Confirm on Lenovo ideapad 520S-14IKB (Intel i5-7gen, Nvidia 940MX , Intel 620HD). On Ubuntu 17.10 (Nvidia driver 390.48 from ppa:graphics-drivers/ppa ppa:graphics-drivers/ppa) prime-select worked fine. On Ubuntu 18.04 prime-select not turn off nvidia (driver from ppa and driver from repository). Nouveau and bumblebee switches the graphics card well.
I noticed a different output of the command: cat /sys/kernel/debug/vgaswitcheroo/switch nouveau driver: 0:IGD:+:Pwr:0000:00:02.0 1:DIS: :DynOff:0000:01:00.0 nvidia 390.48, after prime-select intel: 0:IGD:+:Pwr:0000:00:02.0 1:DIS: :Off:0000:01:00.0 You can see the different status of the discrete card. When "DunOff" it really disconnected from the power supply, and in case of "Off" it continues to consume energy. If it matters. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to nvidia-prime in Ubuntu. https://bugs.launchpad.net/bugs/1765363 Title: prime-select intel is not powering off the nvidia card Status in nvidia-prime package in Ubuntu: Confirmed Bug description: Right now, it seems that prime-select intel makes sure the nvidia driver is not loaded, as nvidia-settings reports. But my power consumption is > 20W. cat /proc/acpi/bbswitch reports the card is still on. If bbswitch and powertop are reliable, then the nvidia card is still powered. This is a thinkpad w520 in Optimus mode. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: nvidia-prime 0.8.7 ProcVersionSignature: Ubuntu 4.15.0-15.16-generic 4.15.15 Uname: Linux 4.15.0-15-generic x86_64 ApportVersion: 2.20.9-0ubuntu5 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Thu Apr 19 19:56:21 2018 Dependencies: EcryptfsInUse: Yes InstallationDate: Installed on 2017-12-14 (125 days ago) InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018) PackageArchitecture: all SourcePackage: nvidia-prime UpgradeStatus: Upgraded to bionic on 2018-03-09 (41 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-prime/+bug/1765363/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
