The Linux Elantech V3 touchpad driver for an old 2013 laptop of mine (and most laptops of the similar era) has been broken since 2019 (reports half the size compared to actual coordinates, offsets vertical coordinates, so the entire right half is interpreted as edge scroll). I debugged and proposed a fix months ago, and there's been no motion towards merging it: https://lore.kernel.org/linux-input/20221014111533.908-1-nya.... Evidently, the amount of "run stuff and see if it breaks" they're doing so far is insufficient for niche hardware.

Additionally the in-tree Realtek R8169 driver fails to redetect Ethernet being plugged in after I unplug it for 5-10 seconds, and I had to resort to the out-of-tree R8168 driver as a workaround.