[Bug 1942789] [NEW] On-demand and RTD3 need to be separated

[Launchpad Bug Tracker]

You have been subscribed to a public bug by jeremyszu (os369510):

[Steps to reproduce]
1. Install 20.04.3 with "Third-party packages" on a system which containing a RTD3 supported nvidia card.
2. After the installation, press enter to reboot system
3. prime-select query

[Expected result]
on-demand

[Actual result]
performance

---

It's because ubiquity launches `ubuntu-drivers install --packages-list
...` in live system but install each package to target storage.

When installing nvidia-prime, the preinst set "on" to "/etc/prime-
discrete" which will be referred by gpu-manager. The gpu-manager will
set to performance mode.

After confirming with Alberto on Mattermost, since we don't have a
nvidia driver which lower than 450 version since focal.

I think we are ok to switch to on-demand mode.

---

[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 Ubuntu, and then execute 'ubuntu-drivers install' to install GPU driver. After the installation, reboot the system. Execute "prime-select query" should get "on-demand"
 * Old GPU (which supported by nvidia-390 only) will keep in performance mode, refer LP:1957094. Execute "prime-select query" should get "nvidia"
 * 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]

 * 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]

Changelogs:

nvidia-prime (0.8.16~0.20.04.2) focal; urgency=medium

  [ Jeremy Szu ]
  * Set on-demand mode as default nvidia mode (LP: #1942307)

  [ Alberto Milone ]
  * prime-select:
    - Detect chassis type and enable RTD3 only
      on laptops (LP: #1942788).
    - on-demand mode doesn't need to depend on
      RTD3 (LP: #1942789).
    - Use bootvga detection when last_gfx_boot
      is not available.
    - Don't check the current profile when setting
      a profile (LP: #1946476).
    - Catch BrokenPipeError.
    - Use bootvga detection when last_gfx_boot is
      not available.

nvidia-prime (0.8.16.2~0.21.04.1) hirsute; urgency=medium

  [ Jeremy Szu ]
  * Set on-demand mode as default nvidia mode (LP: #1942307)

  [ Alberto Milone ]
  * prime-select:
    - Detect chassis type and enable RTD3 only
      on laptops (LP: #1942788).
    - on-demand mode doesn't need to depend on
      RTD3 (LP: #1942789).
    - Use bootvga detection when last_gfx_boot
      is not available.
    - Don't check the current profile when setting
      a profile (LP: #1946476).

** Affects: oem-priority
     Importance: High
     Assignee: Dirk Su (dirksu)
         Status: Confirmed

** Affects: nvidia-prime (Ubuntu)
     Importance: High
     Assignee: Alberto Milone (albertomilone)
         Status: Fix Released

** Affects: nvidia-prime (Ubuntu Focal)
     Importance: Undecided
     Assignee: Alberto Milone (albertomilone)
         Status: Incomplete

** Affects: nvidia-prime (Ubuntu Hirsute)
     Importance: Undecided
     Assignee: Alberto Milone (albertomilone)
         Status: Invalid


** Tags: oem-priority
-- 
On-demand and RTD3 need to be separated 
https://bugs.launchpad.net/bugs/1942789
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