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"Freezing"/Not-Loading of GUI with Linux (Ubuntu derivatives) when NOT connected to power.

Star I
System: POP!_OS 20.04
Battery or AC: Battery
Model: ZenBook FLip 14 UX462DA
Frequency of occurrence: every boot
Detailed description:
Hello fellows.
I bought the ZenBook about six months ago. I first tried Feren OS.
On every startup without being connected to power it loaded the GUI and then freezed. I could move Mouse, but couldn't hit any button.
Then I tried Ubuntu itself. Same issue but instead of loading all GUI parts it only showed me the background.
Now i use POP!_OS (also Ubuntu derivative) same issue but it only shows grey on screen, sometimes interrupted by black for a second.

This happens only when booting WITHOUT power connection. If I boot connected to power it all works fine. Also if I remove power connection after booting it all works fine. It's just on booting.

Can anyone relate to the problem or has a fix?


Star I
I fixed it by adding "iommu=soft" to the kernel boot options.