Peter Ganzhorn wrote:
After searching for possible causes for my problem I identified USB to be the problem - disconnecting all USB devices from my system will make the CPU enter C3 state a lot, about 50% with more than 20ms are reported by powertop. Unfortunately I have a usb mouse, usb keyboard und two external usb hard drives - and I don't want to miss any of them. Using USB-to-PS2 adapters may be an imperfect solution for mouse and keyboard, but the hard drives will remain an issue for sure. Is there any possible way to make the system to go to C3 with USB devices attached??? On Google I read that Microsoft released a hot-fix for Windows which is said to fix this issue, so I hope there is a way to do this with Linux as well.
as far as I know, Linux unfortunately does not support this feature (HID auto suspend) yet... I hope people are working on it; if not I might end up spending some time (or time of people working in my group ;) on it...
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