubuntu 21.10 and found there’s no such issue with it. From this fact I think it’s lxqt’s problem.