Modernise hybrid GPU management (T10519)

Ikey Doherty (@ikeycode), 2023-05-03 11:58:12 UTC

linux-driver-management will be brought back to life with a number of small changes.
The existing implementation predates widespread adoption (and viability) of glvnd, thus forces uses onto the dGPU when proprietary
drivers are installed, resulting in reduced efficiency.

• Default to iGPU in xorg.conf

• Support switcheroo-control compatibility:

  • Symlink for supporting list and launch commands
  • Expose same D-BUS service, using the working logic of LDM

• Implement launching using env vars:

  • NVIDIA: __VK_LAYER_NV_optimus=NVIDIA_only __GLX_VENDOR_LIBRARY_NAME=nvidia __NV_PRIME_RENDER_OFFLOAD=1
  • Intel/AMD: DRI_PRIME=1

• Test integration with GNOME

• Investigate Plasma integration work

• Ensure Budgie compatibility

• Document the launch commands for other desktops

• Potentially integrate into Brisk Menu for MATE

• Investigate Caja compat.

• Investigate whether we need to forcibly enable PRIME_SYNCHRONIZATION in ldm-session-init, otherwise drop these integrations.

• Test @TraceyC77 and @ikeycode laptops

• Get AMD testers (@ermo ?)

Unknown: MATE desktop

Start by reading the existing linux-driver-management implementation and the ldm-session-init entry point mentioned in the issue. Review the xorg.conf, switcheroo-control, and desktop-integration requirements, then determine which checklist items are in scope. Done requires agreed behavior for iGPU defaults, launch commands, and supported desktop environments, with integration testing documented.