The issue did start appearing after an update on 17.10. I bought the Monitor on 29.11.2017, so it worked with the 17.10 kernel version around that time. Since HDMI on 4k only drives the Monitor @30Hz on my laptop, I bought a DP adapter. After the random screen black outs annoyed me too much I switched back to HDMI (around early this year). The monitor wasn't reliably recognized as a 4k monitor anymore.
- I installed the 4.16 Kernel from http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.16.1/ - Powered the laptop off - Switched from DP to HDMI adapter - Boot up with 4.16.1 kernel Monitor resolution was correctly identified - Rebooted with 4.16.1 kernel Monitor was not anymore correctly identified. Instead of 3840x2160@30hz the was at 1920x1080@60Hz Maybe relvant HDMI adapter info: My Lenovo Yoga 910 has a combined Type-C USB3 & DP 1.2 connector. The adapter is a LMP HDMI & USB adapter: https://www.lmp-adapter.com/en/products/cables--adapters/usb-c/lmp-usb-c-to-hdmi-multiport-adapter -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1762986 Title: Display resolution of monitor via HDMI incorrectly identified To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1762986/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
