Cause the 5.15.0-23-generic couldn't support it, I used 5.17 mainline kernel.
$ cat /proc/acpi/ibm/lcdshadow status: 0 commands: 0, 1 And after press the Fn + D, the screen display angle changed, and the content of /proc/acpi/ibm/lcdshadow is changed, and the GUI of 'Restrict Viewing Angle' is changed between on and off. Here is the bug for kernel. https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1966061 ** Tags added: oem-priority originate-from-1956808 sutton -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-control-center in Ubuntu. https://bugs.launchpad.net/bugs/1966178 Title: Screen-privacy couldn't work To manage notifications about this bug go to: https://bugs.launchpad.net/oem-priority/+bug/1966178/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
