Above workaround from buxterioza worked on a Dell Latitude 7490 (which likely shares much of the same hardware).
Machine: Dell Latitude 7490 GPU: Intel UHD Graphics 620 (Kaby Lake-R GT2) OS: Kubuntu 26.04 Kernel: 7.0.0-28-generic Confirming here that the i915.enable_dpcd_backlight=0 worked for me as well. Full brightness achieved, control over brightness retained, even with 7.0.0-28 kernel. Thanks for the workaround research. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2161148 Title: [SRU] intel_backlight (i915/eDP AUX-DPCD) stops responding to live brightness writes in 7.0.0-28-generic (works in 6.17.0-40-generic) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2161148/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
