Arch Linux

wil93

Member

From: Italy

Registered: 2013-09-15

Posts: 72

Trying to turn off Radeon HD 7730M (or even better: enable switching)

I'm following this wiki article. I have two video cards:

$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Chelsea LP [Radeon HD 7730M]

I think that the latter is powered on, because:

1. Battery duration is 1h30m or less

2. You can see "DynPwr" instead of "DynOff":

   # cat /sys/kernel/debug/vgaswitcheroo/switch
   0:DIS: :DynPwr:0000:01:00.0
   1:IGD:+:Pwr:0000:00:02.0

   (by the way: does that '+' sign implies that I'm "running" on the IGD card?)
   The wiki says that I can turn off discrete graphics by issuing this command:

   # echo OFF > /sys/kernel/debug/vgaswitcheroo/switch

   but it seems to have no effect ("DIS" stays "DynPwr")

3. By issuing "sensors" I get a quite high temperature for the discrete card:

   $ sensors
   radeon-pci-0100
   Adapter: PCI adapter
   temp1:        +53.0°C  (crit = +120.0°C, hyst = +90.0°C)
   
   coretemp-isa-0000
   Adapter: ISA adapter
   Physical id 0:  +53.0°C  (high = +87.0°C, crit = +105.0°C)
   Core 0:         +53.0°C  (high = +87.0°C, crit = +105.0°C)
   Core 1:         +51.0°C  (high = +87.0°C, crit = +105.0°C)
   Core 2:         +52.0°C  (high = +87.0°C, crit = +105.0°C)
   Core 3:         +49.0°C  (high = +87.0°C, crit = +105.0°C)

   or is this normal?

So... Is my discrete graphics card switched on? If it is, how do I switch it off?

Last edited by wil93 (2014-05-26 17:54:24)