Dual graphics - laptop

[dikudize]

Hello,
I have an ASUS TUF laptop with AMD integrated and AMD discrete graphics. I want to know if there is a method to fully disable the discrete graphics in the laptop for power saving. or.. Maybe the discrete graphics if there is no graphic workload is almost down and off?
I am asking because in windows I get 10 hours of battery and in Linux less than a half. I don't know the cause yet, but I don't think the problem is in the CPU..

[agd5f]

The dGPU will be powered down automatically when it's not in use by runtime power management. The iGPU will dynamically powergate most blocks on the GPU when they are idle.

[davpal]

Hello,
I have an asus fx505dy and even though the dgp seems disabled

0DIS: DynOff: 0000: 01: 00.0
1: IGD-Audio: DynOff: 0000: 05: 00.1
2: IGD: +: Pwr: 0000: 05: 00.00 DIS: DynOff: 0000: 01: 00.0
1: IGD-Audio: DynOff: 0000: 05: 00.1
2: IGD: +: Pwr: 0000: 05: 00.0

still consumes energy

amdgpu-pci-0100
Adapter: PCI adapter
vddgfx: 1.10 V
edge: + 42.0 ° C (critical = + 94.0 ° C, hyst = -273.1 ° C)
power1: 14.11 W (capacity = 48.00 W)

I can reduce the power consumption a little bit, around 3W, using corecrtl to force use only the lowest states or even a little bit more by filtering the dgpu pci id on boot but never disabling it completely and the consumption is greater than 8-9W.

[agd5f]

When you read the power from the device, the device is powered up to query that information.

[davpal]

Hello,
The data are consistent with that obtained at the battery or wall outlet using a power meter.
I have also confirmed with glmark2 and with games that the integrated card is being used and the consumption of the dgpu while playing continues to be around 10-14W.
On windows the idle consumption is much lower so it seems that technically it is possible to deactivate it.
thank you,

[agd5f]

If you are querying the power from the dGPU regularly, it will wake the card every time you read it. It will be powered down when not in use.

[davpal]

Hi,
It seems that the 5.10 kernel is going to be as good as the 5.8 for this laptop.

https://www.phoronix.com/scan.php?pa...wer-Management

davpal@julien:~$ uname -a
Linux julien 5.9.0-next-20201016 #2 SMP Sat Oct 17 05:50:20 CEST 2020 x86_64 x86_64 x86_64 GNU/Linux
davpal@julien:~$ upower -i /org/freedesktop/UPower/devices/battery_BAT0 | grep energy-rate
energy-rate: 5,803 W

and now fans are stopped. Silent on idle and some hour of battery for free.
Thanks to Lukas Wunner,