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 13:50:53 +0800
From:   Hui Wang <hui.wang@...onical.com>
To:     Peter Hutterer <peter.hutterer@...-t.net>
Cc:     Pali Rohár <pali.rohar@...il.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 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.


>>> There are also different speeds depending on which xorg driver you'd use (or
>>> libinput/Wayland), so a "mouse speed is not ideal" is almost a guarantee,
>>> given a large enough variety of setups :) That's why we have the speed
>>> toggle, but I'm happy to hear any suggestions on how to make the trackpoint
>>> more useful (in libinput anyway).
>>>
>>>> I do not think it is a good idea to force back to generic PS/2 mouse
>>>> driver for touchpads and trackpoints. Native drivers for touchpads and
>>>> trackpoints supports multitouch, absolute reporting and lot of other
>>>> things... Also calculation of mouse speed from absolute positions on
>>>> touchpads can be more easily fixed as from emulated relative movements.
>>> Yeah, agree. Using PS/2 mouse drivers means you lose *all* the extra
>>> features touchpads have like palm detection, tapping, scrolling, gestures,
>>> etc.
>>>
>>> Cheers,
>>>      Peter
>>>
>>>> Dmitry, what is your opinion about this problem? What should psmouse.ko
>>>> do in this situation? Disallow usage of absolute mode and force bare
>>>> PS/2 relative mode?