Re: keyboard backlight max_brightness bug on Dell Latitude E6410

Gabriele Mazzotta
2017-09-14T14:34:01Z

2017-09-14 15:54 GMT+02:00 Pali Rohár <pali.rohar@gmail.com>:
> Adding Gabriele to thread, IIRC you have machine which uses
> "supported keyboard light brightness levels"
> Can you look at this bug, if your machine is affected by it too?

My keyboard has two brightness levels + off. The value of
max_brightness is 2, as expected.

Gabriele

Yes, my laptop uses "supported keyboard light brightness levels".
>
> Important parts in ouptput:
>
>> ... --info
>> Supported Keyboard light brightness levels : 10
>
>> ... --get-status
>> Current keyboard light level : 9
>
> Gabriel, can you play with this tool, which values can be set via
> --set-level= parameter? Is 10 accepted? --get-status can be used to
> check if value was accepted.
>
> On Thursday 14 September 2017 06:35:15 Gabriel M. Elder wrote:
>>
>> 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@gmail.com>
>> Date: Thu, September 14, 2017 3:06 am
>> To: "Gabriel M. Elder" <gabriel@tekgnowsys.com>
>> Cc: dvhart@infradead.org, andy@infradead.org,
>> platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org
>>
>> 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
>>
>> 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@gmail.com