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Elaman
n00b
Joined: 28 Jul 2016
Posts: 32
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 Posted: Wed Feb 20, 2019 5:53 pm Post subject: Dual GPU switching |
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I have a laptop with two graphic cards, the Intel integrated HD graphics and an AMD Radeon. I want to know which one of them is being used in my current X session and how can I switch between the two.
Apologies beforehand if this is covered on the handbook, but I couldn't find anything. I understand this is a quite common thing in laptops, and if one has a dedicated graphics card it's probably because one wants to use it.
I have followed the steps for the AMDGPU, which is the driver I use for the Radeon.
This is the full log for my X session:
https://pastebin.com/Qgaqp567
I don't really have a device configuration file nor xorg.conf as such. My only configuration files are for keyboard and mouse. |
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joanandk
Apprentice
Joined: 12 Feb 2017
Posts: 169
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| Posted: Thu Feb 21, 2019 7:59 pm Post subject: |
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Hi,
As root, please send us the output of
If you are using the opensource driver for AMD, then you should have the file "switch" under "/sys/kernel/debug/vgaswitcheroo". This file will tell you which adapter you are using:
| Code: | 0:IGD:+:Pwr:0000:00:02.0
1:DIS: :DynOff:0000:01:00.0 |
You can then switch to the dedicated by executing | Code: | | echo DDIS > /sys/kernel/debug/vgaswitcheroo/switch |
. You must log out of Xorg and log in back to use the dedicated adapter.
BE AWARE: I am not sure if your system will automatically switch the gmux correctly! If not you will have a black screen on the laptop, but the external monitor connector will work.
BR
PS: This topic is not in the Gentoo manual, as this is Linux specific issue. |
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Elaman
n00b
Joined: 28 Jul 2016
Posts: 32
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| Posted: Sun Feb 24, 2019 4:14 pm Post subject: |
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I got this working and it was surprisingly simple. I Guess I was almost there configuration-wise, but didn't know anything about PRIME.
First of all, for checking what is the card currently in use, I have added the following alias:
| Code: | alias activecard='glxinfo | grep OpenGL.renderer'
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I have the dedicated graphics card from AMD on profile 1, and Intel on 0, so for setting the GPU offload I do the following:
| Code: | xrandr --setprovideroffloadsink 1 0
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Finally, I run the applications that I want to use AMD with, as follows:
| Code: | DRI_PRIME=1 <command>
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And that was all there is to it, it seems.
I'd run some benchmarks but I already notice a pretty clear difference in performance, especially with mplayer. |
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