To provide further verification, I built Ubuntu-5.4-5.4.0-14.17 with a
single patch on top that reverts commit 3269788061d2 ("USUNTU: SAUCE:
drm/i915: Force DPCD backlight mode on Dell Precision 4K sku"). My
screen brightness controls are working again and I can undock from my
external monitor without having to forcibly reboot the system due to a
blank screen on my built-in monitor (I guess my screen brightness is
turned all the way down when I undock and I cannot adjust it).-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1861521 Title: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-5.4/+bug/1861521/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
