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dumi n00b
Joined: 17 Mar 2004 Posts: 19 Location: Czech Republic
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Posted: Mon May 21, 2018 8:03 pm Post subject: Ryzen 5 strange frequency states |
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Hi, a bought new acer Nitro 5 notebook with Ryzen CPU (see below).
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AMD Ryzen 5 2500U with Radeon Vega Mobile Gfx
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I'm using gentoo linux for more than ten years, bud now i'm in corner.
I try to use kernel gentoo-sources-4.9.x, it works fine (but it has no support for VEGA graphics), CPU reports frequency 2.0Ghz (right), when i disconnect AC adaptor frequency falls down ti 1.6Ghz, it;s ok, when i plugin AC adaptor back frequency returns to 2.0Ghz and remain stable.
Because of missing vega support i try to build kernel gentoo-sources-4.16.9, vega works fine, but cpu frequency behaves strange.
It is not stable on 2.0GHz bud every core has different frequency at freq fluctuate between about 1300 - 3800 MHz. When i disconnect AC adapter freq falls down to 399MHz on all cores and remain here stable until reboot. After connection AC adapter back nothning changes. Frequency realy falls down, i try some test with compiling software and procesing power is enormly low.
I try lot of settings in kernel, but without success.
Any ideas what to do?
Thank. _________________ Software is like sex.
It's better when it's free. |
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Ant P. Watchman
Joined: 18 Apr 2009 Posts: 6920
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Posted: Tue May 22, 2018 3:15 am Post subject: |
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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. |
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dumi n00b
Joined: 17 Mar 2004 Posts: 19 Location: Czech Republic
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Posted: Tue May 22, 2018 4:15 am Post subject: |
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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. _________________ Software is like sex.
It's better when it's free. |
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dumi n00b
Joined: 17 Mar 2004 Posts: 19 Location: Czech Republic
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Posted: Tue May 22, 2018 6:38 pm Post subject: |
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cpupower output before disconnection AC adapter
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dumidek ~ # cpupower frequency-info
analyzing CPU 0:
driver: acpi-cpufreq
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
hardware limits: 1.60 GHz - 2.00 GHz
available frequency steps: 2.00 GHz, 1.70 GHz, 1.60 GHz
available cpufreq governors: performance
current policy: frequency should be within 1.60 GHz and 2.00 GHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency is 2.00 GHz (asserted by call to hardware).
boost state support:
Supported: no
Active: no
Boost States: 0
Total States: 3
Pstate-P0: 2600MHz
Pstate-P1: 2700MHz
Pstate-P2: 2400MHz
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Cpu frequency reported by /proc/cpuinfo
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dumidek ~ # cat /proc/cpuinfo |grep MHz
cpu MHz : 3089.260
cpu MHz : 3090.212
cpu MHz : 3133.338
cpu MHz : 3133.347
cpu MHz : 3142.518
cpu MHz : 3142.525
cpu MHz : 3102.502
cpu MHz : 3102.623
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After disconection and reconection AC adapter:
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dumidek ~ # cpupower frequency-info
analyzing CPU 0:
driver: acpi-cpufreq
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
hardware limits: 1.60 GHz - 2.00 GHz
available frequency steps: 2.00 GHz, 1.70 GHz, 1.60 GHz
available cpufreq governors: performance
current policy: frequency should be within 1.60 GHz and 2.00 GHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency is 2.00 GHz (asserted by call to hardware).
boost state support:
Supported: no
Active: no
Boost States: 0
Total States: 3
Pstate-P0: 2600MHz
Pstate-P1: 2700MHz
Pstate-P2: 2400MHz
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dumidek ~ # cat /proc/cpuinfo |grep MHz
cpu MHz : 399.263
cpu MHz : 399.265
cpu MHz : 399.263
cpu MHz : 399.264
cpu MHz : 399.265
cpu MHz : 399.263
cpu MHz : 399.263
cpu MHz : 399.262
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Computer realy slow down, so freq is realy changed...
I don't know what to do with this, only restart help.[/code] _________________ Software is like sex.
It's better when it's free. |
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dumi n00b
Joined: 17 Mar 2004 Posts: 19 Location: Czech Republic
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Posted: Tue May 22, 2018 6:58 pm Post subject: |
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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 _________________ Software is like sex.
