linux-kernel - Re: 答复: 答复: 答复: [PATCH] input: alps-fix the issue the special alps trackpoint do not work.

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Date:   Fri, 24 May 2019 11:52:11 +0200
From:   Pali Rohár <pali.rohar@...il.com>
To:     Peter Hutterer <peter.hutterer@...-t.net>
Cc:     Hui Wang <hui.wang@...onical.com>,
        Xiaoxiao Liu <xiaoxiao.liu-1@...alps.com>,
        dmitry.torokhov@...il.com, XiaoXiao Liu <sliuuxiaonxiao@...il.com>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Xiaojian Cao <xiaojian.cao@...alps.com>,
        "zhangfp1@...ovo.com" <zhangfp1@...ovo.com>
Subject: Re: 答复: 答复: 答复: [PATCH] input: alps-fix the issue the
 special alps trackpoint do not work.

On Friday 24 May 2019 19:32:38 Peter Hutterer wrote:
> On Fri, May 24, 2019 at 09:26:48AM +0200, Pali Rohár wrote:
> > On Friday 24 May 2019 13:50:53 Hui Wang wrote:
> > > On 2019/5/24 下午1:36, Peter Hutterer wrote:
> > > > On Fri, May 24, 2019 at 01:25:52PM +0800, Hui Wang wrote:
> > > > > On 2019/5/23 下午2:01, Peter Hutterer wrote:
> > > > > > On Wed, May 22, 2019 at 09:40:30AM +0200, Pali Rohár wrote:
> > > > > > > On Wednesday 22 May 2019 07:30:43 Xiaoxiao Liu wrote:
> > > > > > > > Hi Pali,
> > > > > > > > 
> > > > > > > > Ok, and cannot you set ALPS_DUALPOINT flag based on that
> > > > > > > > alps_check_is_trackpoint() result and then update
> > > > > > > > alps_process_packet_ss4_v3() code to supports also
> > > > > > > > V8 trackpoint packets?
> > > > > > > > --> Yes, we can do like so, when we use the v8 method to process the trackpoint , the mouse speed is not ideal.
> > > > > > > >         Then we choose the standard mouse driver.
> > > > > > > Mouse speed is something which is configurable. Have you configured it
> > > > > > > somehow? Also there is libinput project should handle these settings
> > > > > > > more properly.
> > > > > > > 
> > > > > > > Adding Peter Hutterer, maintainer of libinput to loop. I think he could
> > > > > > > help with this problem.
> > > > > > libinput has a quirk for a magic multiplier on trackpoints. it was the only
> > > > > > solution I found that came close to "working" given that every device seems
> > > > > > to provide some other random magic data. Doc for it is here:
> > > > > > https://wayland.freedesktop.org/libinput/doc/latest/trackpoint-configuration.html
> > > > > Hello Peter Hutterer,
> > > > > 
> > > > > To adjust the trackpoint speed from userspace:
> > > > > 
> > > > > If the libinput version is lower than 1.9.0, we could set
> > > > > POINTINGSTICK_CONST_ACCEL=0.25
> > > > > 
> > > > > If the libinput version is higher than 1.12.0, we could set
> > > > > AttrTrackpointMultiplier=0.25
> > > > > 
> > > > > But if we use libinput-1.10.0,  how could we adjust the speed?
> > > > The LIBINPUT_ATTR_TRACKPOINT_RANGE property, which didn't end up working
> > > > well (hence why it got replaced again). See the docs here though:
> > > > https://wayland.freedesktop.org/libinput/doc/1.10.0/trackpoints.html
> > > > 
> > > > Cheers,
> > > >     Peter
> > > 
> > > OK, got it, Thanks.
> > 
> > Is not here some database where for input device name / id is specified
> > that property? So users do not have to invent what is correct value for
> > their hardware?
> 
> yeah, libinput ships with a quirks database that sets those, but it relies
> on users to submit the quirks.
> https://gitlab.freedesktop.org/libinput/libinput/tree/master/quirks

That is enough!

> There's no "correct" value anyway, if you ask 3 users what the trackpoint
> should do you'll get 5 answers :)

I know :) but reason for such database is to provide some sane defaults.
Which seems it is already there.

-- 
Pali Rohár
pali.rohar@...il.com