I think I understand the error. Sorry for my English.
Ubuntu 18.04. After installing nvidia drivers, nouveau modules are added to the
modprobe blacklist. The path /sys/kernel/debug/vgaswitcheroo/switch disappears.
To turn off the nvidia graphics card, prime-select creates a symlink in
After installing the switcheroo-control package, I got the same output as the
Amir
But the discrete graphics card does not turn off. The fan rotates, the power
consumption is at a high level.
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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
Correction. I run command of Alain Rouet (alain-rouet):
# sed -i "s/boot_params\['nouveau.runpm'\] = '0'/boot_params\['nouveau.runpm'\]
= '-1'/" /usr/bin/prime-select
And output of the coomand cat /sys/kernel/debug/vgaswitcheroo/switch was
different. Now it's:
0:IGD:+:Pwr::00:02.0
1:DIS:
And more. Different output of the command: cat
/sys/kernel/debug/vgaswitcheroo/switch
nouveau driver:
0:IGD:+:Pwr::00:02.0
1:DIS: :DynOff::01:00.0
nvidia 390.48, after prime-select intel:
0:IGD:+:Pwr::00:02.0
1:DIS: :Off::01:00.0
You can see the different status of the discrete
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