linux-kernel - Re: [PATCH] Input: atkbd: Fix release quirk for Dell models

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Message-Id: <201504082254.20875@pali>
Date:	Wed, 8 Apr 2015 22:54:20 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Input: atkbd: Fix release quirk for Dell models

On Monday 06 April 2015 18:20:56 Dmitry Torokhov wrote:
> On Mon, Apr 06, 2015 at 10:06:10AM +0200, Pali Rohár wrote:
> > On Monday 06 April 2015 01:53:43 Dmitry Torokhov wrote:
> > > On Mon, Apr 06, 2015 at 12:00:32AM +0200, Pali Rohár wrote:
> > > > On Sunday 05 April 2015 23:48:33 Dmitry Torokhov wrote:
> > > > > Hi Pali,
> > > > > 
> > > > > On Sun, Mar 29, 2015 at 04:36:19PM +0200, Pali Rohár
> > > > > wrote:
> > > > > > This patch fixes commit 61579ba83934 ("Input: atkbd
> > > > > > - expand Latitude's force release quirk to other
> > > > > > Dells"). Before that commit release quirks were
> > > > > > called for all Dell Latitude models. After that
> > > > > > commit only for Portable Dell devices. But lot of
> > > > > > Latitude models are Laptop or Notebook DMI devices
> > > > > > so quirks are not called.
> > > > > > 
> > > > > > Release quirks are still needed also for new Dell
> > > > > > Latitude models, so this patch enables quirks for
> > > > > > all Portable, Laptop, Notebook and Sub-Notebook
> > > > > > Dell devices.
> > > > > 
> > > > > Does Dell use all these types for their laptops? What
> > > > > models do you know that need this quirk?
> > > > > 
> > > > > Thanks.
> > > > 
> > > > I do not if Dell use all types, but months ago Matthew
> > > > wrote to include also other numbers not only 9 (Laptop)
> > > > and you agreed.
> > > 
> > > Hmm, I tried looking back but I could not quite find the
> > > discussion.
> > 
> > Search for Message-ID: <20141222175632.GB18556@...r-ws>
> > (this should be unique identifier for emails)
> 
> Ah, indeed. Sorry, at this time I completely forgot that we
> are controlling this from userspace nowadays.
> 
> > > > I do not know exact list of models which needs these
> > > > quirks, but before that commit (61579ba83934) it was
> > > > used for all Latitude models. At least I see that
> > > > switches do not generate release events and on older
> > > > Latitude machines some Fn keys do not generate them
> > > > too.
> > > 
> > > So the question is still: what models do need this quirk
> > > and what chassis type they are used.
> > 
> > My model:
> > 
> > $ cat /sys/class/dmi/id/chassis_type
> > 9
> > $ cat /sys/class/dmi/id/sys_vendor
> > Dell Inc.
> > $ cat /sys/class/dmi/id/product_name
> > Latitude E6440
> > 
> > > Regardless, I have not accepted quirks for force_release
> > > and atkbd keymaps for many years now as the task to
> > > adjust both keymap and force_release list has been
> > > offloaded to udev.
> > > 
> > > Thanks.
> > 
> > Ok, and what to do with kernel regressions? As before commit
> > 61579ba83934 it worked, because quirk was called for all
> > Latitude (independently on chassis_type).
> 
> No, this is not a kernel regression because it would mean that
> your laptop worked properly with then current kernel and then
> stopped working. Given that the change went in in 2008 and
> your laptop is a bit newer than that you can't claim kernel
> regression here; as far as I can see the change was
> reasonable for the lineage we had back then, or at least
> noone notified us for about 6 years.
> 
> So please do adjust udev rules, there are quite a bit for
> tweaks for Dell and other manufacturer's laptop keyboards
> there).
> 
> Thanks.

Ok, thanks for information. Maybe you can add some comment to 
source code or documentation, that this part of code is now 
handled by userspace. So other people send patches to correct 
place/projects in future.

-- 
Pali Rohár
pali.rohar@...il.com

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