Rog ally undervolting with lact not possible

Hi, i was trying to undervolt gpu of my rog ally. Bad good experiences on my deck (BIOS) und desktop (corectrl). However on my ally the option in lact to undervolt is not available. Checked amdgpu.ppfeaturemask and even set it to 0xfffffff (via rpm-ostree kargs and validted). Do I miss anything essential?
Solution
You can't undervolt z1e
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