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    Hotkey/powerbiosserver causing frustrating CPU throttle.

    Discussion in 'Sager and Clevo' started by 3Dawg, Jan 26, 2014.

  1. 3Dawg

    3Dawg Newbie

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    Hello everyone.

    I have a W550SU (no dGPU) with an i7-4702mq and I'm running Windows 8.1.

    The CPU clocks are limited to 1.4Ghz on battery, regardless of what power profile/setting is used in Windows. Even setting the minimum CPU state on battery to 100%, the clock speed remains limited to 1400Mhz. I've figured out that it's related to the Clevo Hotkey/control centre software, which engages a service called "Powerbiosserver". If I have the power profile on the Hotkey set to anything but "Performance" then I get this throttle. This software does not simply override the windows settings, it seems to interfere and clash leading to weird results.

    I tried disabling the service and removing the software which fixes the issue after rebooting. Clock speeds return to being unlocked and dictated by the windows power manager and not the clevo software. However, after sleeping the computer and waking it, the clock speed is mysteriously locked to 1400Mhz again until a reboot (or AC adaptor is plugged in).

    I checked for the powerbiosserver service to see if it was somehow still causing this and it no longer exists (it's removed when uninstalling the Hotkey) so I'm now struggling to progress with fixing this issue.

    I think the issue is related to changes in the registry that Hotkey makes, which it does not revert when uninstalling. I think it's the registries in "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\54533251-82be-4824-96c1-47b60b740d00 "

    These are responsible for certain power management settings/schemes which are not normally available for the user to change.

    Is there a way to perhaps reset these to windows defaults?

    I just want to reverse all the changes that the hotkey made.

    Thanks.