Hardware Android JoyCon Lag

[MK73DS]

Tested on an older device with Android 4.4.4 and there is no lag. Sorry for the poor gif quality but hopefully you can see that there isn't any lag

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So this is most likely a software issue and not a hardware one. I hope someone can bring Android 4.X Bluetooth drivers to Android 5.X and above

 

[jt_1258]

Tested on an older device with Android 4.4.4 and there is no lag. Sorry for the poor gif quality but hopefully you can see that there isn't any lag

View attachment 119698

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So this is most likely a software issue and not a hardware one. I hope someone can bring Android 4.X Bluetooth drivers to Android 5.X and above

alas, we have us down here on 4.x have wished for a similar thing. Wii remotes don't work on 4.x sadly since an update to the Bluetooth broke support

 

[igloo]

I have done some debugging and found the cause of the lag problem.

Because the Joy-Con and Pro Controller don't have the HIDSSRHostMaxLatency attribute in their SDP record, the Android Bluetooth stack enables sniff subrating (SSR) with max latency default value 500 ms (according to Bluetooth spec). This causes the input report rate to slow down to 2 reports per second.

Nintendo could fix this with a controller fimware update by adding the HIDSSRHostMaxLatency attribute with an attribute value of 15 ms.

It could also be fixed in the Android Bluetooth stack instead by lowering the default value or by disabling SSR for the Switch controllers. The 500 ms SSR max latency default value is hardcoded in /system/lib/hw/bluetooth.default.so.

The Bluetooth stack in older Android devices doesn't support SSR, that's why they don't lag with the Switch controller.

 

[MK73DS]

I have done some debugging and found the cause of the lag problem.

Because the Joy-Con and Pro Controller don't have the HIDSSRHostMaxLatency attribute in their SDP record, the Android Bluetooth stack enables sniff subrating (SSR) with max latency default value 500 ms (according to Bluetooth spec). This causes the input report rate to slow down to 2 reports per second.

Nintendo could fix this with a controller fimware update by adding the HIDSSRHostMaxLatency attribute with an attribute value of 15 ms.

It could also be fixed in the Android Bluetooth stack instead by lowering the default value or by disabling SSR for the Switch controllers. The 500 ms SSR max latency default value is hardcoded in /system/lib/hw/bluetooth.default.so.

The Bluetooth stack in older Android devices doesn't support SSR, that's why they don't lag with the Switch controller.

Is there a way to hack /system/lib/hw/bluetooth.default.so and rewrite the value of HIDSSRHostMaxLatency ?
Or can an app bypass, or overwrite, this attribute ?

 

[dpad_5678]

Is there a way to hack /system/lib/hw/bluetooth.default.so and rewrite the value of HIDSSRHostMaxLatency ?
Or can an app bypass, or overwrite, this attribute ?

*.so files in Android are compiled binaries. It may be easier to perform a memory edit instead.

 

[MK73DS]

*.so files in Android are compiled binaries. It may be easier to perform a memory edit instead.

And how can this be done ?

 

[guily6669]

Use a different Bluetooth manager and I think it will be fixed... DS4 on android is the same it works fine for like 30 seconds and then is like 1 second lag...

BY _DUSTY_ from XDA forums:
1. First download and install Bluetooth Auto Connect

The reason we need this app is that for some reason the controllers input starts to lagg after about 30sec after pairing it with the tablet, the only solution I found was using this application.

2. So now that we have the bluetooth application installed aswell we can open the app.
*If the app asks you to turn on Bluetooth just hit OK.
3. Now scroll down to the bottom and tap on "Advanced Options" in here you want to change the following settings:
Rety Count = 1
Rety After(Sec) = 1
Device Timeout(Sec) = 5
Continuous Connect = 2
4. When you changed these settings you can turn on the DS4 controller by pressing on the PS button.
5. Now press on the "Connect Now" button at the bottom of the Advanced Options page.

