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I have MediaTek MT7922 in my laptop. After an update, it stopped working with "No controller available".
Dmesg output: "Bluetooth: hci0: Failed to get device id (-108)"
Tried both latest kernel 7.1.5 and LTS 6.18.
I also checked rfkill and the USB power management settings. They did not cause this problem.
After downgrading linux-firmware and linux-firmware-mediatek to version 20260519-1, it works again.
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Nevermind, it was probably caused by laptop-mode's autosuspend, adding an exclusion for the device fixed the issue.
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