Tthere are 8 acpi_video directories in /sys/class/backlight/ , but none of them can adjust the brightness. >From my point of view, the brightness is only controlled by an AV board, so we can't adjust the brightness through ACPI or WMI.
BTW, it doesn't use any dell_wmi driver, and I can't insert dell_wmi nor dell_wmi_aio driver, the WMI GUID it has is not listed in the driver, that means it has a non standard WMI GUID. So, I think we can do nothing for this machine. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1203982 Title: [Dell Inspiron One 2020] Unable to adjust screen brightness To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1203982/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
