Re: Input: mouse: Trackpoint middle button not recognized on Thinkpad E470

[Peter Hutterer <peter.hutterer@who-t.net>]

On Tue, Jun 06, 2017 at 08:09:50PM +0200, Julian Exner wrote:
> Hi all,
> 
> sorry for neglecting this thread for so long. And thanks Ulrik for pointing
> me to the formalities.
> 
> > I was kind of surprised at first that the value was 0x33 instead of 0x3
> > until I read the documentation pointers Julian provided.
> 
> It seems like some kind of softswitch or masking for the individual buttons.
> One of the 4-bit nibbles indicates the number of available buttons in
> hardware, the other one the number of activated buttons.
> 
> > I really would like this patch to become part of the linux kernel and
> > I hope that Julian will go through the formalities for patch submission.
> 
> I'm willing to do so, but I'm very short on time currently. Additionally, I
> checked on a Thinkpad forum and was told that there are Thinkpads from the
> 90s with two buttons (e.g. ThinkPad 760 and those before ThinkPad
> 390/600/770). So I'm a bit afraid that simply setting the default to three
> buttons may break something for these models and a more elaborate patch may
> be necessary.

how many of these do you expect to still be alive *and* in need of a new
kernel? wikipedia says the 760 was produced 1995 to 1998 which would make
the newest of them 19 years old now. I'd rather have a hwdb quirk for those
in userspace, because disabling event codes is trivial.

Cheers,
   Peter