BIOS BLUETOOTH SUPPORT

It seems that the AM4 motherboards in the shop all lack support for the BIOS to use a bluetooth keyboard and mouse. The old Acer E700 does have Firewire but it does not have bluetooth.

There is a lot of bluetooth hardware and looking at the event viewer in windows: USB bluetooth devices are very low cost and all machines should have Bluetooth so that peripherals work properly such as headphones and mice etc..

The Lenovo laptops all have full support suggesting it is not a complex solution to add support as the old machines do not have a very large BIOS by comparison to modern machines. UEFI can handle this today easily.

The Apple MacBook (2015) has integrated bluetooth which is part of the Wi-Fi logic in the main VLSI. This machine has worked well using a bluetooth mouse etc.

Bluetooth is tightly integrated with the Ethernet functions. There is a MAC assigned to the hardware that the BIOS needs to keep track of but that is all. The lack of support is one of the reasons desktop users are not able to use a wireless speaker etc. PCIe Wi-Fi cards have bluetooth and this the best solution as there is lots of power for highly sensitive radios. USB tends to be underpowered at best.

Bluetooth is backwards compatible. The problem is that it is low energy so signal propagation is problematic.

STATE MASK 0x2491F7FFFFF

Windows cannot store Bluetooth authentication codes (link keys) on the local adapter. Bluetooth keyboards might not work in the system BIOS during startup. The local adapter does not support an important Low Energy controller state to support peripheral mode.  The minimum required supported state mask is 0x2491f7fffff, got 0x1fffffff.  Low Energy peripheral role functionality will not be available.

This seems to be a system error. It has been seen with Intel drivers but not with RealTek drivers in the studio machines. Intel ia aware of the defect and Microsoft is also aware. There are 5 laptops and 3 desktop machines all equipped with bluetooth. The machines are not all in use as the primary desktopias more suited as a workstation. A bluetooth keyboard and mouse are used in the studio.

HP Support Assistant has been reported as offering Bluetooth drivers for machines that do not have that capability. The Windows native driver works with most Bluetooth controllers but several proprietary solutions exist.

Why this “The minimum required supported state mask is 0x2491f7fffff, got 0x1fffffff.  Low Energy peripheral role functionality will not be available error” occurs is not really clear. The driver stack is pretty standard. Bluetooth 4.2 LE may not exist on some WiFi cards with Bluetooth 4.0 support. Given this error was spawned by Windows 10 version 2004 it suggests Microsoft changed the driver stack with the new Bluetooth 5.0 components. There are several revisions to the Bluetooth standards which complicated driver development.

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