NVIDIA vgaswitcheroo doesn't work

[carachi diego <carachi83@xxxxxxxxx>]

Hello,

I installed yesterday on my laptop the last version of Fedora with 3.12.8 kernel.

However I discover that the discrete GPU (NVIDIA GT520M) remain always on, reducing battery performance.

I tried to switch it off but seem that vgaswitcheroo doesn't work on it.

How can I solve this problem?

here some commands:

[root@Fedora20 ~]# lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
01:00.0 VGA compatible controller: NVIDIA Corporation GF119M [GeForce GT 520M] (rev a1)
[root@Fedora20 ~]# cat /sys/kernel/debug/vgaswitcheroo/switch
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :DynPwr:0000:01:00.0
[root@Fedora20 ~]# echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
[root@Fedora20 ~]# cat /sys/kernel/debug/vgaswitcheroo/switch
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :DynPwr:0000:01:00.0
[root@Fedora20 ~]# uname -a
Linux Fedora20 3.12.8-300.fc20.x86_64 #1 SMP Thu Jan 16 01:07:50 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

Thank you very much

C.

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