SUMMARY kscreenlocker only accepts the first fingerprint registered on the system, if you have multiple registered. I have right index and right thumb enrolled, in that order, and right thumb works for sudo or polkit, but kscreenlocker only unlocks with right index and spits out "failed to match fingerprint" on right thumb. STEPS TO REPRODUCE 1. Enroll multiple fingerprints. (right index and right thumb, for example) 2. Lock your screen 3. Attempt to unlock with any fingerprint that wasn't the first to be enrolled OBSERVED RESULT "Failed to match fingerprint" EXPECTED RESULT The computer unlocks SOFTWARE/OS VERSIONS Operating System: CachyOS KDE Plasma Version: 6.4.4 KDE Frameworks Version: 6.17.0 Qt Version: 6.9.1 Kernel Version: 6.16.1-1-cachyos-bore (64-bit) Graphics Platform: Wayland Processors: 12 × AMD Ryzen 5 7600 6-Core Processor Memory: 32 GiB of RAM (30.9 GiB usable) Graphics Processor: NVIDIA GeForce RTX 3070 Manufacturer: ASRock Product Name: B650M-HDV/M.2
I'm not able to reproduce this on Plasma built from git-master. I have two fingerprints enrolled, and both allow me to unlock my session. It's clearly not a hardware or driver issue, since both your enrolled fingerprints work in situations other than the lock screen. I'll leave this open to see if anyone else can reproduce.