Failed to suspend in 3.14.1

Failed to suspend in 3.14.1

[Lluís Batlle i Rossell]

Hello,

here my PC failed to suspend due to the serial port. Disabling the serial
port in the BIOS allows the system to suspend and resume properly.

When the serial port is enabled, I get traces like those posted by different
people:
https://bbs.archlinux.org/viewtopic.php?pid=1403725

https://bbs.archlinux.org/viewtopic.php?id=180525

Basically:
[ 3228.926444] PM: Syncing filesystems ... done.
[ 3228.975076] PM: Preparing system for mem sleep
[ 3229.654850] Freezing user space processes ... (elapsed 0.002 seconds) done.
[ 3229.657505] Freezing remaining freezable tasks ... (elapsed 5.171 seconds)
done.
[ 3234.832849] PM: Entering mem sleep
[ 3234.832913] Suspending console(s) (use no_console_suspend to debug)
[ 3234.833762] sd 4:0:0:0: [sdc] Synchronizing SCSI cache
[ 3234.833841] serial 00:09: disable failed
[ 3234.833853] dpm_run_callback(): pnp_bus_suspend+0x0/0x20 returns -5
[ 3234.833857] PM: Device 00:09 failed to suspend: error -5
[ 3234.833865] sd 3:0:0:0: [sdb] Synchronizing SCSI cache
[ 3234.834061] sd 3:0:0:0: [sdb] Stopping disk
[ 3234.834986] sd 4:0:0:0: [sdc] Stopping disk
[ 3235.417070] PM: Some devices failed to suspend, or early wake event detected
[ 3235.417673] sd 3:0:0:0: [sdb] Starting disk
[ 3235.417694] sd 4:0:0:0: [sdc] Starting disk

I couldn't find any reference to a notice to kernel developers, so maybe this
letter helps.

Thank you,
Lluís.
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