output from smbios-keyboard-ctl --info: Libsmbios version : 2.3.0 smbios-keyboard-ctl version : 2.3.0 Capabilities of KeyBoard Illumination on your system: ------------------------------------------------------------------- Supported USER Selectable Modes : Always OFF Auto: ALS- and input-activity-based On; input-activity based Off Auto: Input-activity-based On; input-activity based Off Supported Keyboard illumination type : Backlight Supports Keyboard illumination on : Any Keystroke Touchpad activity Pointing stick Can configure Keyboard illumination timeout unit in : Seconds Minutes Hours Supported Keyboard light brightness levels : 10 Maximum acceptable seconds timeout value : 255 Maximum acceptable minutes timeout value : 255 Maximum acceptable hours timeout value : 12 Maximum acceptable days timeout value : 0 output from smbios-keyboard-ctl --get-status: Helper function to print current status of keyboard illumination Current status of KeyBoard Illumination setting on your system: ------------------------------------------------------------------- Configured mode state: Auto: Input-activity-based On; input-activity based Off Your Keyboard will illumination on: Any Keystroke Touchpad activity Pointing stick Keyboard illumination timeout has bee set at: 10 Seconds Current setting of ALS value that turns the light on or off: 18 Current ALS Reading : 16 Current keyboard light level : 9 -------- Original Message -------- Subject: Re: keyboard backlight max_brightness bug on Dell Latitude E6410 From: Pali Rohár <pali.rohar@xxxxxxxxx> Date: Thu, September 14, 2017 3:06 am To: "Gabriel M. Elder" <gabriel@xxxxxxxxxxxxxx> Cc: dvhart@xxxxxxxxxxxxx, andy@xxxxxxxxxxxxx, platform-driver-x86@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx On Monday 11 September 2017 23:25:27 Gabriel M. Elder wrote: > Hi all, > Hans de Goede, one of the upower maintainers, suggested I alert you all to this bug: > > https://bugs.freedesktop.org/show_bug.cgi?id=100041 > > and the new one I filed via the kernel bugzilla: > > https://bugzilla.kernel.org/show_bug.cgi?id=196913 > "keyboard backlight max_brightness value outside allowable range on Dell Latitude E6410 laptop" > > Please check it out at your earliest convenience. > > thanks, > - Gabriel</html> Hi Gabriel, please avoid sending such html emails to mailing list as it is hard to read them and also you have a very big chance that email would be eaten by spam filter or other developers would completely ignore it... To debug your problem, can you run smbios-keyboard-ctl tool from the libsmbios project? https://github.com/dell/libsmbios We would need output from --info parameter and also from --get-status. -- Pali Rohár pali.rohar@xxxxxxxxx