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SubjectRE: keyboard backlight max brightness bug on Dell Lat itude E6410

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 :

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
From: Pali Rohár <>
Date: Thu, September 14, 2017 3:06 am
To: "Gabriel M. Elder" <>

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:
> and the new one I filed via the kernel bugzilla:
> "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?

We would need output from --info parameter and also from --get-status.

Pali Rohár

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