I think I see this with Ubuntu saucy (Kernel 3.11.0-12-generic 64 bit.),
on a Thinkpad T520. I see it even when running on external power and
'link_power_management_policy' set to 'max_performance':
[23391.818508] ata4: exception Emask 0x10 SAct 0x0 SErr 0x4040000 action 0xe
frozen
[23391.818513] ata4: irq_stat 0x00000040, connection status changed
[23391.818516] ata4: SError: { CommWake DevExch }
[23391.818523] ata4: limiting SATA link speed to 1.5 Gbps
[23391.818525] ata4: hard resetting link
[23392.538993] ata4: SATA link down (SStatus 0 SControl 310)
[23392.554893] ata4: EH complete
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https://bugs.launchpad.net/bugs/539467
Title:
SATA link power management causes disk errors and corruption
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