Comment 49 for bug 1791427

An interesting observation: I've nuked my installation again with a new Ubuntu install (I've also updated the BIOS and brought back factory settings - I just enabled S3, disabled secure boot and turned Thunderbolt support). A fresh install (WITHOUT ANY UPDATES) detects the touchpad as SynPS/2 Touchpad. As long as it stays like this, S3 and resume work fine, without issues. When I do apt update and upgrade, after restart the touchpad is detected as Synaptics Touchpad (so a bit different than before), it starts acting weird again after resume. Does anyone know a way to enforce this PS/2 mode?