linux-kernel - Re: keyboard backlight max_brightness bug on Dell Latitude E6410

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Date:   Thu, 14 Sep 2017 16:33:57 +0200
From:   Gabriele Mazzotta <gabriele.mzt@...il.com>
To:     Pali Rohár <pali.rohar@...il.com>
Cc:     "Gabriel M. Elder" <gabriel@...gnowsys.com>,
        Darren Hart <dvhart@...radead.org>, andy@...radead.org,
        "platform-driver-x86@...r.kernel.org" 
        <platform-driver-x86@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: keyboard backlight max_brightness bug on Dell Latitude E6410

2017-09-14 15:54 GMT+02:00 Pali Rohár <pali.rohar@...il.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@...il.com>
>> Date: Thu, September 14, 2017 3:06 am
>> To: "Gabriel M. Elder" <gabriel@...gnowsys.com>
>> Cc: dvhart@...radead.org, andy@...radead.org,
>> platform-driver-x86@...r.kernel.org, linux-kernel@...r.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</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@...il.com