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DW1830 Bluetooth not available (power saving issue?)

Joined
Feb 18, 2014
Messages
58
Motherboard
Gigabyte H370 HD3
CPU
i5-8400
Graphics
GTX 1080
Mac
MacBook Pro
Classic Mac
LC, Power Mac, PowerBook
Mobile Phone
Android, iOS
On my Lenovo Thinkpad x250 I have the same problem: Bluetooth works fine when AC is attached, but without AC on battery no Bluetooth hardware is available.

I have in /L/E/
- BrcmFirmwareData
- BrcmPatchRAM2
 
Joined
Mar 24, 2019
Messages
2
Motherboard
Maximus VI Impact
CPU
4790k
Graphics
Radeon 570
Exactly the same issue on a Thinkpad X260. This on the latest bios (1.43), freshly patched ACPI files per the guide, properly mapped USB ports and USB power properties and everything else working perfectly.

This appears to be a particular issue with the BCM20703A1 revision. I see on thedarkvoid's repo the latest update to the old BrcmPatchRam notes state 'BCM20703A1 fix'.

I have tried loading various firmwares from .414 all the way up to .481, which I found on a newer driver (latest is .422 on RehabMan's repo). The behaviour is the same: the firmware loads correctly after sleep only on AC power.

On battery, wake results in the device detected as BCM2045A0 and it disconnects when attempting to use it or by itself after a few minutes.

The device only works properly when detected as BCM920703. Why that happens... I have no idea.
 
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