RE: keyboard backlight max_brightness bug on Dell Latitude E6410

[Gabriel M. Elder]

-------- Original Message --------
Subject: Re: keyboard backlight max_brightness bug on Dell Latitude
E6410
From: Pali RohÃr <pali.rohar@xxxxxxxxx>
Date: Mon, October 02, 2017 8:15 am
To: gabriel@xxxxxxxxxxxxxx
Cc: andy.shevchenko@xxxxxxxxx, gabriel@xxxxxxxxxxxxxx,
gabriele.mzt@xxxxxxxxx, dvhart@xxxxxxxxxxxxx, andy@xxxxxxxxxxxxx,
platform-driver-x86@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx,
Mario.Limonciello@xxxxxxxx

On Monday 02 October 2017 13:06:46 Mario.Limonciello@xxxxxxxx wrote:
> > -----Original Message-----
> > From: Pali RohÃr [mailto:pali.rohar@xxxxxxxxx]
> > Sent: Monday, October 2, 2017 6:53 AM
> > To: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
> > Cc: Gabriel M. Elder <gabriel@xxxxxxxxxxxxxx>; Gabriele Mazzotta
> > <gabriele.mzt@xxxxxxxxx>; Limonciello, Mario <Mario_Limonciello@xxxxxxxx>;
> > Darren Hart <dvhart@xxxxxxxxxxxxx>; Andy Shevchenko <andy@xxxxxxxxxxxxx>;
> > platform-driver-x86@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> > Subject: Re: keyboard backlight max_brightness bug on Dell Latitude E6410
> > 
> > On Friday 29 September 2017 18:19:59 Andy Shevchenko wrote:
> > > >> FYI, latest update and info relating to
> > > >> https://bugzilla.kernel.org/show_bug.cgi?id=196913
> > >
> > > Quick solution is to apply DMI to that.
> > 
> > It is only the Dell Latitude E6410 affected?
> > 
> > Mario, do you have any information about that API from Dell?
> > 
> > --
> > Pali RohÃr
> > pali.rohar@xxxxxxxxx
> 
> Pali,
> 
> I believe this particular API shouldn't have changed over generations, so it's 
> likely something that needs to be quirked for that generation. 
> I haven't had a chance to check on this yet in detail though.
> For now could you guys quirk this one and if I find out there was something
> more systemic we can undo the quirk and do something more broad.
> 
> Thanks,

Ok! Gabriel, can you provide us your DMI information about your machine?

They are included in following files:
/sys/class/dmi/id/sys_vendor
/sys/class/dmi/id/product_name

Beware that they may contain whitespace characters and it is important.

-- 
Pali RohÃr
pali.rohar@xxxxxxxxx

-------------------------------------------------------------------------------
# cat -v /sys/class/dmi/id/sys_vendor
Dell Inc.
# cat -v /sys/class/dmi/id/product_name
Latitude E6410
# cat -v /sys/class/dmi/id/sys_vendor | hexdump
0000000 6544 6c6c 4920 636e 0a2e               
000000a
# cat -v /sys/class/dmi/id/product_name | hexdump
0000000 614c 6974 7574 6564 4520 3436 3031 000a
000000f

Also updated https://bugzilla.kernel.org/show_bug.cgi?id=196913 with
this info

- Gabriel
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