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I use ubuntu 20.04 on the login screen everything is fine but when I login then pixelated lines and patters come on the screen. Some keyboard button also stopped working after login. Please help. I think this happened after i installed some codes from ubuntu. I deleted git and everything related to it. But the problem is still there. I have intel uhd 620.

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  • I also tried to use my android as a second screen for laptop so I installed something from git and then I also used lightdm. Dec 15, 2021 at 8:10
  • To see if this is Xorg related, try (temporarily) changing to Wayland: on the log in screen, before entering your password, click the cog wheel and select the Wayland session. In addition, edit your post and add information about your graphics card
    – vanadium
    Dec 15, 2021 at 8:26
  • i tried it with wayland the screen problem is gone but some keys stopped working on my additional keyboard. Dec 15, 2021 at 13:44
  • Information useful for identifying the error should be in your question. "Some keys" is not particularly useful information. If you do not stay on Wayland, you could check whether adding the kernel boot parameter ` i915.enable_psr=0` does not help. I need to use this with an Intel graphics card.
    – vanadium
    Dec 15, 2021 at 14:03
  • When I reset my dconf editor everything works fine but when I restart my ubuntu again the problem continues. Dec 15, 2021 at 14:50

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