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USB problems in 12.04

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I got two problems with my USB drive and I badly need a solution asap for these. Please help me out.

My USB devices run very slow in Ubuntu. Though I have 1.1 ports on my laptop, I used to get speed of 20-25mbps for my Seagate USB hard disk while using Windows. But in Ubuntu it's hardly 500-800kbps. The problem persists with pen drives and USB mouse, etc.
Secondly, Ubuntu does not recognize my USB devices unless inserted before boot. I am not able to find them in lsusb output even if inserted after the boot.

edited Oct 7 '12 at 4:23

Peachy
2,82141430

asked Oct 6 '12 at 4:19

user94867
1

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