How can I disable Hyprland from using discrete gpu?

[So1aric]

I want to disable the Nvidia gpu for lower power comsumption. How can I tell Hyprland to only use integerated gpu?
I enabled rtd3 like what the arch wiki said, but my card isn't turned off. I guess maybe it's hyprland that blocks it from turnning off?

[izmyname]

env = AQ_DRM_DEVICES,/dev/dri/cardX where cardX - your igpu, then reboot. To check which gpu is which - consult the wiki https://wiki.hyprland.org/Configuring/Multi-GPU/

[So1aric]

Doesn't work :(

[izmyname]

What's your gpu, btw? And what's the output of cat /proc/driver/nvidia/gpus/your card id, the only one dir here/power ?

[So1aric]

4060 mobile. the output is:

Runtime D3 status:          Enabled (fine-grained)
Video Memory:               Active

GPU Hardware Support:
 Video Memory Self Refresh: Supported
 Video Memory Off:          Supported

S0ix Power Management:
 Platform Support:          Supported
 Status:                    Disabled

[izmyname]

I'm out of ideas, sorry.

[So1aric]

That's alright, thanks for you help!

[gulafaran]

for what its worth i had same issue when it was still wlroots based on this 4080 dgpu

[So1aric]

What about now? I heard that hyprland already dropped wlroots dependency, right?

[gulafaran]

yeah what i meant is my nvidia dgpu has been awoken by both wlroots and now aquamarine even with forcing various env vars. kde/kwin does something different as it can keep it off

[So1aric]

I switch to hyprland-git, and it successfully uses iGPU!
But still, something blocks nvidia from turning off. When I'm in tty, the dGPU automatically turned off, but in Hyprland, although there's no process using the gpu, the card wasn't turned off.

[So1aric]

Oops. It's mpvpaper running that cause the block. My fault.
But nvidia-smi doesn't list it under the 'Processes' section....Is it because nvidia-smi only list graphic applications by default?

[gulafaran]

thats interesting, so i might be having some rogue thing keeping my gpu awake aswell that isnt listed or hyprland? :o how did you figure that out?

[So1aric]

I was thinking that will there be anything using the gpu, and I recalled that I saw mpvpaper depend on cuda in some versions, so I just kill it and, as luck would have it, the card got turned off.

[So1aric]

I'm not totally sure about that. I'm trying more tests.

[izmyname]

Interesting enough, my novideo gpu can suspend only, if the laptop is on the battery mode - but it wasn't the case, until I reinstalled my arch recently. Before that, my dgpu could suspend even when my laptop was plugged in.

[So1aric]

Oops I see you mentioned about this in the aquamarine repo
#6608 (comment)

[izmyname]

Oops I see you mentioned about this in the aquamarine repo #6608 (comment)

It's not related to your problem. Before the change to aquamarine, I symlinked my /dev/dri/card1 to .config/hypr/igpu and used this symlink as WLR_DRM_DEVICES value. When first released, aquamarine didn't support symlinks and Hyprland crashed on my PC, until I changed AQ_DRM_DEVICES value to /dev/dri/card1 instead of the symlink.

Aquamarine supports symlinks now, btw.