[Bug 1946434] Re: SRU: Set on-demand as default, enable RTD3 only on laptops and decouple on-demand with RTD3

[Mathew Hodson]

** Changed in: nvidia-prime (Ubuntu)
   Importance: Undecided => Medium

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Title:
  SRU: Set on-demand as default, enable RTD3 only on laptops and
  decouple on-demand with RTD3

Status in OEM Priority Project:
  Confirmed
Status in nvidia-prime package in Ubuntu:
  New

Bug description:
  [Impact]

   * Ubuntu will set GPU mode to performance as default which may use more power
   * User can't use GPU for other purpose (eg: deep-learning) if RTD3 is not supported
   * According to Nvidia README, the RTD3 doesn't support on non-laptop machine

  [Test Plan]

   * Install 20.04.3 with "Third-party packages". After the installation, reboot the system. Execute "prime-select query" should get "on-demand"
   * On non-laptop machine. Can set GPU mode to on-demand
   * On laptop with GPU in runtime PM support list. Set GPU mode to on-demand and Nvidia driver is loaded with "NVreg_DynamicPowerManagement=0x02"

  [Where problems could occur]

   * on-demand mode supported after nvidia driver 450. And focal does not have nvidia driver lower than 450.
   * With GPU supported RTD3 not able enable runtime PM on non-laptop. But based on the Nvidia README, this case shall not happened.

  [Other Info]

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