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#1 2023-03-03 19:17:58

hyperbolicblue
Member
Registered: 2020-12-01
Posts: 5

[SOLVED] Trackpoint of Dell Latitude E5550 very fast in -x and -y dir

Hi everyone,

Since I updated my system on March 1st 2023, the Trackpoint of my Dell Latitude E5550 behaves unexpectedly: I can move the cursor fine as long as I move it in +x and/or +y direction, but as soon as I try to move it to the left and/or bottom edge of the screen, it moves very fast to the top right corner of the screen.

It's not a hardware issue, since everything works fine if I boot a Linux Mint live iso via USB. The output of xinput via xinput list 'AlpsPS/2 ALPS DualPoint Stick' and xinput list-props 'AlpsPS/2 ALPS DualPoint Stick'" seems to be OK; the output on my archlinux (where the Trackpoint doesn't work) is identical to the output of the live iso (where it works fine).

The output of libinput record /dev/input/event10 (which is the Trackpoint) shows that the movement along +x and +y are fine: The report for movement to the right edge of the screen is

- evdev:
    - [  0, 615714,   2,   0,       1] # EV_REL / REL_X                     1
    - [  0, 615714,   0,   0,       0] # ------------ SYN_REPORT (0) ---------- +90ms

whereas the report on the -y direction is:

- evdev:
    - [  0,  76911,   2,   1,    -255] # EV_REL / REL_Y                  -255
    - [  0,  76911,   0,   0,       0] # ------------ SYN_REPORT (0) ---------- +76ms

Note the -255, which I get for movement towards the bottom of the screen; I get +255 for movement to the left; for movement to the top/right I get -1/1, respectively.

I surely didn't change any configs, maybe some kernel modules are at fault here. I don't know which files might have changed to cause this or where to look. libinput device quirks don't seem to apply here (at least libinput record does not report any).

Any ideas on what's causing this behavior or how to fix it?

Thanks!

Edit: Marked as solved.

Last edited by hyperbolicblue (2023-04-11 19:29:03)

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#2 2023-03-03 20:24:09

werapea
Member
Registered: 2023-03-03
Posts: 1

Re: [SOLVED] Trackpoint of Dell Latitude E5550 very fast in -x and -y dir

I face the same issue as you on the E5550, a temporary fix is to downgrade the kernel to an older version  (for me it was simply doing:

sudo pacman -U /var/cache/pacman/pkg/linux-6.1.8.arch1-1-x86_64.pkg.tar.zst

you could try a higher version i don't know what version exactly is affected), also this fixes a related issue of touchpad having different speed/acceleration between horizontal and vertical axis.

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#3 2023-03-03 20:41:04

hyperbolicblue
Member
Registered: 2020-12-01
Posts: 5

Re: [SOLVED] Trackpoint of Dell Latitude E5550 very fast in -x and -y dir

Thanks for the confirmation and the workaround, werapea!

The issue seems to be with linux 6.2.1.arch1-1, whereas 6.1.14-1-lts works fine.

I'm glad that I can use the trackpoint again, and that I have the LTS kernel installed. smile

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#4 2023-04-11 19:28:02

hyperbolicblue
Member
Registered: 2020-12-01
Posts: 5

Re: [SOLVED] Trackpoint of Dell Latitude E5550 very fast in -x and -y dir

Issue solved with linux 6.2.10-arch1-1.

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