[SRU] [Y/Z] [PATCH 0/1] Fix keyboard led sysfs cannot control its brightness

[Kai-Heng Feng]

BugLink: https://bugs.launchpad.net/bugs/1693126

Impact:
On some new dell laptops, the keyboard led backlight sysfs cannot control its brightness:
 dell_laptop: Setting old previous keyboard state failed
 leds dell::kbd_backlight: Setting an LED's brightness failed (-6)

Fix:
Commit 9216e0dcb5533a999d544d0af8661118e0588e1d can fix the issue:
 This patch adds support for retrieving current timeout AC values and also
 updating them. Current timeout value in sysfs is displayed based on current
 AC status, like current display brightness value.

Test:
Keyboad backlight now can be correctly controlled by sysfs
"dell:kbd_backlight/brightness" on Dell Precision 3520.

Pali Rohár (1):
  platform/x86: dell-laptop: Add keyboard backlight timeout AC settings

 drivers/platform/x86/dell-laptop.c | 59 ++++++++++++++++++++++++++++++++++----
 1 file changed, 53 insertions(+), 6 deletions(-)

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2.13.0