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

[Seth Forshee]

On Thu, May 25, 2017 at 11:29:42AM +0800, Kai-Heng Feng wrote:
> 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(-)

Upstream fix, good testing, backport looks good.

Acked-by: Seth Forshee <seth.forshee at canonical.com>

Also applied to artful/master-next.