Cosminovici
n00b
Joined: 12 Aug 2024
Posts: 1
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 Posted: Mon Aug 12, 2024 6:51 am Post subject: [Solved] GPU no longer supports D3cold |
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Hello,
I come to you with an utmost baffling dilemma.
I recently reinstalled Gentoo on my optimus laptop and whilst setting up the Nvidia driver I noticed RTD3 no longer worked as intended, i.e. the GPU no longer entered D3cold state when not in use. The GPU was able and it often did go into D3cold on my previous installation.
After trying several driver versions and reading the same forum threads and documentation one hundred times over, I was able to resolve that, for once, the Nvidia driver was not the issue. I came across this in the kernel log:
| Code: | | [ 0.450611] pci 0000:01:00.0: PME# supported for D0 D3hot |
The PCI device in question is my dedicated Nvidia GPU. Somewhere along the way, it lost the ability to go cold.
Before reinstalling Gentoo, I also decided to update my BIOS, but I am unable to determine when, relative to this update, this issue appeared. I have already tried reverting to the previously installed BIOS version, but to no avail. I have also tried an older kernel, thinking this may be a kernel bug in the new kernel I am using post reinstall, but that wasn't it either.
Does anyone have ANY ideea what could have POSSIBLY happened to my GPU?
EDIT: I figured out the issue. It was caused by a faulty kernel config. The Nvidia HDMI audio PCI device prevented the GPU from going cold. Somewhat confusingly, setting CONFIG_VGA_SWITCHEROO solved this. I assume this is necessary for all optimus laptops, so adding this to the wiki under the RTD3 section of the Nvidia article would be helpful to others who may face this issue. |
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Kernel & Hardware
