With Ubuntu 19.10: I am not able to reproduce the issue with a single monitor of a different brand plugged into the DisplayLink adapter. There are three differences here and I don't have the equipment available where I am right now to narrow down which of them is relevant:
* one monitor instead of two; * different brand and dimensions of monitor; and * I'm only using the HDMI plug on the DisplayLink adapter, not the DVI plug. However, one thing I do observe with this configuration -- which again, doesn't crash -- is that screen updates to the DisplayLink monitor are Extremely Slow. Like I am typing in a terminal window and it sometimes takes a second or two between when I type something and when the results of the typing show up in the terminal. If I move the same terminal window onto the built-in laptop display the lag goes away. The update lag does not occur when I use Xorg instead of Wayland. Attempting to test Ubuntu 20.04 on same laptop booting from Thumb drive: Live CD user doesn't support Wayland. Tried creating new user, Wayland wasn't available for that user either. Of course DisplayLink stuff isn't installed either, so the laptop doesn't actually notice the DisplayLink display when I plug it in. So to make this test work I would have to figure out how to install Wayland in the running live image and install the DisplayLink stuff too. The DisplayLink stuff I can figure out, but not sure about how to enable Wayland sessions in the live image. Attempting to test Ubuntu 20.04 on a slightly different laptop: I upgraded a spare laptop to Ubuntu 20.04, managed to get DisplayLink installed onto it (I had to tweak the installer package not to compile and install the dkms modules and to use the ones that ship with Ubuntu instead), and tested it. Again, keep in mind that in my current setup I'm unable to reproduce the hanging issue, but I did reproduce the display lag. Next steps: 1. On the laptop where I encountered the hanging issue, I am using the evdi kernel module and library that are shipped with the DisplayLink reference implementation release from last July, rather than the newer module and library that are included in Ubuntu. I need to reinstall evdi on that laptop using the tweak I mentioned above for 20.04, so that I am using the Ubuntu version of the module and library with 19.10, to see if the problem persists. I.e., the crashing issue may resolve if I use the evdi kernel module and library that ship with Ubuntu. 2. If not, then test various configurations and try to identify which of the factors above triggers the issue (one monitor vs. two; brand and dimensions of monitor; HDMI vs. DVI plug in adapter). 3. Test whether I am able to reproduce the issue in 20.04 on the spare laptop with the monitor configuration with which I encountered the issue in 19.10. 4. Try to figure out how to install and enable both Wayland and the DisplayLink manager in a running Live CD session so that I can test with the laptop that I know has encountered this issue in the past. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1853357 Title: display (whole computer?) hangs when I attempt to use DisplayLink with Wayland Status in Mutter: New Status in mutter package in Ubuntu: Incomplete Status in mutter source package in Eoan: Confirmed Status in mutter source package in Focal: Incomplete Bug description: [ Impact ] I am using the DisplayLink driver for Ubuntu provided at https://www.displaylink.com/downloads/ubuntu DisplayLink is working under Xorg, but when I try to use it under Wayland my whole display hangs and I can't even switch to a different VT with Ctrl-Alt-F3 so I think maybe the whole computer is hung? Not certain. [ Test case ] - Install DisplayLink drivers - Start GNOME Shell in wayland mode - Connect to a display-link dock - Expect the shell to work properly and be visible in the external device [ Regression potential ] Wayland session won't work even for standard drm devices ---- I am using the DisplayLink driver for Ubuntu provided at https://www.displaylink.com/downloads/ubuntu, which I think is the only way to get DisplayLink fully working under Ubuntu? That is, DisplayLink didn't work when I installed the evdi-dkms and libevdi0 Ubuntu packages, and I couldn't find any other packages that might be relevant (did I miss something?) so as far as I can tell the only way to get everything that's needed is from displaylink.com. I'm reporting this issue while logged in under Xorg because I can't report it when logged in with my DisplayLink monitors plugged in under Wayland, for obvious reasons. :-/ ProblemType: BugDistroRelease: Ubuntu 19.10 Package: mutter 3.34.1-1ubuntu1 ProcVersionSignature: Ubuntu 5.3.0-23.25-generic 5.3.7 Uname: Linux 5.3.0-23-generic x86_64 ApportVersion: 2.20.11-0ubuntu8.2 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Wed Nov 20 14:08:21 2019 InstallationDate: Installed on 2019-09-12 (69 days ago) InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)SourcePackage: mutter UpgradeStatus: Upgraded to eoan on 2019-09-20 (61 days ago) modified.conffile..etc.apport.crashdb.conf: [modified] mtime.conffile..etc.apport.crashdb.conf: 2019-10-23T16:51:18.143596 To manage notifications about this bug go to: https://bugs.launchpad.net/mutter/+bug/1853357/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
