FS#56866 - [linux] CPU frequncy freezing
Attached to Project:
Arch Linux
Opened by Daniel Bershatsky (daskol) - Tuesday, 26 December 2017, 08:50 GMT
Last edited by Doug Newgard (Scimmia) - Monday, 29 January 2018, 15:21 GMT
Opened by Daniel Bershatsky (daskol) - Tuesday, 26 December 2017, 08:50 GMT
Last edited by Doug Newgard (Scimmia) - Monday, 29 January 2018, 15:21 GMT
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Details
On my Dell Latitude E7470 laptop CPU frequency scaling
exhibits weird behavior. If AC adapter is plugged in then
everything is okay. But if one switch to battery the CPU
frequency squeeze on 400MHz and this value could not change
neither with cpupower nor sysfs. I have check this issue
with intel_pstate module as well as acpi-cpufreq. In the
case of acpi-cpufreq CPU frequncy scaling is completly
broken since cpupower shows actual frequency 2.8GHz while
i7z says that frequency is about 400MHz.
Well, Intel Core i7 works as Pentium III. Additional info: * kernl 4.14.8-1-ARCH * intel-ucode 20171117-1 * linux-firmware 20171206.fdee922-1 Steps to reproduce: * plugin in AC adapter * look at frequency in output of i7z * remove AC adapter * look at frequency in output of i7z |
This task depends upon
1. shutdown your laptop
2. remove back cover
3. unplug battery
4. hold power button for 20s (I counted to 40 to be sure)
5. replug battery
6. attach back cover
7. start laptop and retest