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I'm having a Dell Inspiron 1525. Suspend and resume were working correctly.

All of a sudden, when I click the suspend menu option the system doesn't get suspended. Instead, it is being locked. Viewing dmesg output reveals

[48214.876143] sky2 eth0: disabling interface
[48215.844400] PM: Syncing filesystems ... done.
[48215.872063] PM: Preparing system for mem sleep
[48215.872070] Freezing user space processes ... (elapsed 0.00 seconds) done.
[48215.873464] Freezing remaining freezable tasks ... (elapsed 0.00 seconds) done.
[48215.873582] PM: Entering mem sleep
[48215.873597] Suspending console(s) (use no_console_suspend to debug)
[48225.872091] usbhid 6-2:1.0: suspend error -5
[48225.872100] pm_op(): usb_dev_suspend+0x0/0x20 returns -5
[48225.872104] PM: Device 6-2 failed to suspend: error -5
[48225.872106] PM: Some devices failed to suspend
[48225.876917] PM: resume of devices complete after 4.807 msecs
[48226.076192] PM: resume devices took 0.204 seconds
[48226.076203] PM: Finishing wakeup.
[48226.076205] Restarting tasks ... done.
[48226.388912] sky2 eth0: enabling interface
[48226.390582] ADDRCONF(NETDEV_UP): eth0: link is not ready
[48227.894532] sky2 eth0: Link is up at 100 Mbps, full duplex, flow control rx
[48227.894999] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[48237.172073] eth1: no IPv6 routers present

In particular usbhid 6-2:1.0: suspend error -5. Google didn't find anything useful about that.

How can I further troubleshoot this matter?

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up vote 2 down vote accepted

The line

PM: Device 6-2 failed to suspend: error -5

suggests that there is a problem with suspending with that device. You can find out what is on Bus 6.2 by doing lsusb and looking at that. If the problem persists, file a bug report with "ubuntu-bug linux"

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I think there might be clues earlier in the dmesg output.


dmesg -T|grep Freez -A4

to look for particular processes that stops suspend from suspending, does it give anything?

In that case, see my answer here: How to make "suspend" option to work? on how to automatically kill them before suspend.

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