Ginn is not suspend/resume safe

[Christian Schürer-Waldheim]

I know that ginn is in early development but as I have the Apple magic trackpad I'm eager for ginn and try to help by testing it.

What I've observed is that ginn is not suspend/resume safe. The trackpad is connected via bluetooth and switches off/disconnects when I suspend the computer, so after a resume, the trackpad is not available. But ginn is trying to read/get data from it and consumes 100% of the cpu (core).

I did a strace on ginn and this is the output after resume (only the last few lines - the first line is the debug output of the last gesture event):

write(1, "\tattr touch 1 y=509.246765\n", 27 attr touch 1 y=509.246765
) = 27
read(3, 0xe9abb4, 4096) = -1 EAGAIN (Resource temporarily unavailable)
select(4, [3], NULL, NULL, NULL) = ? ERESTARTNOHAND (To be restarted)
select(4, [3], NULL, NULL, NULL) = 1 (in [3])
read(3, "\"\0\v\0\2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\260yF\2\0\0\0\0", 4096) = 32

There is no further output after resume, even if I power on the device. It stops at the last read. Stracing a newly started ginn, the output is:

read(3, 0xa70bb4, 4096) = -1 EAGAIN (Resource temporarily unavailable)
select(4, [3], NULL, NULL, NULL) = 1 (in [3])
read(3, "#\236\v\0\23\0\0\0\0\0d\0\3\0\n\0\221\347{\3Z\1\0\0Z\1\0\0\243=@\0"..., 4096) = 108
write(1, "Gesture type 0 updated\n", 23Gesture type 0 updated
) = 23

I hope this info helps to make ginn aware of suspends - I guess it just has to stop the read operation and try it again.

[Mohamed IKBEL Boulabiar (boulabiar)]

Ginn is an application using geis. The problem seems to come from there (or maybe a lower layer).

Thanks a lot for reporting this bug !

[José Expósito (jose-exposito89)]

Hi!

I had the same problem in Touchégg, but solve it is easy, only is necessary to suscribe to input devices with "geis_input_devices" and use a semaphore, adding 1 to it when a device is added and removed 1 from it when a device is removed.
Later, in the loop to get gestures only is neccesary wait if the semaphore is 0.

You can see the code here:
https://code.google.com/p/touchegg/source/browse/touchegg/src/touchegg/gestures/collector/GestureCollector.cpp

Anyway, if you need help, I can make a patch for ginn with this feature ;)
Greetings!

[Linus Seelinger (s-linus)]

On my Natty machine, this problem does not occur on sleep. However, after killing the X-server, it does. Can that also be solved?

[Bijan Binaee (bijanbina)]

it affect me too and i think it's not ginn bug

[Dražen Lučanin (kermit666)]

I've noticed it on my Macbook Pro on its internal trackpad. Once the computer wakes from sleep the ginn process goes wild and consumes 100% CPU. I have to kill it to quiet down the fan humming.