From mboxrd@z Thu Jan  1 00:00:00 1970
From: Aaron Ma <aaron.ma@canonical.com>
Subject: Re: PROBLEM: Changing speed on ThinkPad X1 Carbon 5th trackpoint
 causes "failed to enable mouse"
Date: Sat, 30 Dec 2017 21:54:39 +0800
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To: Sebastian Schmidt <yath@yath.de>
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I believe it should be a firmware issue on trackpoint.

There are several ways to set the speed & sensitivity:
1, udev hwdb/rules;
2, xorg conf;
3, GUI;

It seems users are rarely to use sysfs directly, so the bug is still there.

Regards,
Aaron

On 12/30/2017 05:57 PM, Sebastian Schmidt wrote:
> On Sat, Dec 30, 2017 at 02:43:16PM +0800, Aaron Ma wrote:
>> Please try:
>> $ xinput set-prop "TPPS/2 IBM TrackPoint" "libinput Accel Speed" -1
>>
>> The last value of speed can be -1 to 1.
> 
> Ah. That indeed changes the speed, thanks!
> 
> However, please let me ask again: Isn’t the sysfs interface supposed to
> work, too? I’ve got my problem resolved for Xorg now, but about every
> article on the internet refers to the sysfs interface for changing the
> speed, cf. <https://www.google.com/search?q=trackpoint+speed>.
> 
> I’m also fine with the assertion that Lenovo shipped a broken firmware,
> but I’d expect some warning in dmesg then and a reasonable fallback (to
> a regular PS/2 mouse?) then. Can we at least agree that there is a
> driver bug that ought to be fixed or a firmware bug that ought to be
> worked around?
> 
> Thanks,
> Sebastian
>