The most complete thread on this problem is over on Ask Ubuntu.
On Friday, February 18, 2023, my Dell XPS 13 Plus 9320 Developer Edition (Ubuntu 22.04.2 LTS) applied a set of automatic updates, including a a number of Dell specific updates (e.g., oem-somerville-tentacool-meta:amd64, oem-somerville-factory-tentacool-meta:amd64) and a BIOS update to version 2.0.0. Immediately thereafter, I started experiencing significant problems: bands of random colored pixels across the screen when I move the mouse, built-in camera stopped working, etc.). I have since discovered (through Googling) that the BIOS update was an error on Dell's part. I don't know about the other updates. The only suggestions from tech support have been to (a) Manually downgrade back to BIOS 1.11.0 (which I was able to do only with help from folks watching the Github issue above), but that didn't seem to fix the issues, and then (b) Reinstall the OS. In terms of reinstalling the OS, tech support first pointed me to this page to download the Dell recovery image specifically for this machine (which sounded reasonable), but when I typed in my service tag number, it said "Recovery image currently unavailable." Then they sent me to the generic Ubuntu installation site. When I pushed back and said that I thought this machine needed a proprietary Dell image to support all of the hardware, they said they "don't have another method to get the Dell image of Ubuntu", but now suggested I try recovering from hard drive., which again maybe sounds reasonable, but all of this conflicting information (and lack of curiosity about the original Dell updates that presumably caused all of this) is making me very nervous.Has anybody had any luck finding folks within Dell support that specifically support Ubuntu? Again, I bought this machine with Ubuntu pre-installed and certified.
Problems after Ubuntu updates on Dell XPS Plus 9320 Developer edition