I added the requested files. Some more context:
I already suspected the fact that 240Hz could be a possible problem. So I already tried setting both screens to (laptop and external) to 60Hz. Even in that scenario the issue remains. The drm info files attached are with 60Hz. I am confident that my cable supports at least 4K60Hz. If needed, I can also provide the files when in 240Hz. I read the article, which was very interesting, and does give some more insights. At the end, they also state that it might have worked on earlier versions, but no longer in newer, since the checks could be stricter. So that could explain why it worked in 24.04, but no longer works in 25.04 and 25.10. I also ordered 3 new cables: Mini DP, Thunderbolt to HDMI and Thunderbolt to DP. According to the specs, they should all support 4K240Hz. They will arrive in a few days. I will, update here with my findings. Some additional questions: you mentioned nvidia 580 is not supported (fair point). I use the ubuntu graphics ppa and installed the driver through there. It would only be fair that I test the behaviour with the supported drivers. - Which version should I use? - Can it be a version from the ubuntu graphics ppa? - If not, how can I best revert to the officially supported version? ** Attachment added: "journal.txt" https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-580/+bug/2125825/+attachment/5912903/+files/journal.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2125825 Title: External display does not wake after laptop lock To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2125825/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
