Ryzen 5 strange frequency states

dumi · Posted: Mon May 21, 2018 8:03 pm Post subject: Ryzen 5 strange frequency states

Hi, a bought new acer Nitro 5 notebook with Ryzen CPU (see below).

Ant P. · Watchman Joined: 18 Apr 2009 Posts: 6920

Can you install/run "cpupower frequency-info" and post the output before and after unplugging the AC? It sounds like some power management script is setting the cpu to powersave, which is more or less useless on a modern system.

dumi · Posted: Tue May 22, 2018 4:15 am Post subject:

Thanks for reply.

i'm not having notebook with me, i will post output later.

But kernel is without cpufreq drivers, cpupower reports no frequency info.

i tried install all kernel cpufreq drivers with no change, without the drivers too. I think cpufrequency scaling is not the problem. With older kernel it works fine with same software installed.
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dumi · Posted: Tue May 22, 2018 6:38 pm Post subject:

cpupower output before disconnection AC adapter

dumi · Posted: Tue May 22, 2018 6:58 pm Post subject:

I have new information.

On first boot (after pressing power button, notebook in off state), system boots with low frequency (no matter if adapter is connected). I need to reboot it to get full frequency, Power off and turn on doesnt help. Only reset.

Strange is, that is not needed to boot the system, reset on grub loader screen help too.

Summary:

1] turn On PC
2] booting system
3] frequency low
4] reboot
5] booting system
6[ frequency high (but floating)

OR

1] turn on PC
2] pres ctrl+alt+delete (reboot) on grub screen
3] booting system
4] frequency high (but floating)

Very strange for me. It's look like it is a hardware issue, and the old kernel can fix it, but old kernel does not suppor VEGA so it is unusable for me

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Goshanecr · Apprentice Joined: 17 Aug 2005 Posts: 158 Location: Russia

Maybe there is a BIOS update for Your laptop?

dumi · Posted: Wed May 23, 2018 7:00 am Post subject:

I didnt found anything about bios update on this model :-/

Today i will test this on debian live CD.
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Anon-E-moose · Posted: Wed May 23, 2018 9:56 am Post subject:

I've noticed screwy frequency results being posted since I've upgraded to 4.14 kernel.
I don't think the cpu is behaving badly, it's the reporting (from the kernel) that's screwy.

Not sure if that is what's going on with your system.
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dumi · Posted: Wed May 23, 2018 11:20 am Post subject:

screwy frequency isnt problem, computing power is good. But iuf i disconnect AC adapter frequency drop tro 398MHz and computer works very slowly, so frequency realy drops to this value.

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Anon-E-moose · Posted: Wed May 23, 2018 11:51 am Post subject:

why are you using the performance governor instead of either ondemand or conservative ?

The drop in cpu freq drop may be bios related, because that cpu isn't supposed to run at that low frequency.
--> hardware limits: 1.60 GHz - 2.00 GHz <--
or it's some screwy bug between the governors, cpupower and the bios.

Edit to add: the only thing I can recommend is to not use cpupower to change things and see if the problem persists.
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gcc 13, profile 17.0 (custom bare multilib), openrc, wayland

dumi · Posted: Wed May 23, 2018 12:11 pm Post subject:

performance governor isnt problem, same happens if i use userspace, ondemand etc.

I try to install all of them, disable cpufreq support, no change. i think problem isn't in frequency scaling. With complete disabled cpu scaling problem persist. May the bios/efi relatet problem as you said. But kernel version matter becaus on 4.9.x all works perfect

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dumi · Posted: Wed May 23, 2018 12:54 pm Post subject:

new information:

on kernel 4.19. /proc/cpuinfo returns:

[code] address sizes: 43 bits physical, 48 bits virtual[/code]

onkernel 4.9 returns
[code]address sizes: 48 bits physical, 48 bits virtual[/code]

maybe it can help to discover where is problem...
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krinn · Watchman Joined: 02 May 2003 Posts: 7470

For what is it worth (maybe just to know you are not alone?) see https://forums.gentoo.org/viewtopic-t-1076990.html
why that link?
ryzen 5
work with 4.9
fail with 4.15 (and you 4.19)
Must be a regression then

Anon-E-moose · Posted: Wed May 23, 2018 4:23 pm Post subject:

I would check the bios settings and see if one of them isn't causing the problem.

I have an acer and there isn't much that can be changed in the bios, BUT I did glance at asus swift 3 and it does have some settings for powersaving, etc.
Play around with them.
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PRIME x570-pro, 3700x, 6.1 zen kernel
gcc 13, profile 17.0 (custom bare multilib), openrc, wayland

dumi · Posted: Thu May 24, 2018 4:26 am Post subject:

There is nothing about power saving, frequency changing in bios. :-/
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dumi · Posted: Sun May 27, 2018 6:23 am Post subject:

Yesterday i tried kernels 4.14.33 and 4.14.44 from gentoo-sources and git-sources-4.17.0-rc6. same problem.

Seems to kernel 4.9 is last in gentoo portage which works as expected, but without vega support is useless for me.
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virtguru · Posted: Wed May 30, 2018 11:48 am Post subject:

have you tried using maxcstate option on kernel command line ?
Vaguely remember earlier issues with ryzen and cstates.

dumi · Posted: Thu May 31, 2018 1:16 pm Post subject:

thank for suggestion.

i tried

theotherjoe · Guru Joined: 22 Nov 2003 Posts: 393

dumi,
I had some strange things going on with a new ryzen 5 1600 cpu which
could be narrowed down to the age of my PSU and the C6 power state.
during the process of chasing the error I came across the following
python script. maybe it can be of help for you too:

https://github.com/r4m0n/ZenStates-Linux

dumi · Posted: Thu May 31, 2018 7:59 pm Post subject:

theotherjoe

thanks for link. i tried to disable all states except P0, no change, after unpluging AC adaptor frequency drops to 399MHz, setting every P state that is enabled didnt help :-/

very strange think..
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dumi · Posted: Tue Jun 05, 2018 7:10 am Post subject:

i do some test:
last kernel that work fine is 4.14
4.15-rc1 behaves as descripted above, after disconnecting adapter CPU freq drops down and reboot is needed..
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dumi · Posted: Tue Jun 05, 2018 8:27 am Post subject:

amazing....

i reset bios settings do default and press button to disconnect notebook battery and after new boot frequency behaves correctly

maybe some bad was stuck somewhere in computer memory which persist power off and reboots, bios is set exactly the same as was...
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