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erpalma / throttled

Workaround for Intel throttling issues in Linux.
MIT License
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Note about C-states on XPS 9370. #62

Closed cedws closed 5 years ago

cedws commented 6 years ago

This isn't a bug with the repo, but might be useful information to have for anyone passing by. On my XPS 9370, I've been seeing a lot of kernel messages complaining about thermal throttling (package/core above temperature), despite it being only 40-50 degrees. One of the widgets in my window manager was reporting the CPU temperature as 90 degrees even though it wasn't. For some reason, disabling C-states in the UEFI fixes this. I'm inclined to say it's a firmware bug.

marcolaux commented 6 years ago

This explains something. Are you on BIOS 1.5.1? Disabling C-States will disable all the CPU powersaving features so frequency scaling won't work anymore. Is that correct?

cedws commented 6 years ago

I currently have 1.4.0, and 1.5.1 is just a few IME updates, so an update is unlikely to fix anything. According to the information in the UEFI, C-states are for additional power savings during system idle or hibernation. P-states are still working and it will underclock the CPU to save power. Functionally, I've seen no difference from disabling C-states, but it's resolved all of the problems I was having.

marcolaux commented 6 years ago

Thanks for sharing. I'll have an eye on this from now on if this also happens on my machine.

marcolaux commented 5 years ago

This also doesn't happen anymore when I do a cold boot (with C-States enabled).

cedws commented 5 years ago

Closing this. I think it happens with SpeedStep still for me, but not C-states. Weird stuff. I think the kernel messages can be ignored.