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kernel bug: Touch jump detected and discarded [solved]
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josephg
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PostPosted: Sun Sep 23, 2018 2:22 am    Post subject: kernel bug: Touch jump detected and discarded [solved] Reply with quote

So now that I've become a bit more observant looking for kernel bugs, I found something in my Xorg.0.log the tail end of which is below
Code:
[    41.366] (II) config/udev: Adding input device SynPS/2 Synaptics TouchPad (/dev/input/event7)
[    41.366] (**) SynPS/2 Synaptics TouchPad: Applying InputClass "libinput touchpad catchall"
[    41.366] (**) SynPS/2 Synaptics TouchPad: Applying InputClass "libinput touchpad catchall"
[    41.366] (II) Using input driver 'libinput' for 'SynPS/2 Synaptics TouchPad'
[    41.366] (**) SynPS/2 Synaptics TouchPad: always reports core events
[    41.366] (**) Option "Device" "/dev/input/event7"
[    41.366] (**) Option "_source" "server/udev"
[    41.367] (II) event7  - SynPS/2 Synaptics TouchPad: is tagged by udev as: Touchpad
[    41.367] (II) event7  - SynPS/2 Synaptics TouchPad: device is a touchpad
[    41.368] (II) event7  - SynPS/2 Synaptics TouchPad: device removed
[    41.383] (**) Option "Tapping" "On"
[    41.383] (**) Option "config_info" "udev:/sys/devices/platform/i8042/serio1/input/input6/event7"
[    41.383] (II) XINPUT: Adding extended input device "SynPS/2 Synaptics TouchPad" (type: TOUCHPAD, id 10)
[    41.384] (**) Option "AccelerationScheme" "none"
[    41.384] (**) SynPS/2 Synaptics TouchPad: (accel) selected scheme none/0
[    41.384] (**) SynPS/2 Synaptics TouchPad: (accel) acceleration factor: 2.000
[    41.384] (**) SynPS/2 Synaptics TouchPad: (accel) acceleration threshold: 4
[    41.385] (II) event7  - SynPS/2 Synaptics TouchPad: is tagged by udev as: Touchpad
[    41.385] (II) event7  - SynPS/2 Synaptics TouchPad: device is a touchpad
[    41.386] (II) config/udev: Adding input device PC Speaker (/dev/input/event3)
[    41.386] (II) No input driver specified, ignoring this device.
[    41.386] (II) This device may have been added with another device file.
[   193.069] (II) Axis 0 value 5734 is outside expected range [1271, 5672]
See https://wayland.freedesktop.org/libinput/doc/1.10.7//absolute_coordinate_ranges.html for details
[  2133.682] (EE) event7  - SynPS/2 Synaptics TouchPad: kernel bug: Touch jump detected and discarded.
See https://wayland.freedesktop.org/libinput/doc/1.10.7/touchpad_jumping_cursor.html for details
[  3213.553] (II) Axis 0 value 5735 is outside expected range [1271, 5672]
See https://wayland.freedesktop.org/libinput/doc/1.10.7//absolute_coordinate_ranges.html for details
[  6213.716] (II) Axis 0 value 5725 is outside expected range [1271, 5672]
See https://wayland.freedesktop.org/libinput/doc/1.10.7//absolute_coordinate_ranges.html for details
[  9213.756] (II) Axis 0 value 5695 is outside expected range [1271, 5672]
See https://wayland.freedesktop.org/libinput/doc/1.10.7//absolute_coordinate_ranges.html for details
[ 11609.810] (EE) event7  - SynPS/2 Synaptics TouchPad: kernel bug: Touch jump detected and discarded.
See https://wayland.freedesktop.org/libinput/doc/1.10.7/touchpad_jumping_cursor.html for details
[ 12259.200] (II) Axis 0x1 value 4604 is outside expected range [1255, 4600]
See https://wayland.freedesktop.org/libinput/doc/1.10.7//absolute_coordinate_ranges.html for details
[ 15272.829] (II) Axis 0 value 5673 is outside expected range [1271, 5672]
See https://wayland.freedesktop.org/libinput/doc/1.10.7//absolute_coordinate_ranges.html for details
[ 18285.236] (II) Axis 0 value 5688 is outside expected range [1271, 5672]
See https://wayland.freedesktop.org/libinput/doc/1.10.7//absolute_coordinate_ranges.html for details
[ 21313.200] (II) Axis 0 value 5735 is outside expected range [1271, 5672]
See https://wayland.freedesktop.org/libinput/doc/1.10.7//absolute_coordinate_ranges.html for details
[ 24376.036] (II) Axis 0 value 5676 is outside expected range [1271, 5672]
See https://wayland.freedesktop.org/libinput/doc/1.10.7//absolute_coordinate_ranges.html for details
[ 27376.140] (II) Axis 0 value 5709 is outside expected range [1271, 5672]
See https://wayland.freedesktop.org/libinput/doc/1.10.7//absolute_coordinate_ranges.html for details
[ 30414.141] (II) Axis 0 value 5735 is outside expected range [1271, 5672]
See https://wayland.freedesktop.org/libinput/doc/1.10.7//absolute_coordinate_ranges.html for details
[ 33417.816] (II) Axis 0 value 5690 is outside expected range [1271, 5672]
See https://wayland.freedesktop.org/libinput/doc/1.10.7//absolute_coordinate_ranges.html for details
[ 36667.483] (II) Axis 0 value 5734 is outside expected range [1271, 5672]
See https://wayland.freedesktop.org/libinput/doc/1.10.7//absolute_coordinate_ranges.html for details
[ 39744.539] (II) Axis 0 value 5734 is outside expected range [1271, 5672]
See https://wayland.freedesktop.org/libinput/doc/1.10.7//absolute_coordinate_ranges.html for details
[ 42766.209] (II) Axis 0 value 5734 is outside expected range [1271, 5672]
See https://wayland.freedesktop.org/libinput/doc/1.10.7//absolute_coordinate_ranges.html for details
[ 45778.755] (II) Axis 0 value 5694 is outside expected range [1271, 5672]
See https://wayland.freedesktop.org/libinput/doc/1.10.7//absolute_coordinate_ranges.html for details
[ 48278.438] (EE) event7  - SynPS/2 Synaptics TouchPad: kernel bug: Touch jump detected and discarded.
See https://wayland.freedesktop.org/libinput/doc/1.10.7/touchpad_jumping_cursor.html for details
[ 48784.856] (II) Axis 0 value 5735 is outside expected range [1271, 5672]
See https://wayland.freedesktop.org/libinput/doc/1.10.7//absolute_coordinate_ranges.html for details
[ 51784.872] (II) Axis 0 value 5703 is outside expected range [1271, 5672]
See https://wayland.freedesktop.org/libinput/doc/1.10.7//absolute_coordinate_ranges.html for details
[ 54811.682] (II) Axis 0 value 5734 is outside expected range [1271, 5672]
See https://wayland.freedesktop.org/libinput/doc/1.10.7//absolute_coordinate_ranges.html for details
[ 58230.760] (II) Axis 0 value 5682 is outside expected range [1271, 5672]
See https://wayland.freedesktop.org/libinput/doc/1.10.7//absolute_coordinate_ranges.html for details
[ 61261.452] (II) Axis 0 value 5723 is outside expected range [1271, 5672]
See https://wayland.freedesktop.org/libinput/doc/1.10.7//absolute_coordinate_ranges.html for details
[ 61272.861] (EE) event7  - SynPS/2 Synaptics TouchPad: kernel bug: Touch jump detected and discarded.
See https://wayland.freedesktop.org/libinput/doc/1.10.7/touchpad_jumping_cursor.html for details
[ 64422.113] (II) Axis 0 value 5709 is outside expected range [1271, 5672]
See https://wayland.freedesktop.org/libinput/doc/1.10.7//absolute_coordinate_ranges.html for details
[ 66573.529] (EE) event7  - SynPS/2 Synaptics TouchPad: kernel bug: Touch jump detected and discarded.
See https://wayland.freedesktop.org/libinput/doc/1.10.7/touchpad_jumping_cursor.html for details


