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stahlsau
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PostPosted: Fri Oct 04, 2019 8:23 am    Post subject: power management / fan control / cpu frequencies - how is it Reply with quote

Servus,

I couldn't find what I search for on the forums or wiki, if i missed THE post, please post a link - sorry.

I wondered why my fans are running way louder (->faster) than under windows, and then checked for cpu-frequency and power states and so on. It's a normal pc, no laptop.

As far as i understood, all that stuff is controlled by bios / uefi when running linux normally, is this correct? Then probably under windows, some other system like msi-software will take care of that, changes some values. Under linux, will some values be altered by userspace programs without me knowing? Sry, probably a newbee question, I wasn't on linux for about 10 years ;-)

cpu-frequencies are changing, values ok, so this is working, i suppose. Regarding power saving states - no idea where to look..
lm-sensors does only find PCI and wifi...tis a bit too few, i guess.

Kernel from genkernel by now - too much new hardware for me to get everything configured myself. Just added some filesystems n stuff with menuconfig. I'm still working on a complete manual config.

TIA
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xanderal
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Joined: 06 Mar 2019
Posts: 129
Location: Germany

PostPosted: Fri Oct 04, 2019 1:12 pm    Post subject: Reply with quote

stahlsau wrote:
I couldn't find what I search for on the forums or wiki, if i missed THE post, please post a link - sorry.
[...]
cpu-frequencies are changing, values ok, so this is working, i suppose. Regarding power saving states - no idea where to look..
lm-sensors does only find PCI and wifi...tis a bit too few, i guess.
Have you read:Power management/Processor
Power management/Guide
how should new cpupower be used
CPU frequency scaling
Fan is running at the same speed constantly
EDIT: Reducing fan speed
EDIT: Fan Speed Issue (reddit)
(just an uncreative list from searching for a minute - don't know which ones you already found)?
stahlsau wrote:
I wondered why my fans are running way louder (->faster) than under windows, and then checked for cpu-frequency and power states and so on. It's a normal pc, no laptop.
For one windows has a bigger market share, so more money in development and therefore it could be that the drivers you use on windows are just better than the ones you use on linux.
stahlsau wrote:
Kernel from genkernel by now - too much new hardware for me to get everything configured myself. Just added some filesystems n stuff with menuconfig. I'm still working on a complete manual config.
That's something I would definitely recommend (making your own custom kernel). And it doesn't really need to take that much time. Just google the wiki entries on usb, wifi, sound, etc. what you already know you definitely need and add the modules that are recommended. Most likely it won't take longer than a few hours.
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stahlsau
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Joined: 09 Jan 2004
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Location: WildWestwoods

PostPosted: Fri Oct 04, 2019 2:25 pm    Post subject: Reply with quote

thanks for the answer.
I've seen those wiki pages and did "that", at least the parts that made sense to me (it's quite intel-specific, and since i use AMD and not a laptop, some things are irrelevant i think [laptop-mode et al])

My guess is: the fans are not controlled by linux, but by bios - is this correct?
(since i don't run fancontrol or something)
Then I'd adjust the thresholds in bios - i'm at ~35°C atm, no need for high fan rpm.

Second: the cpu cores are switching all the time between 3000 and 4000 MHz without any load. They (or most of them) should stay at about 2000 without load. I'll try to figure out what's causing this (maybe with powertop?), maybe there's something wrong...
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stahlsau
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Joined: 09 Jan 2004
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Location: WildWestwoods

PostPosted: Sat Oct 05, 2019 11:09 am    Post subject: Reply with quote

seems to be mostly fixed...i probably missed some kernel option or something. Following the values from the wiki worked, cores running between ~2000 and ~3000 when idle.
Fans are slower now, too. Thanks!
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