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

[Hui Wang]

On 2019/5/24 äå3:26, Pali RohÃr wrote:
> On Friday 24 May 2019 13:50:53 Hui Wang wrote:
> > On 2019/5/24 äå1:36, Peter Hutterer wrote:
> > > On Fri, May 24, 2019 at 01:25:52PM +0800, Hui Wang wrote:
> > > > On 2019/5/23 äå2:01, Peter Hutterer wrote:
> > > > > On Wed, May 22, 2019 at 09:40:30AM +0200, Pali RohÃr 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.