Hi.
I recently had severe problems with a new PC. When attaching an external
USB disk I would see USB resets once in a while in /var/log/messages and
after another while the disk would disconnect and data would be lost.
Like this
Sep 13 13:30:56 rumleskaft kernel: [164642.760290] usb 1-5: reset high
speed USB device using ehci_hcd and address 3
[repeated a number of times]
Sep 13 13:31:17 rumleskaft kernel: [164663.430421] sd 2:0:0:0: Device
offlined - not ready after error recovery
Sep 13 13:31:17 rumleskaft kernel: [164663.430459] sd 2:0:0:0: [sdb]
Result: hostbyte=DID_ABORT driverbyte=DRIVER_OK,SUGGEST_OK
Sep 13 13:31:17 rumleskaft kernel: [164663.436193] usb 1-5: USB
disconnect, address 3
Sep 13 13:31:17 rumleskaft kernel: [164663.436446] sd 2:0:0:0: [sdb]
Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK
Sep 13 13:31:17 rumleskaft kernel: [164663.437711] lost page write due
to I/O error on sdb2
Sep 13 13:31:17 rumleskaft kernel: [164663.454184] lost page write due
to I/O error on sdb2
On my machine I found that disabling CPU C-states and forcing "GV3 only"
solved the problem completely. So in some cases it would seem that CPU
power management is causing timing issues (?). Can this be fixed in the
USB driver layer or does it take cooperation from the kernel's CPU power
management - or perhaps a combination of both ?
You can read more details about my issue at
http://www.fit-pc2.com/forum/viewtopic.php?f=26&t=851
Cheers
-- Jan Holst Jensen, Denmark
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