I have the Zbook Ultra G1a since it came out. The USB-C PD implementation is very bad, badly broken. I have not been able to get it to charge or even use anything but the HP 140W charger while on. While off, anything works, but once powered on into Ubuntu (from HP!) of Windows... It does not charge or use the power at all. Even with 140W 3rd party chargers from Anker, Ugreen, Insignia, etc.

Super limits its usability.

I had the same issue, where it would only charge with my 100W or above chargers. It worked with Dell USB-C 130W chargers (both genuine and knock off) and the HP charger, as well as a Baseus 100W charger. I have noticed yesterday it was working with my other chargers as well, something it certainly didn't do before. Maybe fixed through firmware update?

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 It has now been retracted, but it works well for me so YMMV.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.

I have one as well and haven't had this problem. I've been using mostly the HP G4 dock and a Dell dock at the office with an occasional use of the charger. I'm running Linux 6.17.8-arch1-1, it could also be fixed in newer kernels. When I play demanding games, it pulls quite a few watts and all the chargers are keeping up.

It might be your device that is unlucky, maybe contacting support might help.

The AMD Framework laptops have the same issues, I've heard from several people. It seems AMD's implementation of USB C/4/PD is just broken (or at least extremely difficult to write firmware for)