I have already followed a long checklist for properly installing the USB
drivers for my Nexus 7 (2013) running Android 4.4.4, on host Windows 7 SP1.
What I mean is:
- I am using the Google USB Driver that came with Android SDK Manager,
revision 11.
- I have cycled through all of the USB protocol combinations to make
sure the device drivers are installed:
- PTP only, MTP only, PTP+ADB, MTP+ADB, ADB only
- I have made sure that for each protocol where ADB is enabled, I can
connect to the device via ADB and issue shell commands, list files, etc.
- I have also made sure that if I toggle the USB protocol combinations
(between PTP/MTP), the ADB connection stays alive.
However, what annoys me is that:
- The ADB connection will sometimes just drop, for no apparent reason.
- Sometimes this happen when the device is idle; sometimes it happens in
the middle of application testing.
To reconnect, I toggle through the protocol combinations (between PTP/MTP).
During idle time this is no problem, but when it happens during application
testing, the testing has to be restarted from beginning.
I would like to get some ideas (or, conspiracy theories) about why this
could possibly happen.
Note: this is my only test device and workstation I can use for Android
development.
ADB_TRACE seems to only print the communications between the ADB client and
ADB daemon - it doesn't seem to print out USB communications which I think
is relevant to this issue.
Just as a hypothesis, I have also tried the "Developer Options - Stay
awake", and on Windows Device Manager - USB Hub - Uncheck "Allow computer
to turn off this device to save power". Disconnection is less frequent but
still occurs.
(Before I use those two options, the disconnection happens within 3 seconds
of establishing a fresh new ADB connection.)
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