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Cc:     Peter Hutterer <peter.hutterer@who-t.net>,
        Xiaoxiao Liu <xiaoxiao.liu-1@cn.alps.com>,
        dmitry.torokhov@gmail.com, XiaoXiao Liu <sliuuxiaonxiao@gmail.com>,
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        Xiaojian Cao <xiaojian.cao@cn.alps.com>,
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From:   Hui Wang <hui.wang@canonical.com>
Message-ID: <d0b659bf-e6ed-bbbb-a3ab-17daf525a577@canonical.com>
Date:   Fri, 24 May 2019 15:37:57 +0800
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On 2019/5/24 下午3:26, 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?

Since the libinput version in the ubuntu 18.04 is 1.10,  I tried to set 
LIBINPUT_ATTR_TRACKPOINT_RANGE with different values (from 25, 20, 10, 
5) in the udev hwdb database, I checked it with "udevadm info 
/dev/input/eventX" to confirm the value is set to 
LIBINPUT_ATTR_TRACKPOINT_RANGE successfully, but looks like the cursor 
speed doesn't change at all. So for ubuntu 18.04,  looks like we have to 
adjust the speed in the kernel driver.

Thanks,

Hui.