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Two days ago my screen went crazy. I have two monitors, and it happens on both. From freezing, to flickering, glitching, random texts disappearing and reappearing on webpages, plus, on my settings page it should, for example, "De. ault Applications", "Fire. ox", etc, with the small letter f being substituted by a dot, but only in parts of the text. My specifications are Intel® Core™ i5-3570K CPU @ 3.40GHz × 4 ,Intel® HD Graphics 4000 (IVB GT2),memory 15.3 GiB,Ubuntu 20.04.1 LTS, Windowing system X11,GNOME version 3.36.3

This started happening after an update, but I didn't find ways to fix this. Can anyone help me on what could be causing this?

Wrichik Basu
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ubuntunoob
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    You're probably running on the 5.8.0.-49 or -50 kernel. Do uname -r to check. It's bugged. Boot to -48 and wait for an update to -51 or later. – heynnema May 02 '21 at 14:55
  • I updated to 5.12.1-051201-generic and it worked! thank you – ubuntunoob May 02 '21 at 15:48
  • 5.12.1 is a test kernel, and really shouldn't be run except to test with. You'd do better to wait for the official -51 kernel, and run on -48 for now. – heynnema May 02 '21 at 15:56
  • Ok, this will be a probably dumb question, but how do I do that? I searched about booting to -48, kernel versions and all, but I only found of how to choose a version to install, such as v5.8.0, but not how to specify either -48,-49,-50 ... I don't understand which kernel to install then – ubuntunoob May 02 '21 at 16:20
  • Boot to GRUB menu. Choose Advanced Options. Select the -48 (or earlier) kernel. You can also see my answer at https://askubuntu.com/questions/1333025/strange-graphics-issues-such-as-flickering-application-windows-and-inconsistent – heynnema May 02 '21 at 16:22

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