After 2-3 seconds you will be asked if it is oke to pair the controller with the tablet, select yes and tadaaaaa you have a working DS4 controller on the Nvidia Shield Tablet

So for everything works for me, even the button mapper that can be accessed by holding the Options button on the DS4.

I hope this helps a couple of people !

This worked for me on my Nvidia Shield with Dual Shock 4 from PS4 without needing root, else I would need the sixaxis app which requires root to use DS3\DS4 on android devices without Dualshock drivers...

It will probably work with Joy-cons, but sometimes it still lags, try again until it stays connected without lag, after no lag is present it will keep working unless you disconnect the controller...

 

[igloo]

For custom roms it can be fixed by changing the default value in the source code and then building the whole custom rom from source.

The value to change is in system/bt/bta/include/bta_hh_api.h

#define BTA_HH_SSR_MAX_LATENCY_DEF 800 /* 500 ms*/

Changing this to 0 will disable SSR if the controller doesn't specify HIDSSRHostMaxLatency.

 

[StraightArrow]

For custom roms it can be fixed by changing the default value in the source code and then building the whole custom rom from source.

The value to change is in system/bt/bta/include/bta_hh_api.h

#define BTA_HH_SSR_MAX_LATENCY_DEF 800 /* 500 ms*/

Changing this to 0 will disable SSR if the controller doesn't specify HIDSSRHostMaxLatency.

Are you saying this method only works with roms? I am trying to do what you have outlined but cannot find the bt/bta/include folders (I have an s7 edge). I have been able to find the bluetooth.default.so but as someone stated above it is in binary form. I have opened it using a hex editor but I don't know much to do past that. I also don't know what a memory editor is and tried downloading some but got spooked from the human verification nonsense. I feel like I'm getting close, any more help please. anyone?

 

[MK73DS]

Are you saying this method only works with roms? I am trying to do what you have outlined but cannot find the bt/bta/include folders (I have an s7 edge). I have been able to find the bluetooth.default.so but as someone stated above it is in binary form.

As mentioned in this thread on XDA , Samsung does not give the full source code of their kernel and therefore the only option you have is to try modifying AOSP kernels, which are very buggy on S7 and S7E.

 

[StraightArrow]

As mentioned in XDA , Samsung does not give the full source code of their kernel and therefore the only option you have is to try modifying AOSP kernels, which are very buggy on S7 and S7E.

I see... Why did he write us off on it not working with samsung? There are other android devices that his fix could work for, right? Pixel, Nexus, HTC... I'm surely not the only one working on this.

 

[StraightArrow]

Forgive me for being a complete noob about this but here is my thought process so far.
1. I was thinking of downgrading my s7 firmware to 4.0 but that is apparently impossible given the s7 came with 6.0 stock.
2. Since samsung is bad about AOSP, I try to modify the stock rom somehow without having to build from source. I think I may have to root my phone for this part to gain access to the .h file as I still have been unable to find it (with a root file browser from ASUS). I have no idea if this will work and I will need to give myself write access to these files.
3. Flash a custom rom like lineage OS and either see if the Bluetooth works natively, or fiddle with the files from there.
4. Flash a modified samsung source rom?
Is there anything else I should try? Which would be the best way to go about this? I'm going to start with number 2 first.
Someone would probably have a way easier time with this on a different device since samsung is notoriously closed off to modding, so please feel free to try what @igloo suggested above and let us know what happens.

 

[guily6669]

Before customizing or modding files on your android, have you tried what I told above on my last post? It works for me with DS4 which has the same lag too.

Its a official free app from playstore -> https://play.google.com/store/apps/details?id=org.myklos.btautoconnect

BY _DUSTY_ from XDA forums:
1. First download and install Bluetooth Auto Connect

The reason we need this app is that for some reason the controllers input starts to lagg after about 30sec after pairing it with the tablet, the only solution I found was using this application.

