*khem, khem* So now, I come with real mystery. It may be not directly related to HEN as-is, but charging while hostmode was "introduced" here by joerg, so problems with hostmode is even less good thread for that (cause hen is working here like charm).

Apart from powering with Y-cable, i tried using external-powered USB 2.0 hub, to not only deliver power to USB peripherials, but also charge N900 while hostmode.

It worked like a charm, but one thing is beyond my understanding. When i deliver power to hub using stock N900 charger (through a homebrew adapter, especially for having less chargers to carry when travel), N900 is hapilly charging through hub, at 300 mA rate + power need to operation with peripherials, its about 1500 mA at all (so current_now is -300 mAh, cause battery "get" 300 mA more than is pulled from it)

but, when i power my hub through modified ATX power supply - much more powerful than N900 charger - N900 is barely charging at all, with current_now fluctuating from -50 to +50 (so, part of the time it isn't charging at all, power pushed into battery is little less than used by N900).

I already confirmed that N900 itself is not using more power at this moment - exact same conditions as with powering hub by N900 charger. For some reasons, power delivered to charging N900 is less.

I tested (using multimeter) both N900 charger and ATX power supply current delivered through hub - that is, tested current at USB cable connecting to N900 (of course, tests were made UNCONNECTED to N900). N900 charger was delivering 1,5A, as expected. ATX power supply was delivering 2.0 A - HUB do its job by limiting current going through it to exactly 2A (4 ports X500 mA).

I tested it 5 times for each combination, restarting HEN, connecting, disconnecting, etc. The result is, that when N900 have 1.5A available power at USB cable, thanks to charger.sh it uses it all. When it have 2A available, it uses only about 1A.

Someone able to explain that phenomena?

// edit

Main reason why i posted it here, is because i hope that this may help in development of new HEN version with charging during hostmode - behavior, when N900 charge less when more power available is strange, to say at least. And probably related to some stock components (mbe? just guessing) so maybe jrbme will use that additional info...