#Uefitool options greyed out Bluetooth#
#Uefitool options greyed out series#

On Cherry Trail devices the device-mode phy is build into the SoC, so on most Cherry Trail devices this just works. If you get 'ulpi:v0000p0000' instead then your hardware does not have a device-mode phy and you cannot use gadget mode. On a kernel with UDC enabled you can check if your hardware has such a phy by doing: 'cat /sys/bus/ulpi/devices/dwc3.4.auto.ulpi/m odalias' if there is a phy this will usually return 'ulpi:v0451p1508'. On Bay Trail devices an external device-mode USB-PHY is necessary for device-mode to actually work.

#Uefitool options greyed out series#

Here is the interesting part of the IFR for changing the Wifi/BT model:ĠxC521 One Of: WIFI, VarStoreInfo (VarOffset/VarName): 0x110, VarStore: 0x1, QuestionId: 0x1AB, Size: 1, Min: 0x0, Max 0x2, Step: 0x0 Īnd then running 'setup_var_3 0xda 1' on the grub commandline results in a new '00:16.0 USB controller: Intel Corporation Atom Processor Z36xxx/Z37xxx Series OTG USB Device' entry showing up in lspci.Īctually using this requires a kernel with UDC (USB Device Controller) support enabled as well as some USB gadget drivers, at least the Fedora kernel does not have these enabled by default. The flashrom packaged in Fedora dumped the BIOS in one go and after build UEFITool and ifrextract from source from their git repos I could extract the interface description for the BIOS Setup menus without issues (as described in the blogpost). Some duckduckgo-ing found this blogpost on changing locked BIOS settings. So instead of going for the DSDT-override I really want to be able to change that BIOS option and set it to the right value. There was an option in the BIOS which actually controls what HID gets advertised for the Wifi/BT named 'WIFI' which was set to 'RTL8723' which obviously is wrong, but that option was grayed out. Now I could have easily fixed this with an extra initrd with DSDT-overrride but that did not feel right. The UART connected BT part was described in the ACPI tables with a HID (Hardware-ID) of 'OBDA8723', not good. Under Linux I quickly found out why, the device actually uses a Broadcom Wifi/BT chipset attached over SDIO/an UART for the Wifi resp.

#Uefitool options greyed out Bluetooth#

This all started with a Mele PCG09 before testing Linux on this I took a quick look under Windows and the device-manager there showed an exclamation mark next to a Realtek 8723BS bluetooth device, so BT did not work.