Fix committed for Noble, but blocked while we wait for the previous SRU
to make its way out of proposed.
** Changed in: mutter (Ubuntu Noble)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1978905
Title:
Reverse PRIME support for Wayland (Nvidia as primary GPU outputting to
Intel GPU display ports)
Status in Mutter:
Fix Released
Status in mutter package in Ubuntu:
Fix Released
Status in mutter source package in Noble:
Fix Committed
Status in mutter source package in Oracular:
Fix Released
Bug description:
[ Impact ]
Support reverse PRIME for Wayland (Nvidia as primary GPU outputting to
Intel GPU display ports). This is different to the more common dual
GPU setup where Intel is primary and Nvidia is secondary.
[ Test Plan ]
0. Requires a very specific type of desktop machine where the BIOS can
be configured to treat the Nvidia card as the primary GPU without
disabling the motherboard's integrated Intel GPU.
1. Install an Nvidia driver supported by Ubuntu using the 'Additional
Drivers' app.
2. Reboot.
3. Plug a monitor into each of the GPUs; one in the Nvidia card and
one into the motherboard.
4. Log into a GNOME Wayland session ('Ubuntu on Wayland' or just
'Ubuntu', not 'Xorg').
5. Verify BOTH monitors are illuminated and can be used.
6. As a regression test, unplug the monitor from the motherboard and
verify the "normal" single Nvidia GPU configuration continues to
function.
[ Where problems could occur ]
Since the fix affects EGL modifiers it has the potential to fix or
break behaviour of Wayland sessions in unpredictable ways, depending
on the graphics driver and GPUs in use. But the impact is limited to
GNOME Wayland sessions.
[ Other Info ]
Since Ubuntu doesn't officially recommend Wayland for Nvidia systems
until 24.10 and later, the number of users with such a configuration
on 24.04 will be small.
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