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[mdklassen]

> I myself had the same issues on a stock Spectre x360 ac000ng. Also, only happening on battery power.

On battery power, the motherboard may slow-down the CPU, to use less power per minute, to extend the battery's charge.

Of course, a slower CPU will make the computer more "sluggish", such as slow to react to physical movements of the mouse, or slow to "echo" (font size, font colour, font kerning, spell-check) to characters that you type.

In Windows 10, check Task Manager, while running on battery, to see the "current" CPU clocking, versus the "rated" clocking.

[wahlsn]

In my case I already had the BIOS set to max performance instead of power saving. Also the power scheme was set identical between battery and power plug.

The task manager only showed 1-2% usage, which is basically background noise.

If the CPU goes to a p-state running on lower frequency, it should go to lower states for more power when needed. Though, I do not expect that moving the mouse cursor only is creating that much CPU load - as the task manager also tells. It is also possible on the power scheme to limit the minimum frequency the CPU can decrease for power saving.

If you think of c-states, which do not make sense, as the CPU was not idle, but the latency here is less than 0.5 seconds for reaching C0 as full power state. The freezing in my case was between 2 and 30 seconds.

Might be that the CPU is going back to a C-state immediatly before the programm code was completly executed. But this would be an error in the implementation for me. In Linux I am using c-states up to C9 without any freeze but I am not using some of the other options, especially the gpu power saving is not that much used.

At the end, there was no setting/option for power saving in Windows or Bios that could be changed to get rid of the freezes. The Bios itself is completly stripped down with no option but the choise between max. performance and some power saving. What ever this really does. But this is a consumer device so nothing to change here. My business notebook (different brand) has a whole bunch of options here.

Still, as I already mentioned, I still believe there are some issues with power saving techniques but nothing that could be changed by the user. BIOS (ACPI implementation), CPU, GPU are my favorites. Might also be the harddrive though, which might explain a few seconds of freeze until the drive is ready. If you look for similar devices like the Dell XPS 13 you can find complaints about freezes, too. This all reads the very same.