** Changed in: ubuntu-drivers-common (Ubuntu Jammy)
Status: Triaged => In Progress
** Changed in: ubuntu-drivers-common (Ubuntu Noble)
Status: Triaged => In Progress
** Also affects: linux-hwe-6.8 (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux-hwe-6.8 (Ubuntu)
Status: New => Won't Fix
** No longer affects: linux-hwe-6.8 (Ubuntu Jammy)
** No longer affects: linux-hwe-6.8 (Ubuntu Noble)
** No longer affects: linux-hwe-6.8 (Ubuntu Oracular)
** Tags added: regression-update
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https://bugs.launchpad.net/bugs/2083329
Title:
Backport the Nvidia/SimpleDRM kernel 6.11 (and 6.8.0-51) fix for
phantom displays
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:
In Progress
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.
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