Again it seems to be due to different monitor settings. I noticed now on the Live version of Ubuntu the problem doesn't exist. The problem is that the snapshots from timeshift won't boot, unfortunately. So I start the system from Live USB a lot. I've been trying to get my backup restored. So it makes me sure it is a software issue. Dell provides such a tool, and my screen passed the test. I also did the screen test from the BIOS menu.fresh installation of Ubuntu 22.04.2 LTS.Checked the other bug on Launchpad (same issue) - Screen flickering in Ubuntu 22.04. Checked the Launchpad bug - screen is flickering in Ubuntu 22.04.Suggestions from this question - Screen flicker after a fresh install of Ubuntu 22.04.Thanks for your help hopefully, I've given all the information needed to answer this problem. Also, this laptop was bought with Ubuntu 18.04 installed, so I think it has the hardware support. So far, I've been a happy user of Ubuntu for at least three years. Weirdly, something like that happens to the STABLE distro. I checked the BIOS configuration and SGX is software enabled. I'm able to run Ubuntu with those warnings. Pci 0000:00:07.2: DPC: RP PIO log size 0 is invalidīlacklist: Problem blacklisting hash (-13) Pci 0000:00:07.0: DPC: RP PIO log size 0 is invalid I also found new warnings during boot: x86/cpu: SGX disabled by BIOS The flickering started occurring after touching the touchpad or keyboard. When I didn't touch the laptop, the screen was black. The issue appeared for the first time when I turned on the computer at his house. So I unplugged my laptop and went to my neighbor to help him. I didn't install any new packages or drivers the day it happened. It occurs only during logging/screen lock. I found that when I change my internal monitor setting from 59.99 Hz to 48.00 Hz, the flickering is fixed. Which is opposite to other people's issues that I read. The issue occurs only on the internal monitor. Also, I reinstalled Ubuntu, but it didn't help. New filters can be added with the 'Add a Filter' button. Filters are listed below the canvas and glitch/upload/undo buttons, and can be collapsed to hide their configuration. I've checked similar questions, and the proposed solutions worked only for a moment or reduced the glitches, but they didn't fix the issue. Each glitch processing task is composed of one or several filters to apply to the image, with configurable settings such as horizontal or vertical application. The main fix here seems to be forcing a “reboot” of the dongle.I've been struggling with that for the last week. We’ve also found that if you’re using your power adapter via the adapter, simply unplugging the power adapter from the dongle and reinserting it, or using the power on an alternative Thunderbolt port seems to clear up image issues. Then plug the adapter in first, then attach the monitor. So unplug the adapter from the Mac, and then the monitor from the adapter. Most important seems to be power-cycling the adapter. We’ve seen some strange flicker and “crawling” screen pixels when using an external monitor with a Mac, and one reliable fix is to plug the various components in using a specific sequence. RELATED: Everything You Need to Run Multiple Monitors from Your M1 MacBook Try Different Plug-in Sequences You can try borrowing a different adapter to see if this resolved the issue or check with the manufacturer to see if there’s a firmware update or other fix available for known issues. This works fine in general, but if you’re experiencing screen flicker, it might be down to problems with your HDMI or DisplayPort dongle. Most modern Macs have a paucity of ports, relying on a handful of Thunderbolt ports and adapters to connect peripherals.
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