** Description changed: + [Impact] + There's no sysfs node for some Dell laptop keyboard backlight control. + Two issues here: 1. No sysfs "/sys/devices/platform/dell-laptop/leds/dell::kbd_backlight" - The patch fixes the issue: + The patch fixes the issue by adding necessary DMI string to dmi whitelist table: + commit 8d2c4538dbc7154c4aed1364db127a0e51dbd459 Author: Alex Hung <[email protected]> Date: Thu Feb 16 20:58:03 2017 +0800 - platform/x86: dell-laptop: Add Latitude 7480 and others to the DMI + platform/x86: dell-laptop: Add Latitude 7480 and others to the DMI whitelist 2. The sysfs exits, but backlight cannot be controlled by "brightness" attribute. - The patch fixes the issue: + The patch fixes the issue by updating timeout AC, if the model supports it: commit 9216e0dcb5533a999d544d0af8661118e0588e1d Author: Pali Rohár <[email protected]> Date: Sun Apr 23 21:40:47 2017 +0200 - platform/x86: dell-laptop: Add keyboard backlight timeout AC + platform/x86: dell-laptop: Add keyboard backlight timeout AC settings + + [Test Case] + On Dell Precision 3250 (Kabylake generation), the backlight cannot be controlled in sysfs, because it does not exist. + With these two patches, keyboard backlight can be controlled in "/sys/devices/platform/dell-laptop/leds/dell::kbd_backlight". + + [Regression Potential] + The regression potential is low. Only newer Dell laptops will be affected, and it only applies to limited models.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1693126 Title: Keyboard backlight control does not work on some dell laptops. To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1693126/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
