For me the firmware 0x01030b00 solved most of the problem. It now runs well on my previous laptop 65W HP charger, which is much lighter than the literal brick the G1a came with. It still does not work on an Anker 140W power bank I have.
However this firmware was only available on HP's website for a few days. It has now been retracted, but it works well for me so YMMV.
My last remaining hurdle is getting color correction working for the DCI-P3 OLED screen. Maybe it's a Gnome/Wayland thing but I cannot get full display correction to work so colors are ultra saturated.
Edit: the fan curve is also bad, it makes fans spin up/down continuously under certain conditions. Not a deal breaker but quite annoying when it happens.
The fan curve also drives me nuts. It seems to be related to the processor's speed so I turn off boost — I don't notice a perf diff for my workloads. The fan noise is much better.
However this firmware was only available on HP's website for a few days. It has now been retracted, but it works well for me so YMMV.
My last remaining hurdle is getting color correction working for the DCI-P3 OLED screen. Maybe it's a Gnome/Wayland thing but I cannot get full display correction to work so colors are ultra saturated.
Edit: the fan curve is also bad, it makes fans spin up/down continuously under certain conditions. Not a deal breaker but quite annoying when it happens.