Kiwi Linux
nvidia-prime package

  1. Bug #1765363
  2. Comment #23

Comment 23 for bug 1765363

Revision history for this message
Артем (givespam) wrote :

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.