It's still showing up with pcie_aspm=off (and ppa kernel):

$ cat /proc/cmdline 
BOOT_IMAGE=/boot/vmlinuz-4.11.0-041100rc6-generic 
root=UUID=e38db0de-7f52-4cab-839b-6bfb046d4665 ro acpi_rev_override quiet 
splash vt.handoff=7 pcie_aspm=off


$ dmesg
(...)
[  352.877941] ata2.00: exception Emask 0x10 SAct 0x1000000 SErr 0x4050000 
action 0xe frozen
[  352.877946] ata2.00: irq_stat 0x00000040, connection status changed
[  352.877948] ata2: SError: { PHYRdyChg CommWake DevExch }
[  352.877952] ata2.00: failed command: READ FPDMA QUEUED
[  352.877957] ata2.00: cmd 60/08:c0:18:f6:f0/00:00:11:00:00/40 tag 24 ncq dma 
4096 in
                        res 50/00:00:00:00:00/00:00:00:00:00/a0 Emask 0x10 (ATA 
bus error)
[  352.877959] ata2.00: status: { DRDY }
[  352.877963] ata2: hard resetting link
[  353.590145] ata2: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[  353.591464] ata2.00: ACPI cmd ef/10:06:00:00:00:00 (SET FEATURES) succeeded
[  353.591466] ata2.00: ACPI cmd f5/00:00:00:00:00:00 (SECURITY FREEZE LOCK) 
filtered out
[  353.591468] ata2.00: ACPI cmd b1/c1:00:00:00:00:00 (DEVICE CONFIGURATION 
OVERLAY) filtered out
[  353.591564] ata2.00: ACPI cmd 00/00:00:00:00:00:a0 (NOP) rejected by device 
(Stat=0x51 Err=0x04)
[  353.594283] ata2.00: ACPI cmd ef/10:06:00:00:00:00 (SET FEATURES) succeeded
[  353.594285] ata2.00: ACPI cmd f5/00:00:00:00:00:00 (SECURITY FREEZE LOCK) 
filtered out
[  353.594286] ata2.00: ACPI cmd b1/c1:00:00:00:00:00 (DEVICE CONFIGURATION 
OVERLAY) filtered out
[  353.594354] ata2.00: ACPI cmd 00/00:00:00:00:00:a0 (NOP) rejected by device 
(Stat=0x51 Err=0x04)
[  353.595861] ata2.00: configured for UDMA/133
[  353.595865] ahci 0000:00:17.0: port does not support device sleep
[  353.595921] ata2: EH complete
[  358.035306] ata2.00: exception Emask 0x10 SAct 0x800 SErr 0x4050000 action 
0xe frozen
[  358.035309] ata2.00: irq_stat 0x00000040, connection status changed
[  358.035310] ata2: SError: { PHYRdyChg CommWake DevExch }
[  358.035311] ata2.00: failed command: READ FPDMA QUEUED
[  358.035314] ata2.00: cmd 60/08:58:90:f8:f0/00:00:11:00:00/40 tag 11 ncq dma 
4096 in
                        res 50/00:00:00:00:00/00:00:00:00:00/a0 Emask 0x10 (ATA 
bus error)
[  358.035315] ata2.00: status: { DRDY }
[  358.035317] ata2: hard resetting link
[  358.747460] ata2: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[  358.748472] ata2.00: ACPI cmd ef/10:06:00:00:00:00 (SET FEATURES) succeeded
[  358.748474] ata2.00: ACPI cmd f5/00:00:00:00:00:00 (SECURITY FREEZE LOCK) 
filtered out
[  358.748475] ata2.00: ACPI cmd b1/c1:00:00:00:00:00 (DEVICE CONFIGURATION 
OVERLAY) filtered out
[  358.748507] ata2.00: ACPI cmd 00/00:00:00:00:00:a0 (NOP) rejected by device 
(Stat=0x51 Err=0x04)
[  358.750983] ata2.00: ACPI cmd ef/10:06:00:00:00:00 (SET FEATURES) succeeded
[  358.750985] ata2.00: ACPI cmd f5/00:00:00:00:00:00 (SECURITY FREEZE LOCK) 
filtered out
[  358.750985] ata2.00: ACPI cmd b1/c1:00:00:00:00:00 (DEVICE CONFIGURATION 
OVERLAY) filtered out
[  358.751030] ata2.00: ACPI cmd 00/00:00:00:00:00:a0 (NOP) rejected by device 
(Stat=0x51 Err=0x04)
[  358.752636] ata2.00: configured for UDMA/133
[  358.752640] ahci 0000:00:17.0: port does not support device sleep
[  358.752680] ata2: EH complete

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https://bugs.launchpad.net/bugs/1681313

Title:
  "port does not support device sleep" on Dell Precision 5520

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