The issue is pretty simple: using Nvidia X Sever Settings GUI to switch from NVIDIA GPU to Intel iGPU doesn’t work and the NVIDIA GPU does still consume some power after rebooting and, as a consequence, it generates unnecessary heat. Same thing (obviously) happens if I use prime-select from the term…

Please attach a dmesg output in intel mode after trying to use bbswitch to turn off the gpu.

out.txt (139.0 KB) Not really an expert but it seems weird that around line 1100, it seems to first switch off the gpu and then turn it back on right after that. Not sure if there is other useful stuff in that dump to understand why it is happening. Thanks again!

Might be bbswitch colliding with runtime pm. Please post the output of grep 10de /lib/udev/rules.d/*

Output before turning off the dGPU with bbswitch in Intel mode: /lib/udev/rules.d/71-nvidia.rules:SUBSYSTEM=="pci", ATTRS{vendor}=="0x10de", DRIVERS=="nvidia", TAG+="seat", TAG+="master-of-seat" /lib/udev/rules.d/71-nvidia.rules:ACTION=="bind", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=…

It seems you also have some asusd installed that interferes with power management. Please disable/uninstall it. Then move both files /lib/udev/rules.d/71-nvidia.rules /lib/udev/rules.d/90-asusd-nvidia-pm.rules to your home directory for later usage and run sudo update-initramfs -u to remove them…

Not that it really matters but I have noticed that powertop detects the GPU as a network itnerface, example: 23.7 W 0,0 pkts/s Device Network interface: wlo1 (iwlwifi)

Telling by the behaviour, it seems the acpi is broken/incompatible with linux. Please attach an acpidump

acpidump.out (2.4 MB) Here it is. I will add that Optimus works fine when I use Windows (dual boot)

For testing, please try setting kernel parameter acpi_osi=! acpi_osi="Windows 2009" and check whether bbswitch then works properly. bbswitch already loads in the disabled state, so no echo “off” should be necessary. This will likely break touchpad support or anything else, this is just for findi…

Ubuntu 20.04 - NVIDIA GPU consuming power even when using only integrated graphics card (Intel iGPU)

Graphics / Linux Linux

Tommaso95 December 7, 2021, 5:10pm 12

Tried that, unfortunately same result, switches back to ON right after setting it to OFF. I also remember I tried it once with a fresh install without asusd and it was the same thing.

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Ubuntu 20.04 - NVIDIA GPU consuming power even when using only integrated graphics card (Intel iGPU)

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