This bug was fixed in the package nvidia-settings -
470.57.01-0ubuntu3.1~0.21.10.1
---------------
nvidia-settings (470.57.01-0ubuntu3.1~0.21.10.1) impish; urgency=medium
[ Jeremy Szu ]
* debian/patches/18_remove_power-saving_if_on-demand.patch,
debian/patches/19_lp1957094-adjust-on-demand-mode-description.patch:
- Disable the item of power saving mode if on-demand is supported
(LP: #1957094).
- Leave the item there because the user might issue 'prime-select
intel' manually. Thus, leave it there could prevent selection
confuse.
- Explain the on-demand mode if driver < 450.
-- Alberto Milone <alberto.mil...@canonical.com> Tue, 18 Jan 2022
14:25:40 +0000
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https://bugs.launchpad.net/bugs/1957094
Title:
on-demand mode doesn't work with nvidia-390
Status in OEM Priority Project:
New
Status in nvidia-settings package in Ubuntu:
Fix Released
Status in ubuntu-drivers-common package in Ubuntu:
Fix Committed
Status in nvidia-settings source package in Focal:
Fix Released
Status in ubuntu-drivers-common source package in Focal:
Fix Released
Status in nvidia-settings source package in Impish:
Fix Released
Status in ubuntu-drivers-common source package in Impish:
Fix Released
Status in nvidia-settings source package in Jammy:
Fix Released
Status in ubuntu-drivers-common source package in Jammy:
Fix Committed
Bug description:
[Impact]
* In any Ubuntu series, if user using a old GPU (which supported by
nvidia-390 only) then issuing glxinfo will get "Error: couldn't find
RGB GLX visual or fbconfig". Which mean the Xorg doesn't load dri
driver correctly.
[Test Plan]
* install nvidia-390 on nvidia-390 supported system.
* prime-select on-demand
* reboot
* glxinfo
* after applying this patch, it will fall back to "ON" mode after reboot.
* install nvidia-450 on nvidia-450 supported system.
* prime-select on-demand
* reboot the system
* prime-select query (and check that on-demand mode is still in use).
[Where problems could occur]
* Since nvidia-390 doesn't support on-demand mode (RTD3 either). If a user
stays in on-demand mode with 390 without problem, the after upgrading u-d-c and
reboot. The mode will fall back to "ON" mode.
* From my point of view, it's fine because nvidia-390 doesn't support RTD3.
Thus, the nvidia will always stay in "Active" stage no matter which mode it is.
* While there is no way to inform the user about this change, changing to the
only supported default will avoid breaking GLX.
---
The regression from https://bugs.launchpad.net/ubuntu/+source/ubuntu-
drivers-common/+bug/1942789.
It impacts Jammy and Impish so far.
[Steps to reproduce]
1. Find a GPU supports nvidia-390
2. ubuntu-drivers install nvidia:390
3. prime-select on-demand
4. glxinfo
[Expected result]
Shows intel or nvidia drives monitor
[Actual result]
Error: couldn't find RGB GLX visual or fbconfig
Since we are all agree "on-demand" mode as default mode.
Pre-talk with Alberto, on-demand doesn't support with nvidia-390 (no matter
RTD3).
We could consider to make it as performance mode and leave a note on
nvidia-settings.
I'll prepare some test packages.
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