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Disable discrete graphics card (Nvidia)

From: Pierre Neidhardt
Subject: Disable discrete graphics card (Nvidia)
Date: Wed, 04 Apr 2018 12:53:25 +0530
User-agent: mu4e 1.0; emacs 25.3.1

I run a Xiaomi Air 13 with both an embedded Intel and a discrete Nvidia
graphics chipset.  I'd like to turn off the Nvidia chipset to save
battery power and avoid overheating (I live in a hot place).

Blacklisting the "nouveau" kernel module prevents the card from being
seen by the OS, but the card keeps draining power:

     (kernel-arguments '("modprobe.blacklist=nouveau"))

It seems that neither acpi_call nor bbswitch are packaged with Guix.
Is there any other commended way?

Pierre Neidhardt

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