This bug was fixed in the package nvidia-prime - 0.8.16~0.20.04.2
---------------
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).
- Don't check the current profile when setting
a profile (LP: #1946476).
- Handle BrokenPipeError (LP: #1965520).
-- Alberto Milone <alberto.mil...@canonical.com> Thu, 28 Oct 2021
16:40:04 +0200
** Changed in: nvidia-prime (Ubuntu Focal)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1942307
Title:
ubiquity uses performance mode for nvidia driver
Status in OEM Priority Project:
Confirmed
Status in nvidia-prime package in Ubuntu:
Fix Released
Status in nvidia-prime source package in Focal:
Fix Released
Status in nvidia-prime source package in Hirsute:
Won't Fix
Bug description:
[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).
- Don't check the current profile when setting
a profile (LP: #1946476).
- Handle BrokenPipeError (LP: #1965520).
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