https://bugzilla.kernel.org/show_bug.cgi?id=60606
--- Comment #1 from Sebastien Fievet sebastien.fievet@free.fr --- I did proofread my report, but missed a obvious mistake :
cat /sys/kernel/debug/vgaswitcheroo/switch 0:IGD:+:Pwr:0000:00:02.0 1:DIS: :Pwr:0000:02:00.0 2:DIS-Audio: :Pwr:0000:02:00.1
echo OFF > /sys/kernel/debug/vgaswitcheroo/switch cat /sys/kernel/debug/vgaswitcheroo/switch 0:IGD:+:Pwr:0000:00:02.0 1:DIS: :Off:0000:02:00.0 2:DIS-Audio: :Off:0000:02:00.1
all apologies.