After installing snapshot 20180312, the Plasma (12.3) session crashes or terminates suddenly back to the DM’s login screen (and loss of wifi connection) almost every time using two-finger scrolling. This is so frequent as to render the desktop unusable. Single-finger movements of the cursor can also cause the problem since around snapshot 20180308 but only occasionally.
This is a laptop with integrated intel GM45 chipset graphics (intel driver i915) and no display issues since Plasma 5.8.x on TW. Yes, I know it’s not the very latest snapshot - held off for other reasons.
All points to libinput which provides “a library that handles input devices for display servers and other applications that need to directly deal with input devices.”. On snapshot 20180312 I have libinput 1.10.2 and xorg-server 1.19.6, so it looks like a fix is coming with libinput 1.10.3 or I could attempt to fall back to libinput 1.9.4…
On openSUSE (TW) it’s called libinput10 at 1.10.2, and curiously the same at the older 1.9.4. As luck would have it, after February’s instability and failures, I had re-installed TW from DVD and snapshot 20180218 which has the older package.
Having now downgraded just the one libinput package to
:~> rpm -q libinput10
my TW is back to normal (with workaround), so far without any Plasma crashing. Awaiting update to 1.10.3 for the real fix. Thanks go to the Arch Linux user postings referenced above.
I’m experiencing exactly the same problem with Gnome 3.28.0 and the built-in Synaptic TouchPad on my Lenovo T430s. However, if I refrain from using the built-in touchpad and instead use an external USB (wheel) mouse it works like before the latest upgrades.