From: bugzilla-daemon@kernel.org
To: platform-driver-x86@vger.kernel.org
Subject: [Bug 218305] Ryzen 7 7840HS gets stuck at 544MHz frequency after a random number of suspend/resume cycles
Date: Fri, 19 Jan 2024 13:52:48 +0000 [thread overview]
Message-ID: <bug-218305-215701-gpLpnMkDPS@https.bugzilla.kernel.org/> (raw)
In-Reply-To: <bug-218305-215701@https.bugzilla.kernel.org/>
https://bugzilla.kernel.org/show_bug.cgi?id=218305
--- Comment #18 from Dan Martins (dan.martins@zoho.com) ---
(In reply to Mario Limonciello (AMD) from comment #14)
> I read through this thread and I currently think that Artem and Dan have
> encountered two separate bugs.
>
> @Artem:
>
> Under the presumption that ryzenadj is actually retrieving the correct
> values for STAPM, PPT FAST, and PPT SLOW I want to ask if this is tied to a
> specific power adapter, or sequence of events. Like suspend on power,
> resume on battery or suspend on battery resume on power.
>
> If there is a linkage between any of those, then I think this is "most
> likely" an HP EC bug.
>
> @Dan,
>
> Can you reproduce this if you manually always set the scaling governor on
> all CPUs to "performance" before you reboot?
Mario,
I just tested setting the governor to performance before reboot and yes, it is
reproducible in that case too.
1. load the CPU and observe all cores can reach ~4Ghz
2. set governor: sudo cpupower frequency-set -g performance
3. reboot
4. load the CPU and check frequencies: on first reboot, all cores hit 4GHz
range. On second reboot, cores 6-11 can only reach ~1.7GHz.
This is in-line with previous tests. It is inconsistent, and various power
settings don't seem to affect it (epp, platform_profile, scaling_governor). It
does seem much more likely to occur when on battery, but will stills happen
sometimes when plugged in.
A couple of more recent observations:
- I don't need to toggle from performance to powersave to fix it. I can just
"sudo cpupower frequency-set -g powersave" even when it is already reporting
that it is using the powersave governor.
- on reboot, the scaling_governor is always showing powersave, even when I set
it to performance before reboot.
- Using kernel 6.6.11 as of this morning for the above test
Thanks,
Dan
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next prev parent reply other threads:[~2024-01-19 13:52 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-24 7:21 [Bug 218305] New: Ryzen 7 7840HS gets stuck at 544MHz frequency after a random number of suspend/resume cycles bugzilla-daemon
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2024-03-06 17:17 ` [Bug 218305] Ryzen 7 7840HS gets stuck at 544MHz frequency after resuming after unplugging the power cord during sleep bugzilla-daemon
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