# \[Bug 60824\] \[PATCH\]\[regression\] Cambridge Silicon Radio, Ltd Bluetooth Dongle unusable

- From: \<hidden\>
- Date: 2021-05-17 13:55:52 
- List: linux-bluetooth
- Page: https://ratatoskr.run/linux-bluetooth/2021/05/9679703
- Thread: https://ratatoskr.run/linux-bluetooth/2021/05/9679703/t.md

```text
https://bugzilla.kernel.org/show_bug.cgi?id=60824

--- Comment #180 from Swyter (swyterzone@gmail.com) ---
Newer versions of the kernel should detect (most) fake CSR dongles and warn via
dmesg, check this out:
https://github.com/torvalds/linux/commit/cde1a8a992875a7479c4321b2a4a190c2e92ec2a#diff-82175cb30d8f0e6fd9fb8b83571c33aac5db6db4d5f79dd97d4255116a79c79eR1813

My mainlined patch also adds a few known workarounds, which with the latest
bluez changes seem insufficient. But when I originally submitted the patch it
made my dongle work just fine. So in theory using an older patched kernel
should work. 

Improvements are welcome, while getting a new dongle is a decent solution
ideally we'd fix the counterfeit ones enough to work as well as on Windows. The
problem is that bluez is a moving target, with new modes being introduced all
the time, regressing these fickle chips.

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