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I have a dual boot with Windows XP and Ubuntu 10.10. I connected my Amazon Kindle to an USB interface in XP and in Ubuntu. From XP everything works with no flaw. In Ubuntu the data exchange is perfect, but the device does not charge.

I am pretty sure that there is a trivial Linux configuration of USB power management, and probably this is a newbie question. Any suggestion? Thank you.

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My original title was edited to indicate specifically the Amazon Kindle. However, I think that the solution would be applicable more generally to any USB device. –  Halberdier May 31 '11 at 13:18
    
I did this, you may just change it back, however I think if it's device specific that will attract more views and better search results from Google :) –  slhck May 31 '11 at 15:00
    
I like it as it is, with your change and my comment :) –  Halberdier May 31 '11 at 15:06
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3 Answers

up vote 7 down vote accepted

Try ejecting Kindle drive in Nautilus or in terminal sudo eject /dev/disk/by-label/Kindle

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OK, I'll see if something happens. However, in Windows it charges both before and after ejecting, therefore I expect power and data exchange to be independent. –  Halberdier May 31 '11 at 14:03
    
After ejecting the device, as in Windows, the service message disappears to let the user read the documents, so I cannot say if it is charging or not. But I don't think that anything changes. –  Halberdier May 31 '11 at 20:39
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I was wrong saying that you can eject Kindle in Nautilus. I found multiple postings stating that you can either transfer file or charge the device, not both simultaneously. Please see this one: iamyouruser.blogspot.com/2009/03/ubuntu-eject-kindle.html –  skfd May 31 '11 at 20:57
    
The trick appears to be this: you can't charge in Linux if your system has data access. Thank you for the reference. I hope someone of the Linux team will fix it. If it can be done in Windows, it should also be possible in Linux. –  Halberdier May 31 '11 at 21:26
    
Documentation says it applies to Windows too. See amazon.com/gp/help/customer/… "Using Kindle while Charging via Kindle Micro-USB Cable". Is it not? –  skfd Jun 1 '11 at 13:13
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Check your dmesg or kernel logs - sometimes you see something about how the device has requested more power than the system is able/willing to supply. It's rare, especially because XP will charge it, but possible.

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I can't see anything related with power in dmesg: ] scsi9 : usb-storage 4-1:1.0 ] scsi 9:0:0:0: Direct-Access Kindle Internal Storage 0100 PQ: 0 ANSI: 2 ] sd 9:0:0:0: Attached scsi generic sg3 type 0 ] sd 9:0:0:0: [sdc] 6410688 512-byte logical blocks: (3.28 GB/3.05 GiB) ] sd 9:0:0:0: [sdc] Write Protect is off ] sd 9:0:0:0: [sdc] Mode Sense: 0f 00 00 00 –  Halberdier May 31 '11 at 20:35
    
Well that's certainly good - nothing hardware related. Looks like the other answer's the cause. –  Broam Jun 1 '11 at 14:35
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My problem was that the USB for kindle was connected through a USB hub. Solution from Amazon: I connected the cable directly to a USB on the computer.

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I had issues with the WiFi dongle: it didn't work on the front socket, it works now on the rear, thus I assume the power from the rear USB sockets is higher. But the Kindle was always connected through the rear, with no intermediate hub. Moreover, it works fine under Windows, therefore it should be a software reason. –  Halberdier Oct 20 '11 at 22:23
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