The proposed fix also works for X11: I was affected by this and adding i915.enable_dpcd_backlight=0 to GRUB_CMDLINE_LINUX_DEFAULT also fixes it for me.
Operating System: Kubuntu 24.04 KDE Plasma Version: 5.27.12 KDE Frameworks Version: 5.115.0 Qt Version: 5.15.13 Kernel Version: 7.0.0-28-generic (64-bit) Graphics Platform: X11 Graphics Processor: Mesa Intel® UHD Graphics 620 System Version: ThinkPad T480 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2161826 Title: i915 DPCD backlight bug on Broadwell (ThinkPad T450s): black screen after suspend + broken brightness, fixed by i915.enable_dpcd_backlight=0 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2161826/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
