Thread (34 messages) 34 messages, 6 authors, 2016-11-14

Re: v4.8-rc1: thinkpad x60: running at low frequency even during kernel build

From: Pavel Machek <hidden>
Date: 2016-11-05 14:04:41
Also in: linux-acpi, lkml, platform-driver-x86

On Sat 2016-11-05 14:53:13, Pavel Machek wrote:
Hi!
quoted
quoted
Ok, can do, let me recompile and reboot.
quoted
When temperature limit is reached acpi_processor_ppc_notifier()
should
be called.
No, that's not correct for ACPI passive trip points, is it? If I
recall correctly, those should be monitored even when temperature is
below them so that it does not reach them...?
No if BIOS is sending PPC, it will be called. You can try first in 4.8.

Also try

Don't run workload, just on an idle system.

# echo 1 > /sys/class/thermal/cooling_device2/cur_state
monitor the scaling_max_freq, it should reduce

# echo 2 > /sys/class/thermal/cooling_device2/cur_state
monitor the scaling_max_freq, it should reduce
Yes, this seems to work. scaling_max goes to 1.5, then 1.1. Also under
load, scaling_max_freq changes. But at that point, we are already
around 98C... and bios_limit stays the same all the time in v4.9.
...while in v4.8-rc1, bios limit goes to 1.0 GHz at 90C, and
temperature just doesn't go above that.

Does it make sense to try with v4.8-final?

Best regards,
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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