On a Hasee X5-2021S5H laptop (shipping a Core i5-11300H), with the mainline kernel (tested at commit 2c71fdf02a95b3dd425b42f28fd47fb2b1d22702) there's a strange issue: when the system is booted the turbo is de-facto disabled (the maximum frequency is capped at the max non-turbo frequency 3.1 GHz), but /sys/devices/system/cpu/intel_pstate/no_turbo reads 0.

More interestingly, just writing 0 into /sys/devices/system/cpu/intel_pstate/no_turbo enables the turbo.

So I added a script to be executed on boot:

while ! echo 0 > /sys/devices/system/cpu/intel_pstate/no_turbo; do
    sleep 10
done

and it only succeeds at the 3rd iteration.  During the 1st and 2nd iteration the echo command fails with EPERM.