A black screen usually means there's a poor HDMI connection so getting a higher quality cable is advisable. It's all about the bandwidth. DisplayLink also makes the problem worse because you're limited to the bandwidth of a USB port which is usually MUCH lower than that of a native HDMI port. DisplayLink does some compression but that only goes so far.
This is almost certainly a hardware problem and you shouldn't try to run high refresh rate or high resolution monitors over DisplayLink. Such bugs can come and go as the quality of the connection changes over time, or as driver updates change how display bandwidth is detected. But if you want a reliable permanent solution then: 1. High refresh rate or high resolution monitors must not go through DisplayLink; and 2. Make sure you have high grade cabling - over spec for what you think you need. Looking at the machine specs (https://psref.lenovo.com/Product/IdeaPad/IdeaPad_Slim_5_14IAH8), I think the best option here is to use the: > 2x USB-C® 3.2 Gen 1 (support data transfer, Power Delivery 3.0 and DisplayPort™ 1.4) because those ports support high bandwidth DisplayPort. So all you need is some USB-C-to-DisplayPort or USB-C-to-HDMI cables (that are not DisplayLink adapters). ** Package changed: xorg (Ubuntu) => ubuntu ** Changed in: ubuntu Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2102171 Title: Screen goes black (external monitor via displaylink) when set on 100hz To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/2102171/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
