Okay, but I changed the heading of this bug report: Identical behaviour
with "Intel Iris Xe GPU". Just to mention this. See also:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2063983/comments/13
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Deleting "quiet splash" is the better workaround, rather than
"nomodeset". I can confirm that without either "quiet splash" AND
"nomodeset" in GRUB all energy saving works in the HP notebook with AMD
Radeon Integrated Graphics (see above).
The following is copied from
https://bugs.launchpad.net/ub
