Bug#773976: Aggressive link power management breaks devices without sleep support

[Yuri D'Elia <wavexx@thregr.org>]

On 01/02/2015 09:21 PM, Ben Hutchings wrote:
>>> Can you test whether the attached patch works for you?

I rebuilt the kernel using debian/bin/test-patches [your patch].
Got this after a few minutes:

[ 1049.098578] ata1.00: exception Emask 0x0 SAct 0x2000 SErr 0x50000 action 0x6 frozen
[ 1049.098587] ata1: SError: { PHYRdyChg CommWake }
[ 1049.098594] ata1.00: failed command: READ FPDMA QUEUED
[ 1049.098602] ata1.00: cmd 60/08:68:f8:c8:d5/00:00:09:00:00/40 tag 13 ncq 4096 in
         res 40/00:00:01:01:80/00:00:00:00:00/00 Emask 0x4 (timeout)
[ 1049.098605] ata1.00: status: { DRDY }
[ 1049.098612] ata1: hard resetting link
[ 1049.418880] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[ 1049.419345] ata1.00: supports DRM functions and may not be fully accessible
[ 1049.428068] ata1.00: supports DRM functions and may not be fully accessible
[ 1049.436350] ata1.00: configured for UDMA/133
[ 1049.450905] ahci 0000:00:1f.2: port does not support device sleep
[ 1049.450991] ata1: EH complete