OEM BIOS engineer has given the following feedback on Mar. 18: " // It should not be removed, since it is the key process to convert OS brightness percentage (0-100) to the actual LCD PWM brightness duty value (0-255) along with the brightness curves which are defined for each LCD panels. If you remove it, the brightness function will break on Windows 7. The available brightness percentage values are defined in ACPI _BCL. Linux driver should only use the values defined in _BCL. Please see "Appendix: Video Extensions" chapter in ACPI spec. B.5.3 _BCM (Set the Brightness Level) This method allows OSPM to set the brightness level of a built-in display output device. The OS will only set levels that were reported via the _BCL method. This method is required if _BCL is implemented. Best Regards, Norihito Ishida // "
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1270079 Title: [Lenovo T540p, W540] Backlight interfaces not fully working To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-lts-raring/+bug/1270079/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