I don't know what to make of these. My touchpad seems to be working fine since the last reboot, and I haven't noticed any issues. I don't think I have changed or specified any coordinates anywhere. But that mention of kernel bug makes me a bit jumpy.
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Last edited by josephg on Tue Sep 25, 2018 10:43 am; edited 1 time in total
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josephg
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PostPosted: Tue Sep 25, 2018 10:42 am    Post subject: Reply with quote

i changed libinput to evdev in /etc/portage/make.conf, and all issues seem to have disappeared.
Code:
INPUT_DEVICES="evdev synaptics"


no more kernel bug about touch jump, and i don't think my touchpad is multitouch.
my ranges are correctly identified as well.

so much trying to keep up with bleeding edge :( i think i'm quite happy to trail behind, and rather be stable.
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khayyam
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PostPosted: Tue Sep 25, 2018 1:01 pm    Post subject: Reply with quote

josephg wrote:
so much trying to keep up with bleeding edge :( i think i'm quite happy to trail behind, and rather be stable.

josephg ... it's not considered bleeding edge upstream ("this driver can be used as as drop-in replacement for evdev and synaptics") ... it's the new broken.

best ... khay
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josephg
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PostPosted: Wed Sep 26, 2018 12:20 am    Post subject: Reply with quote

I thought Gentoo changed from evdev/synaptics to libinput sometime ago.
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