The quickest way to revert to a working state:
On Linux, the hp_sdc (HP System Display Controller) or hp_sdc_mlc kernel modules handle older HP laptop and keyboard I/O. For the 11181 device, the kernel might misidentify it, causing the "Fn" keys to fail or backlighting to remain dark. A "patch" here could mean a custom kernel patch (a .diff file) that adds a new hardware quirk to drivers/hid/hid-ids.h and drivers/hid/hid-hp.c . hp development company lp keyboard 11181 patched
The Ghost in the Layout
If Windows keeps forcing the “11181 patched” driver and it breaks your keyboard, hide the update: The quickest way to revert to a working
Do not rely solely on Windows Update. Go directly to HP’s support page: the kernel might misidentify it