How can I disable discrete AMD GPU on boot?

[TQ1]

I'd like to disable the discrete AMD Radeon card on my ThinkPad E580 on boot & only use the built-in Intel graphics. I am running Qubes 4.0.3 on UEFI boot - it is not an installation problem - everything runs fine, I just want to reduce power/increase battery.

I couldn't find anything in the documentation explicitly explaining how to do this. I think it would be good to have some documentation on how to disable AMD or Nvidia discrete gpus on dual or hybrid systems.

[Günter Zöchbauer]

On Monday, February 3, 2020 at 3:25:51 PM UTC+1, TQ1 wrote:

I'd like to disable the discrete AMD Radeon card on my ThinkPad E580 on boot & only use the built-in Intel graphics. I am running Qubes 4.0.3 on UEFI boot - it is not an installation problem - everything runs fine, I just want to reduce power/increase battery.

I couldn't find anything in the documentation explicitly explaining how to do this. I think it would be good to have some documentation on how to disable AMD or Nvidia discrete gpus on dual or hybrid systems.

Perhaps  https://github.com/Qubes-Community/Contents/blob/master/docs/customization/windows-gaming-hvm.md#grub-modification

 I'm new to Qubes, so check for yourself first if this is what you want to do.

[Frank]

On 3. Feb 2020, at 15:25, 'TQ1' via qubes-users qubes...@googlegroups.com  wrote:



I'd like to disable the discrete AMD Radeon card on my ThinkPad E580 on boot & only use the built-in Intel graphics. I am running Qubes 4.0.3 on UEFI boot - it is not an installation problem - everything runs fine, I just want to reduce power/increase battery.

I couldn't find anything in the documentation explicitly explaining how to do this. I think it would be good to have some documentation on how to disable AMD or Nvidia discrete gpus on dual or hybrid systems.

This isn’t exactly a Qubes problem. ;-)

If you want your discrete GPU not to use any power, you will have to switch it off in your BIOS-Settings! The OS can’t help you with that. That’s why you won’t find anything in the docs about it.

Regards, Frank

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