Hardware: Lenovo ThinkPad T490 (Intel Core i7-8650U, Intel UHD Graphics 620)
Distribution: RakuOS Fedora 44 based
Kernel: 7.2.11-rakuos.2.v3.fc44.x86_64
Symptoms:
Tap-to-click became increasingly unreliable — sometimes needing many taps before registering. Physical left/right click works fine, cursor movement works fine, touchpad responds to finger motion, just taps are inconsistent.
What worked:
Tried all the usual settings tweaks in System Settings → Input Devices → Touchpad with no effect. The issue persists across reboots.
What fixed it:
Added this kernel parameter in RakuOS System → System → Kernel Parameters:
psmouse.synaptics_intertouch=0
After reboot, tap-to-click is fully functional again.
Notes:
This matches a known regression with ThinkPad Synaptics touchpads in kernel 7.1.8 / 7.2.x series (reported on Fedora discussion forums for multiple ThinkPad models). Some users may need to try =1 instead of =0 depending on their hardware revision.
Downside (minor): Three/four-finger gestures may be slightly less consistent with =0, but for most daily use this is a reasonable trade-off.
For reference, this is a kernel-level issue, not specific to RakuOS — same bug affects Fedora Workstation, Silverblue, and other distros on affected kernels.
Hope this saves someone else some troubleshooting time!