Public bug reported:
This is the same issue as originally reported in bug 1765363 but that
report is old and has a lot of extra data on it so it was requested that
a new bug be opened if we were still having the issue.
So... I am still having the issue, at least with the 390 series drivers
(my laptop has a Quadro 5400M).
Switching to Intel mode via either the GUI in nvidia-settings or via
prime-select successfully moves the rendering to the Intel card but does
not power down the discrete card, as evidenced by either power
consumption in powertop in excess of 20W, or by manually checking
/proc/acpi/bbswitch (shows ON).
Manually echoing off into /proc/acpi/bbswitch does turn the card off as
can be seen from the power consumption drop.
ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: nvidia-prime 0.8.15
ProcVersionSignature: Ubuntu 5.8.0-40.45-generic 5.8.18
Uname: Linux 5.8.0-40-generic x86_64
ApportVersion: 2.20.11-0ubuntu50.3
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sun Jan 24 19:07:10 2021
Dependencies:
InstallationDate: Installed on 2021-01-24 (0 days ago)
InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022)
PackageArchitecture: all
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: nvidia-prime
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: nvidia-prime (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug groovy
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https://bugs.launchpad.net/bugs/1912974
Title:
discrete card not powered down in Intel mode with legacy drivers
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