I've a following problem - I've just upgraded from 13.10 to 14.04 on my Dell Vostro 3350 and I can't turn off the discrete graphics. As instructed here and following HybridGraphics I managed to permanently turn off my secondary Radeon graphics in 13.10, though now the same operation doesn't work. After enabling the vgaswitheroo
and typing in terminal cat /sys/kernel/debug/vgaswitcheroo/switch
output looks like this
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :DynOff:0000:01:00.0
instead of
0:DIS: :Off:0000:01:00.0
1:IGD:+:Pwr:0000:00:02.0
I saw in 13.10. The effect is exactly the same as if discrete graphics is on, laptop is loud and terribly overheats. Typing sudo echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
gives no effect, output of cat /sys/kernel/debug/vgaswitcheroo/switch
doesn't change. I tried some additional commands, like suggested in this post, didn't help thought. 14.04 installation is brand new, this was the first thing I tried to set up, so my guess I miss something, no idea what though. I would appreciate some help with this issue, as it increases temperatures detected by sensors
by almost 20 degrees compared to those with discrete graphics off, which, well, is defiantly not good for the hardware.
Thanks!
echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
exit 0
in rc.local gives
0:DIS: :DynOff:0000:01:00.0 1:IGD:+:Pwr:0000:00:02.0
no changes.
– Voii Apr 20 '14 at 09:01