Hi Timo, This does not fix the issue for me (assuming its the same issue). I have a phantom duplicate display shown for each of my external monitors which only occurs when I use a thunderbolt cable to my Apple Studio Display (27¨) or a similar cable (OWC Thunderbolt) my Lenovo p27-10u 4K display. When i switch out cables for standard USB-C 3.1 cables, all works fine and no phantom monitors show. I have tried only one monitor on USB-C and one on Thunderbolt as well and only the Thunderbolt connected monitor has the phantom problem.
This behaviour is consistent before and after testing with the updated ubuntu-drivers-common/1:0.9.7.6ubuntu3.2 patch which is proposed. I tested this before and after subsequently installing nvidia-driver-535 (although Iḿ not sure what NVIDIA has to do with my system with intel integrated graphics). My system is a Lenovo T14s (Gen 5) Intel. (Intel Arc Graphics) + LUKS encryption. I have very limited time today but see you provided some links above. Happy to provide any more info / logs etc if helpful. I could not find another bug relating to thunderbolt but am happy to log one if this is a different issue as it was unclear to me whether thunderbolt has been taken into consideration with this issue. I would appreciate your guidance whether my scenario is related and what my next steps should be to help. Thanks, Aaron -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-hwe-6.8 in Ubuntu. https://bugs.launchpad.net/bugs/2083329 Title: [regression] [nvidia] Phantom "Unknown Display" shown in Settings since kernel 6.11 and 6.8.0-51 Status in linux-hwe-6.8 package in Ubuntu: Won't Fix Status in ubuntu-drivers-common package in Ubuntu: Fix Released Status in ubuntu-drivers-common source package in Jammy: In Progress Status in ubuntu-drivers-common source package in Noble: Fix Committed Status in ubuntu-drivers-common source package in Oracular: Fix Released Bug description: [ Impact ] Backport the Nvidia/SimpleDRM kernel 6.11 fix for phantom displays. This is a continuation of bug 2060268 where kernel 6.11 was found to require a different fix from that shipped for 6.8. Update: 6.8.0-51 has regressed in the same way as 6.11 did. [ Test Plan - Nvidia desktop ] 1. Set up a DESKTOP where the only GPU enabled is an Nvidia one. 1. Apply all updates and verify that the running kernel is 6.8.0-51 or later 2. Open the 'Additional Drivers' app to install a supported Nvidia driver. 3. Reboot and verify the Nvidia driver is now active (lspci -k should mention 'nvidia' and not 'nouveau'). 4. Log-in to a GNOME Xorg session 5. Open Settings and verify the only monitors shown are your real monitors. 6. Log-in to a Wayland session 7. Open Settings and verify the only monitors shown are your real monitors. [ Regression Test Plan - Nvidia Hybrid graphics ] 1. Set up a machine with Nvidia hybrid graphics (one discrete Nvidia GPU and one Intel/AMD integrated GPU) 2. Apply all updates and verify that the running kernel is 6.8.0-51 or later 3. Open the 'Additional Drivers' app to install a supported Nvidia driver. 4. Reboot and verify the Nvidia driver is now active (lspci -k should mention 'nvidia' and not 'nouveau'). 5. Verify that `ls /dev/dri/card*` lists exactly two files. [ Regression Test Plan - Intel/AMD graphics ] 1. Set up a machine with integrated graphics only. 2. Apply all updates and verify that the running kernel is 6.8.0-51 or later 3. Verify that you are able to log into the Ubuntu Desktop Wayland session. 4. Run `apt install nvidia-driver-535`. 5. Reboot. 6. Verify that you are able to log into the Ubuntu Desktop Wayland session. [ Regression Test Plan - Virtual machines ] 1. Set up a virtual machine without any graphics acceleration (vmware, virtio...) 2. Apply all updates and verify that the running kernel is 6.8.0-51 or later 3. Verify that you are able to log into the Ubuntu Desktop Wayland session. 4. Run `sudo apt install nvidia-driver-535`. 5. Reboot. 6. Verify that you are able to log into the Ubuntu Desktop Wayland session. 7. Optionally go back to point 4, and try with nvidia-driver-550. [ Regression Test Plan - Nvidia+LUKS ] 1. Set up a desktop machine (not a laptop) with an Nvidia GPU and encrypted disk. 2. Apply all updates and verify that the running kernel is 6.8.0-51 or later 3. Open the 'Additional Drivers' app to install a supported Nvidia driver. 4. Reboot 5. Verify that you see the password prompt for decrypting the disk. [ Where problems could occur ] Removing the simpledrm card is only safe when it's not being used. If somehow a machine wasn't using the installed Nvidia driver then there could be a risk of deleting the only working display. One case where this could happen is if the Nvidia driver would allow being loaded even without any nvidia hardware present: if that is the case, "Regression Test Plan - Virtual machines" would fail. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-hwe-6.8/+bug/2083329/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