2. So now that we have the bluetooth application installed aswell we can open the app.
*If the app asks you to turn on Bluetooth just hit OK.
3. Now scroll down to the bottom and tap on "Advanced Options" in here you want to change the following settings:
Rety Count = 1
Rety After(Sec) = 1
Device Timeout(Sec) = 5
Continuous Connect = 2
4. When you changed these settings you can turn on the DS4 controller by pressing on the PS button.
5. Now press on the "Connect Now" button at the bottom of the Advanced Options page.

After 2-3 seconds you will be asked if it is oke to pair the controller with the tablet, select yes and tadaaaaa you have a working DS4 controller on the Nvidia Shield Tablet

So for everything works for me, even the button mapper that can be accessed by holding the Options button on the DS4.

I hope this helps a couple of people !

Just download it and change the settings as reported above, if it still lags, turn off bluetooth then on until it stays constantly lag free after 30 seconds which is when lag starts.

 

[MK73DS]

Forgive me for being a complete noob about this but here is my thought process so far.
1. I was thinking of downgrading my s7 firmware to 4.0 but that is apparently impossible given the s7 came with 6.0 stock.
2. Since samsung is bad about AOSP, I try to modify the stock rom somehow without having to build from source. I think I may have to root my phone for this part to gain access to the .h file as I still have been unable to find it (with a root file browser from ASUS). I have no idea if this will work and I will need to give myself write access to these files.
3. Flash a custom rom like lineage OS and either see if the Bluetooth works natively, or fiddle with the files from there.
4. Flash a modified samsung source rom?
Is there anything else I should try? Which would be the best way to go about this? I'm going to start with number 2 first.
Someone would probably have a way easier time with this on a different device since samsung is notoriously closed off to modding, so please feel free to try what @igloo suggested above and let us know what happens.

2. Having root acces does not give you access the .h files. There are part of the source code of the ROM, which is not present in your phone. Think of it like changing the recipe of a cake : the .h files are the ingredients (well, a part of them). Once you have your cake, it is not possible to modify the ingredients you put in ! The only way to have a different cake is to make it with different ingredients
3. I already tried with both 14.1 and 15.1 Lineage OS and lags are still there
4. Since Samsung does not give the full source of their ROM, it is not possible to edit the required file.

Before customizing or modding files on your android, have you tried what I told above on my last post? It works for me with DS4 which has the same lag too.

Its a official free app from playstore -> https://play.google.com/store/apps/details?id=org.myklos.btautoconnect


Just download it and change the settings as reported above, if it still lags, turn off bluetooth then on until it stays constantly lag free after 30 seconds which is when lag starts.

It doesn't work for me unfortunately :/

 

[KiiWii]

Do joycons work on Nvidia Shield TV?

 

[tunip3]

It's just a galaxy tab 4 SM-T230NU tablet, and have you tried again recently, the lag went away eventually for me, also, try rebooting the device

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I believe it worked on older version the wii mote but newer android versions broke it and it now asks for a pin iirc

leave the pin blank

 

[MK73DS]

if it still lags, turn off bluetooth then on until it stays constantly lag free after 30 seconds which is when lag starts.

The lags don't appear after some time : they are always there and not consistent at all (sometime a single short press is not registered, other times it lasts half a second, all of that being delayed by XXXXms)

 

[guily6669]

The lags don't appear after some time : they are always there and not consistent at all (sometime a single short press is not registered, other times it lasts half a second, all of that being delayed by XXXXms)

That was supposed to be used with the app I said not turning off then on without using the app it doesn't work...

It doesn't work for me unfortunately :/

Sometimes it didn't work 4 me either, but messing a bit after some point I get solid lag free connection that just keep working while using the Bluetooth autoconnect app with DS4 controller on my tablet. Without the app it's always 1 second lag and also don't register short button presses.

It's exactly what ppl reports here with the joy-cons so I think the app should work.

 

[MK73DS]

Why don't you try with Joycon then ?
For me nothing seems to work :/

 

[jt_1258]

leave the pin blank

I thought you were forced to type something into the field? I'll have to try later but I remember reading quite a few instances of it just being impossible with the newer android versions...well, newer at the time being 4.x.x