I've now run autoport to compare in tree T440P and stock bios. I didn't get as much output as expected and not as many differences save for one.

In devicetree.cb there are changes to the config0-config3 registers. Is this notable and can it cause pcie issues? Also the subsystemid is listed for devices in autoport, is it superfluous or should I append it to the current devicetree?

Autoport

chip ec/lenovo/h8 # FIXME: has_keyboard_backlight, has_power_management_beeps, has_uwb
                                        register "beepmask0" = "0x00"
                                        register "beepmask1" = "0x86"
                                        register "config0" = "0xa7"
                                        register "config1" = "0x05"
                                        register "config2" = "0xa8"
                                        register "config3" = "0xc6"
                                        register "event2_enable" = "0xff"
                                        register "event3_enable" = "0xff"
                                        register "event4_enable" = "0xd0"
                                        register "event5_enable" = "0x3c"
                                        register "event7_enable" = "0x01"
                                        register "event8_enable" = "0x7b"
                                        register "event9_enable" = "0xff"
                                        register "eventc_enable" = "0xff"
                                        register "eventd_enable" = "0xff"
                                        register "evente_enable" = "0x9d"

Tree

                                chip ec/lenovo/h8
                                        register "beepmask0" = "0x00"
                                        register "beepmask1" = "0x86"
                                        register "config0" = "0xa6"
                                        register "config1" = "0x0d"
                                        register "config2" = "0xa8"
                                        register "config3" = "0xc4"
                                        register "has_keyboard_backlight" = "1"
                                        register "event2_enable" = "0xff"
                                        register "event3_enable" = "0xff"
                                        register "event4_enable" = "0xd0"
                                        register "event5_enable" = "0x3c"
                                        register "event7_enable" = "0x01"
                                        register "event8_enable" = "0x7b"
                                        register "event9_enable" = "0xff"
                                        register "eventc_enable" = "0xff"
                                        register "eventd_enable" = "0xff"
                                        register "evente_enable" = "0x9d"
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