** Description changed:
- Reverse PRIME support for Wayland (Nvidia as primary GPU outputting to
- Intel GPU display ports)
+ [ Impact ]
- This is different to the usual dual GPU setup where Intel is primary and
- Nvidia is secondary.
+ 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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https://bugs.launchpad.net/bugs/1978905
Title:
Reverse PRIME support for Wayland (Nvidia as primary GPU outputting to
Intel GPU display ports)
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