Apple Magic Trackpad: pointer freezes on 3 or 4 finger touch using a "Cambridge Silicon Radio" bluetooth dongle.

[Raul Dinegri]

Hello, when i use three fingers, the pointer disappears and cursor freeze

I am using an PC with USB Bluetooth, o Magic Trackpad works with one tap and two tap, but when using with three, four or more fingers don't works....

When use three fingers, the cursor locked and after an time show "loves handled"

Is it possible disable "loves handled"?

Someone knows why this happen?

[Raul Dinegri (dinegri)]

I'm used utouch-evemu to register events

the files are in attached

[Henrik Rydberg (rydberg)]

Thanks for the data. The sequence shows 1 down, 1 up, 2 down, 2 up, 3 down. Nothing out of the ordinary.

The problem seems to be unity here. Disable the handles (run ccsm, disable "unity MY grab handles"), restart, and it seems to work better. I have seen the freeze also without the handles, but only at the first X restart after disabling the handles.

[Raul Dinegri (dinegri)]

Hi, tanks for the help

I disabled "Unity MY grab handles",

  1. I restarted X but the problem continued...
  2. I reboot the PC but the problem continued...
  3. I started without compiz but the problem continued...

it very strange

the worst what's i have no any track

[Raul Dinegri (dinegri)]

Hi, I found out because of problems in the Magic Trackpad, it was because of usb bluetooth dongle.

Model

Cambridge Silicon Radio, Ltd Bluetooth Dongle
USB Bluetooth 1.1

I bought other and works fine

I was seeing in another forums, and others people it was with the same problems

Thanks a lot

Problem solved

[Omer Akram (om26er)]

Closing the bug as it was a hardware issue. feel free to report any other bugs you may find.

[bleathem (bleathem)]

I am also getting this same problem with my Apple Magic Trackpad on my Lenovo T540 running Ubuntu 14.04. I am using only the bluetooth built-in to the laptop, no external dongle.

My trackpad worked fine on older T510 running Ubuntu 12.04.

[Jalal Albasri (jalal-albasri)]

If the problem lies with the hardware can anyone recommend a make/manufacturer/model for a Bluetooth dongle that works?

[Andrew de los Reyes (andrew-launchpad-w)]

We've had this same issue on Chrome OS for a while. Today I dug into it and posted my findings here. https://code.google.com/p/chromium/issues/detail?id=214588#c22

Of particular interest to this crowd is that using we see the mouse trying to retransmit the packet with 3 fingers.

I also found the issue to be based on the BT adapter's manufacturer: Broadcom/Atheros work, but Intel didn't. I didn't have a Cambridge Silicon adapter handy to test.

[Daniel van Vugt (vanvugt)]

What works (in my experience): Any bluetooth dongle that's not a "Cambridge Silicon Radio" :)

Unfortunately you can't really know if you have one without plugging it in and listing USB device information.