Re: [PATCH] Bluetooth: btmtk: Disable remote wakeup for MT7922/MT7925

[Michal Pecio <michal.pecio@gmail.com>]

On Mon, 29 Jun 2026 03:01:19 +0000, Chris Lu (陸稚泓) wrote:
> Hi Rong,
> 
> Thanks for your understanding. We hope to find a better way to handle
> this issue.
> 
> 
> Hi Luiz,
> 
> Regarding this issue, MediaTek Bluetooth team has already initialed an
> internal investigation for problematic combination and will seek
> assistance from AMD SOC team to investigate the root cause of this
> issue.

Hi,

I have seen multiple reports on Arch Linux forum of MTK Bluetooth chips
sporadically locking up and no longer enumerating on AMD systems, also
desktops, which had to be unplugged from power to restore operation.

I have also seen claims that auto power management is broken in btusb:
https://lore.kernel.org/linux-bluetooth/cover.1774348119.git.berto@igalia.com/T/#u

This, if true, offers a plausible theory because:
- URBs issued to suspended devices may fail, drivers may not notice,
  make wrong assumptions about their HW state and confuse the chip
- USB core doesn't reliably block submission of such URBs
- they were also seen to break some xHCI controllers, in theory this
  might be an HC problem - power cycling resets both device and HC

Regards,
Michal