Sorry - posted first as text + HTML. Re-posting as plain text. Alan Stern wrote: > [Adding CC's, since this is a CPU power management issue just as much > as a USB issue.] > > On Fri, 18 Sep 2009, Jan Holst Jensen wrote: > > >> 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 >> > > For what it's worth, I haven't heard of anything like this before and I > have no idea what the answers are. My guess is that a hardware bug is > responsible for the misbehavior while in higher C states. > > Alan Stern > Could be. Hardware info for my system can be found at http://www.jan-holst.dk/linux-usb/sysconfig.txt. It is the output of /proc/version, /etc/issue and lshw. -- Jan _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
