pstate changes persist after reboot

GoogleCodeExporter commented 9 years ago

What steps will reproduce the problem?
1. lowered freq of boost pstate with -set command
2. run stress test + cpuusage, cpu usage definitely lower 
3. rebooted
4. checked -l and shows same lower freq, run stress test and still lower cpu 
usage

What is the expected output? What do you see instead?

I've not set anything up to run tpc at boot, when i used tpc a couple of years 
ago it reset during boot, which seems prudent as if i make a mistake that 
causes crashing I don't want it to happen again during boot.

I dunno if maybe a crash causes the settings to reset, but didn't see that in 
the documentation and don't want to do anything riskier without knowing for 
sure I can fix it without having to reinstall mint.

What version of the product are you using? On what operating system?

linux mint 13 maya, tpc 0.44 rc2

samsung np355v5c AMD a8-4500 laptop

Thanks!

Original issue reported on code.google.com by josh.iri...@gmail.com on 8 Mar 2013 at 1:38

GoogleCodeExporter commented 9 years ago

powered off without shutting down and they did indeed reset, so i guess it's by 
design :)

Original comment by josh.iri...@gmail.com on 8 Mar 2013 at 2:21

GoogleCodeExporter commented 9 years ago

Aye, it depends on BIOS/EC particulars.

In some configurations OS reboot makes the firmware cold reset the CPU -- TPC 
adjustments get lost.
In others -- warm reset is issued and TPC adjustments persist.

No matter what, power-cycle is always a "reliable" way to invalidate TPC 
adjustments,
regardless of the platform.

Original comment by kszy...@gmail.com on 19 Mar 2013 at 5:38

GoogleCodeExporter commented 9 years ago

Hi Josh.

If it's ok with you, I'm going to close this issue.

Bottom line is: it is platform-dependent whether changes made by TPC persist 
across
reboots. Power-cycling the machine is guaranteed to invalidate all settings 
made by
TPC.

Kris

Original comment by kszy...@gmail.com on 24 Apr 2013 at 12:51

Changed state: Invalid

GoogleCodeExporter commented 9 years ago

yeah thanks for your help

Original comment by josh.iri...@gmail.com on 24 Apr 2013 at 9:17

turionpowercontrol / tpc

pstate changes persist after reboot #19