After a routine fwupd firmware update my laptop's built-in screen became very dim, even at "100%" brightness. An external monitor on the same machine looks completely normal. Laptop: Dell Latitude 5430, Intel Iris Xe (Alder Lake, i915), internal eDP …
TL;DR The new BIOS's GOP leaves the eDP panel in DPCD/AUX backlight mode, where
"maximum" brightness is physically dim, while i915 drives brightness over the PWM pin
(as the panel's VBT requests). … [+6616 chars]
Originally published by
Askubuntu.com
