Hello All,
Anyone else seeing this on Surface Laptop 7 Intel running Windows 11 25H2 builds?
We're having an intermittent issue, mostly on devices where users regularly use Bluetooth headsets.
When it happens, though, it's not just Bluetooth that stops working. The Surface basically loses its internal audio interfaces completely, including the built-in speakers.
USB audio devices/headsets using their own dongle continue to work.
Device Manager shows:
Intel Smart Sound Technology OED
Status: Problem
Code 10 - CM_PROB_FAILED_START
Problem Status: 0xC0000485
Driver: intcoed.inf
Version: 20.42.12134.0
The parent Intel Smart Sound Technology BUS remains started normally.
I’ve tried restarting the audio services, restarting/disabling/enabling the OED and SST BUS, and even removing the OED + PnP rescan. Nothing recovers it.
A normal Windows reboot, however, immediately fixes everything without changing the driver.
This makes me suspect an Intel SST/OED or DSP/firmware initialisation issue.
Has anyone seen this before? We're currently investigating the Intel SST/OED and DSP/firmware stack and wondering whether rolling back to a different OED driver version could resolve the issue.