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Old 09-26-2008, 01:52 AM
axion axion is offline
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Idea Solution for problems with usb-stick with prolific controller

Hello, I have a fix for this problem after having posted it for a differently branded stick, but with the same prolific controller on bugzilla.

See bugzilla #11640

Whenever you create multiple partitions or a non fat(32) file system in a partition on the stick the inquiry of the stick timeouts. The default linux timeout is set for 5 secs, and the stick takes 14.5 seconds. So if you set the timeout to 15 seconds or more, and reinsert the stick, the stick should be mountable and readable. Just remember to add this to your boot scripts, or repeat it every time you reboot the kernel.

The inquiry timeout can be set to 15 sec with the following command line:
echo 15 >/sys/module/scsi_mod/parameters/inq_timeout
Or if you prefer the grub command line is :
I hope this longer timeout will someday be standard for the kernel. Or maybe part of an exception list when a prolific 2528 stick is detected.


Last edited by axion; 09-27-2008 at 08:39 PM. Reason: 2528 not 2825
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Old 09-26-2008, 12:21 PM
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RAM GUY RAM GUY is offline
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Thank you for posting this and I have made it a sticky for the time being.
Support accounts and tickets can be created at
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Old 09-27-2008, 08:41 PM
axion axion is offline
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Default Thank you

Will keep everyone updated.
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Old 09-27-2008, 08:47 PM
axion axion is offline
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Default update..

------- Comment #10 From Monchi 2008-09-25 22:36:35 [reply] -------

Could this longer inq timeout become part of a greylisted usb-stick chipset ?
Because many people on the corsair forum have the same problem. Different sick
manufacturer same usb->flash controller.

------- Comment #11 From Alan Stern 2008-09-26 07:12:26 [reply] -------

I don't know -- the inq_timeout setting is global, affect every SCSI device
added to the system, not just an individual USB device. However testing shows
that Windows XP uses a timeout of 20 seconds for USB storage devices.

I'll ask on the SCSI development mailing list.
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linux, prolific, timeout

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