USB Port Underpowered on late 2011 Models?

[kryptticAZ]

I just replaced my early 2011 15" MBP with a late 2011 one. I use it with a 30" Apple Display that requires a Dual Link DVI adapter, which plugs in to one of the USB ports.

On my early 2011 model, I could use either USB port. On my new one, I can only use the front one. Does this mean Apple revised the power on the USB ports between the early and late 2011 models?

 

[Ramasjang]

Yes that is my experience also...
- Read it about it here on MR, but have no link to Apple or any tech sheet.

 

[mape2k]

You can check power consumption on USB devices with the help of this Link.

 

[Spadoinkles]

Why'd you replace an early-2011 with a late-2011 in the first place?

 

[mape2k]

Why'd you replace an early-2011 with a late-2011 in the first place?

Oh please....because he wanted to....!? This thread is about USB port power and not about why someone replaced his MBP. Send him a PM if you are so interested in it.

 

[Spadoinkles]

Oh please....because he wanted to....!? This thread is about USB port power and not about why someone replaced his MBP. Send him a PM if you are so interested in it.

He ought to question himself that if he's asking such a stupid question.

 

[mape2k]

He ought to question himself that if he's asking such a stupid question.

What is so stupid about his question? Granted, it is not the most urgent one but it is still a curious effect that one USB port seems to be able to supply more maximum power than the other.

The OP does not "ought to question himself" about anything... He came here for a question and seeks answer to it, not to be questioned about his buying behavior or what might have happened to his early 2011 model (maybe it broke??!).

 

[Spadoinkles]

what is so stupid about his question? Granted, it is not the most urgent one but it is still a curious effect that one usb port seems to be able to supply more maximum power than the other.

The op does not "ought to question himself" about anything... He came here for a question and seeks answer to it, not to be questioned about his buying behavior or what might have happened to his early 2011 model (maybe it broke??!).

k.

 

[GuitarG20]

to get back on topic...

i saw someone had wrote a post about this affecting the early 2011 models earlier this year, but i can't remember exactly where to find it... i know it's around, though, and maybe someone can link to it. although i've never had problems personally.

 

[kryptticAZ]

Yes, the reason I replaced my older laptop isn't important...

I always like to know the specs of my computers and when they don't behave like the old (presumably identical) model, I question why.

One of the new and interesting things about the early 2011 models was that the USB ports supplied plenty of power (1600 mA, I believe). This means that portable hard drives are more compatible and iPhones, iPads, etc. will charge faster. If the newest models can't do the same, I'd like to know.

Thanks.

 

[kryptticAZ]

Rebooted and now both USB ports power the monitor adapter fine.

I perused the Apple Forums and many people are reporting intermittent issues with the rear-most USB port on these (and the early 2011) laptops.