Upstream, the kernel team is saying that it is a platform driver issue or bios... sony is not supporting linux, so I think the only way to have it fix before 2050 is to bring the nvidia driver to manage backlight (also in /sys and /proc) so adding nvidia pkg to the report...
** Also affects: nvidia-graphics-drivers-180 (Ubuntu) Importance: Undecided Status: New -- backlight not appearing in sysfs nor laptop_panel in lshal for sony vaio fz https://bugs.launchpad.net/bugs/377353 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs