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Ubuntu 20.04 kernel 5.13 does not work with my laptop display

ca flag

If I do "lock" and return the screen of my lap monitor is only random dots of all colour. Please notice that if I use other displays with USB display link these monitors works correctly, but the laptop gets VERY slow.

It behaves the same if i try to change display resolution! I lose the laptop display with random dots of color. If I do "suspend" the laptop seem to be in deadlock and black.

I followed the recommendation on a similar question; Ubuntu 20.04 multiple monitor issues

And revert from kernel 5.13 to kernel 5.11. and now everything works fine without problem.

Any ideas what to do to adjust my laptop to new kernels?

I could also see similarity to Ubuntu 20.04.3 hangs on boot after upgrade to 5.13 kernel

Score:0
in flag

Yep, this is happening.

Check the solution here (it worked for me): Ubuntu boots to flickering screen with white noise on primary monitor but only with specific Linux kernels - advice on how to fix?

I had the same problem and the solution to use switchblade graphics mode is to go back to kernel 5.11.0.46 (somehow). If you have a BIOS switch for it, you can select discrete graphics mode. Also, maybe try to connect your laptop with an external monitor.

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