[clug] Really slow USB after suspend to ram

Andrew Janke a.janke at gmail.com
Sat Dec 5 18:31:44 MST 2009

> My partner has an IBM Thinkpad X61 with Ubuntu 9.04, running the
> 2.6.28-16 kernel.
> If I plug in a USB hard drive I see pretty good transfer rates:
> $ sudo hdparm -t /dev/sdb
> /dev/sdb:
>  Timing buffered disk reads:   90 MB in  3.03 seconds =  29.68 MB/sec

The X61 has some "advanced" power saving features in which devices are
put into D3 and other slower states to save power. Have you tried it
with and without the machine plugged in?

I for example have a completely non-functional SD card reader on my
X61 under XP but under Ubuntu/Vista it is fine....  rarrgh!  I have
found that keeping the BIOS up to date (there have been a few fixes as
of late) is critical in keeping the thing working. Beyond that it is
still a very nice bit of kit.

Andrew Janke
(a.janke at gmail.com || http://a.janke.googlepages.com/)
Canberra->Australia    +61 (402) 700 883

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