Difference between revisions of "Bluetooth Passthrough"

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(Adapter test results: add a placeholder entry for the Wii U BT module. It'd be interesting to see if it works.)
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| Asus BT-211 || ? || ? || ? || ? || ? || ? || ? || ?
 
| Asus BT-211 || ? || ? || ? || ? || ? || ? || ? || ?
 
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| Asus BT-400 || ? || ? || ? || ? || ? || ? || ? || ?
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| Asus BT-400 || 0B05 || 17CB || ? || No || ? || ? || ? || ?
 
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| Atheros AR3012 Bluetooth 4.0 || 0CF3 || 3004 || 0001 || Yes || Yes, but may stop working after HCI resets|| Yes || Perfect || Very Good
 
| Atheros AR3012 Bluetooth 4.0 || 0CF3 || 3004 || 0001 || Yes || Yes, but may stop working after HCI resets|| Yes || Perfect || Very Good

Revision as of 14:34, 25 October 2016

Since 5.0-910, Dolphin has the ability to passthrough a Bluetooth adapter for emulated Wii software. This gives emulated Wii software full control of a Bluetooth adapter, which, provided a decent, working adapter, notably allows pairing Wii Remotes to Dolphin, third-party Wii Remote support, working Wii Remote audio and more accurate connectivity.

Setting up

Linux

A udev rule has to be installed so Dolphin can use a Bluetooth adapter without having to get root privileges.

SUBSYSTEM=="usb", ATTRS{idVendor}=="YOURVID", ATTRS{idProduct}=="YOURPID", TAG+="uaccess"

Dolphin should be able to automatically unload the USB Bluetooth kernel module (assuming you have permission to; you typically need to be in the plugdev group). If not, unload it with modprobe -r btusb.

Windows

Download and open Zadig, then:

1. In the "Options" menu in Zadig, make sure "List All Devices" is enabled.

2. Select your Bluetooth adapter in the device list.

3. On the right column, select "WinUSB" then click "Replace Driver". Select "Yes" to modify the system driver.

Dolphin will be able to use the adapter after the driver is successfully installed, and until you revert back to the default Bluetooth driver.

macOS

There is currently no way to use this feature on versions newer than 10.9, because Apple removed the ability to unload the Bluetooth kernel module.

A potential solution would be to force the OS to ignore the adapter with a codeless .kext, but this hasn't been tried yet.

Android

This feature is not supported on Android.

Using passthrough mode in Dolphin

In Dolphin, open the Controller Configuration dialog, then select the "Passthrough a Bluetooth adapter" option in the Wii Remotes section.

While a game is running:

  • Wii Remotes can be synced and paired to Dolphin by using the Sync button.
  • All saved Wii Remote pairings can be reset by using the Reset button. This will also disconnect all currently connected Wii Remotes.

Advanced usage

Sync button hotkey

It is possible to use the Press Sync Button hotkey as an alternative to the buttons in the controller configuration dialog. It is designed to work just like the Wii's red sync button:

  • Pressing the hotkey will trigger a sync.
  • Holding the hotkey for 10 seconds will clear all saved pairings.

Forcing a specific adapter

If you need to use a specific adapter, instead of using the first Bluetooth adapter that is found, you can force Dolphin to use it by editing Dolphin's configuration file (Config/Dolphin.ini). In the BluetoothPassthrough section, set "VID" and "PID" to your adapter's vendor ID and product ID (that you previously converted from hex to decimal).

Troubleshooting

"Failed to open Bluetooth device: LIBUSB_ERROR_ACCESS"

This error means that Dolphin doesn't have permission to use the Bluetooth adapter.

If on Linux, make sure the udev rule is set up correctly.

"Failed to open Bluetooth device: LIBUSB_ERROR_NOT_SUPPORTED"

On Windows, this typically means that the libusb/WinUSB driver was not installed for the adapter.

"Failed to detach kernel driver for BT passthrough"

Dolphin tried to automatically unload the Bluetooth USB kernel module and failed to. Unload the module manually before starting a game to avoid this issue.

Wii Remotes do not stay paired after closing the game

This means that your adapter is likely broken and does not remember Wii Remote link keys properly. Use a different adapter to avoid this issue.

Black screen on boot

Games send a reset command to the Bluetooth adapter when they start and wait for it to be acknowledged. If you are getting a black screen for a long time (more than 10 seconds), your adapter may be stuck in a broken state and is unable to respond to any commands. Unplug the adapter and try again.

Limitations

  • The functionality and quality of the connections heavily depend on the quality of the adapter.
  • Even though most adapters work fine in passthrough mode, the only perfect adapter is the Wii's Bluetooth module (so far).
  • Save states are not very useful in passthrough mode, since loading a state will break Bluetooth connectivity.
  • Because Bluetooth Passthrough Mode skips Dolphin's emulated Bluetooth and Wii Remote code entirely, it is not possible to mix passthrough mode and emulated/real/hybrid Wii Remote. This means that netplay, TAS input, input display, etc. cannot work.

Adapter test results

Adapter VID PID Revision Works Stable Pairing Audio Range
Asus BT-211  ?  ?  ?  ?  ?  ?  ?  ?
Asus BT-400 0B05 17CB  ? No  ?  ?  ?  ?
Atheros AR3012 Bluetooth 4.0 0CF3 3004 0001 Yes Yes, but may stop working after HCI resets Yes Perfect Very Good
Atheros AR9462 Bluetooth 4.0 + HS 0B05 17D0 0001 Yes Yes No Perfect Very Good
Azio BTD-V201 0A12 0001  ? Yes Yes Yes Good Good
Azio BTD-V401  ?  ?  ? Yes  ?  ?  ? Short
Broadcom BCM20702A0 0A5C 21E8 0112 Yes (by forcing) (PR 4385)  ?  ?  ?  ?
CSL BSN23996 0A12 0001 8891 Yes Yes, except in some games Yes Good Good
CSR 8510 A10 (Generic) 0A12 0001 8891 Yes  ? No Great Good
Generic Adapter 0A12 0001 3164 Yes No No Good  ?
Intel Dual Band Wireless-AC 7260 8087 07DC 0001 Yes No, randomly stops working Yes Good Good
ISSC EDR Bluetooth Adapter 1131 1004 0373 Yes No, randomly stops working Yes, some issues with multiple Wii Remotes Short range Average
Mayflash DolphinBar Not supported
Trendnet TBW-105UB  ?  ?  ? Yes No  ? Garbage  ?
Trendnet TBW-106UB 0A12 0001 8891 Yes  ? No Some issues  ?
StarTech.com USBBT1EDR4 (Class 1)  ?  ?  ? Yes  ?  ? Short range  ?
StarTech.com USBBT2EDR4 (Class 2)  ?  ?  ?  ?  ?  ?  ?  ?
Wii Bluetooth Module 057E 0305  ? Yes Yes Yes Perfect Perfect
Wii U Bluetooth Module  ?  ?  ?  ?  ?  ?  ?  ?