I see this with Ubuntu saucy (Kernel 3.11.0-12-generic 64 bit.), on a
Thinkpad T520 as well. This seems to happen when the system is under
heavy workload and I experience system freezes at the same time (So it
does seem to have a usability impact for me).
[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
Possibly related:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/539467
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https://bugs.launchpad.net/bugs/888764
Title:
SATA link frequently resetting
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