It's better when it's free. |
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Goshanecr Apprentice
Joined: 17 Aug 2005 Posts: 158 Location: Russia
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Posted: Tue May 22, 2018 7:52 pm Post subject: |
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Maybe there is a BIOS update for Your laptop? |
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dumi n00b
Joined: 17 Mar 2004 Posts: 19 Location: Czech Republic
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Posted: Wed May 23, 2018 7:00 am Post subject: |
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I didnt found anything about bios update on this model :-/
Today i will test this on debian live CD. _________________ Software is like sex.
It's better when it's free. |
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Anon-E-moose Watchman
Joined: 23 May 2008 Posts: 6098 Location: Dallas area
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Posted: Wed May 23, 2018 9:56 am Post subject: |
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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. _________________ PRIME x570-pro, 3700x, 6.1 zen kernel
gcc 13, profile 17.0 (custom bare multilib), openrc, wayland |
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dumi n00b
Joined: 17 Mar 2004 Posts: 19 Location: Czech Republic
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Posted: Wed May 23, 2018 11:20 am Post subject: |
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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. _________________ Software is like sex.
It's better when it's free. |
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Anon-E-moose Watchman
Joined: 23 May 2008 Posts: 6098 Location: Dallas area
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Posted: Wed May 23, 2018 11:51 am Post subject: |
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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. _________________ PRIME x570-pro, 3700x, 6.1 zen kernel
gcc 13, profile 17.0 (custom bare multilib), openrc, wayland |
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dumi n00b
Joined: 17 Mar 2004 Posts: 19 Location: Czech Republic
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Posted: Wed May 23, 2018 12:11 pm Post subject: |
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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 _________________ Software is like sex.
It's better when it's free. |
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dumi n00b
Joined: 17 Mar 2004 Posts: 19 Location: Czech Republic
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Posted: Wed May 23, 2018 12:54 pm Post subject: |
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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... _________________ Software is like sex.
It's better when it's free. |
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krinn Watchman
Joined: 02 May 2003 Posts: 7470
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Posted: Wed May 23, 2018 4:21 pm Post subject: |
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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 |
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Anon-E-moose Watchman
Joined: 23 May 2008 Posts: 6098 Location: Dallas area
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Posted: Wed May 23, 2018 4:23 pm Post subject: |
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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. _________________ PRIME x570-pro, 3700x, 6.1 zen kernel
gcc 13, profile 17.0 (custom bare multilib), openrc, wayland |
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dumi n00b
Joined: 17 Mar 2004 Posts: 19 Location: Czech Republic
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Posted: Thu May 24, 2018 4:26 am Post subject: |
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There is nothing about power saving, frequency changing in bios. :-/ _________________ Software is like sex.
It's better when it's free. |
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dumi n00b
Joined: 17 Mar 2004 Posts: 19 Location: Czech Republic
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Posted: Sun May 27, 2018 6:23 am Post subject: |
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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. _________________ Software is like sex.
It's better when it's free. |
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virtguru Tux's lil' helper
Joined: 14 Aug 2010 Posts: 148 Location: The Greatest Country in the World
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Posted: Wed May 30, 2018 11:48 am Post subject: |
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have you tried using maxcstate option on kernel command line ?
Vaguely remember earlier issues with ryzen and cstates. |
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dumi n00b
Joined: 17 Mar 2004 Posts: 19 Location: Czech Republic
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Posted: Thu May 31, 2018 1:16 pm Post subject: |
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thank for suggestion.
i tried
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processor.max_cstate=1 intel_idle.max_cstate=0
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and
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processor.max_cstate=0
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Nothing helps. but on first try, CPU fan was going on 100% (temperature was normal).
_________________ Software is like sex.
It's better when it's free. |
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theotherjoe Guru
Joined: 22 Nov 2003 Posts: 393
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Posted: Thu May 31, 2018 3:23 pm Post subject: |
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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 |
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dumi n00b
Joined: 17 Mar 2004 Posts: 19 Location: Czech Republic
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Posted: Thu May 31, 2018 7:59 pm Post subject: |
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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.. _________________ Software is like sex.
It's better when it's free. |
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dumi n00b
Joined: 17 Mar 2004 Posts: 19 Location: Czech Republic
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Posted: Tue Jun 05, 2018 7:10 am Post subject: |
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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.. _________________ Software is like sex.
It's better when it's free. |
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dumi n00b
Joined: 17 Mar 2004 Posts: 19 Location: Czech Republic
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Posted: Tue Jun 05, 2018 8:27 am Post subject: |
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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... _________________ Software is like sex.
It's better when it's free. |
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