[Bug 88746] Re: ehci_hcd module causes I/O errors in USB 2.0 devices

[cnj5]

Tested on two computers & different usb hardware & hd's.

An 8.04LTS install developed this problem. I tried a 8.1 Live CD with
2.6.27-7-generic which worked  as expected.

The fresh install of 8.1 worked until updated less than an hour later
after installing all the latest updates (inc 2.6.27-9-generic),  booting
from previous kernel -7 from grub does not fix the problem (same in
8.04LTS)   uname reports kernel -7 & rebuilding initrd is -9 not -7?

setting max_sectors seems to make a difference.

sudo modprobe -r ehci_hcd / blacklist doesn't seem to do much on 8.1,  as It still seems to be using it:
usb 4-2: new full speed USB device using uhci_hcd and address 4


HD log while copying large files 10GB + backups: time it takes goes from minutes to days,,,,  copying freezes before usb reset

usb 5-8: reset high speed USB device using ehci_hcd and address 7
sd 9:0:0:0: [sdf] Sense Key : No Sense [current] 
sd 9:0:0:0: [sdf] Add. Sense: No additional sense information
usb 5-8: reset high speed USB device using ehci_hcd and address 7
sd 9:0:0:0: [sdf] Result: hostbyte=DID_ABORT driverbyte=DRIVER_OK,SUGGEST_OK
__ratelimit: 1451 callbacks suppressed
lost page write due to I/O error on sdf1
JBD: Detected IO errors while flushing file data on sdf1

Probably related: USB dvd writer is recognised sometimes and appears to
work  occasionally goes really slow. or just produces reset error with
increasing address number. sorry haven't got round to test, as I am more
interested in getting a reliable working usb  hd backup.

-- 
ehci_hcd module causes I/O errors in USB 2.0 devices
https://bugs.launchpad.net/bugs/88746
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