The La-e791p follows a but with HP-specific SIO enabling.

When you open the LA-E791P Rev 2.0 schematic, you will be greeted with dozens of pages. Focus on these five critical sections:

like a "no power" state or a "caps lock blinking" error code? HP 15-bs526ur LA-E791P Rev:2.0 BID 08328 Bios + EC

💡 Search with the exact board number and “Rev 2.0 schematic” in quotes.