linux-kernel - Re: [SUSPECT SPAM] Re: [PATCH] Add a quirk for the Dell XPS 13 (2015) when in PS/2 mode.

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Message-ID: <54EE1199.3090501@dell.com>
Date:	Wed, 25 Feb 2015 12:16:57 -0600
From:	Mario Limonciello <mario_limonciello@...l.com>
To:	Pali Rohár <pali.rohar@...il.com>
CC:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	Rob <robr.bensson@...il.com>
Subject: Re: [SUSPECT SPAM] Re: [PATCH] Add a quirk for the Dell XPS 13 (2015)
 when in PS/2 mode.


On 02/23/2015 06:01 PM, Pali Rohár wrote:
> On Tuesday 24 February 2015 00:31:52 Mario Limonciello wrote:
> For older dell models (some old inspirions and maybe also
> latitude) it was possible to use undocumented DELLDIAG interface
> (which enter into SMM mode and call some functions) to enable
> that "RAW" mode.
>
> Now when you are discussing with us, do you have some information
> or can you comment (if it is not secret) that DELLDIAG SMM
> interface?
>
> In linux kernel we have for it driver (provides info about
> temperature, fan speed, power management, hotkeys, ...), but it
> use undocumented interface (and sometimes it has problems):
>
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/char/i8k.c
I don't have any more information I can share on this interface other than I wouldn't recommend to rely on it.  It's generally not supposed to be used by the OS but only for diagnostic purposes from BIOS level diagnostic tools.
> Nothing new. It is that problem with repeating keys which is
> fixed by last version of BIOS.
>
> I saw one E6440 model with preinstalled Ubuntu 12.04.2 and
> distributed with A08 BIOS (which had that problem). And this was
> very very annoying! You could imagine it, you buy new Latitude
> (business class pro notebook), you started it and on preinstalled
> OS, keyboard is not usable. Updating to A10 fixed it.
>

I'm sorry that this had actually made it out the door with a pre-installed machine, but I'm glad we were able to get it fixed in the field.

> In this forum thread people reported that "repeating keys"
> problem for more models: http://en.community.dell.com/support-forums/laptop/f/3518/t/19593360?pi239031352=19
Yes, there is a support agent in that thread relaying those models to the BIOS team.
> And it looks like (from what I'm reading) last version A10 of
> E6440 BIOS broke USB3.0 support.
>


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