I'm also experiencing issues since ugprading to 17.04. When I switch to
another TTY (via ctrl-alt-f1) the following errors get printed to the
screen:

[ 746.341551] EXT4-fs error (device nvme0n1p7): ext4_find_entry:1463: inode 
#525023: comm NetworkManager: reading directory iblock 0
[ 746.343318] EXT4-fs error (device nvme0n1p7): ext4_find_entry:1463: inode 
#524289: comm pool: reading directory iblock 0
[ 746.356125] EXT4-fs error (device nvme0n1p7): ext4_find_entry:1463: inode 
#11272213: comm systemd-udevd: reading directory iblock 0
[ 746.356139] EXT4-fs error (device nvme0n1p7): ext4_find_entry:1463: inode 
#11272210: comm systemd-udevd: reading directory iblock 0
[ 746.356332] EXT4-fs error (device nvme0n1p7): ext4_find_entry:1463: inode 
#11272193: comm systemd-udevd: reading directory iblock 0
[ 746.356338] EXT4-fs error (device nvme0n1p7): ext4_find_entry:1463: inode 
#11272825: comm systemd-udevd: reading directory iblock 0
[ 746.356400] EXT4-fs error (device nvme0n1p7): ext4_find_entry:1463: inode 
#11272210: comm systemd-udevd: reading directory iblock 0
[ 746.474632] EXT4-fs error (device nvme0n1p7): ext4_find_entry:1463: inode 
#524539: comm unity-settings-: reading directory iblock 0
[ 746.992814] EXT4-fs error (device nvme0n1p7): ext4_find_entry:1463: inode 
#5506108: comm BrowserBlocking: reading directory iblock 0
[ 746.304451] EXT4-fs error (device nvme0n1p7): ext4_find_entry:1463: inode 
#5506117: comm BrowserBlocking: reading directory iblock 0

I also tried to run `smartctl -t long /dev/nvme0n1p7` however the
results seem to indicate that the tool doesn't work with my particular
SSD:

smartctl 6.6 2016-05-31 r4324 [x86_64-linux-4.10.0-19-generic] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Number:                       PM951 NVMe SAMSUNG 512GB
Serial Number:                      S29PNX0H611013
Firmware Version:                   BXV77D0Q
PCI Vendor/Subsystem ID:            0x144d
IEEE OUI Identifier:                0x002538
Controller ID:                      1
Number of Namespaces:               1
Namespace 1 Size/Capacity:          512,110,190,592 [512 GB]
Namespace 1 Utilization:            254,982,533,120 [254 GB]
Namespace 1 Formatted LBA Size:     512
Local Time is:                      Mon Apr 17 17:45:48 2017 AEST
Firmware Updates (0x06):            3 Slots
Optional Admin Commands (0x0017):   Security Format Frmw_DL *Other*
Optional NVM Commands (0x001f):     Comp Wr_Unc DS_Mngmt Wr_Zero Sav/Sel_Feat
Maximum Data Transfer Size:         32 Pages

Supported Power States
St Op     Max   Active     Idle   RL RT WL WT  Ent_Lat  Ex_Lat
 0 +     6.00W       -        -    0  0  0  0        5       5
 1 +     4.20W       -        -    1  1  1  1       30      30
 2 +     3.10W       -        -    2  2  2  2      100     100
 3 -   0.0700W       -        -    3  3  3  3      500    5000
 4 -   0.0050W       -        -    4  4  4  4     2000   22000

Supported LBA Sizes (NSID 0x1)
Id Fmt  Data  Metadt  Rel_Perf
 0 +     512       0         0

=== START OF SMART DATA SECTION ===
Read NVMe SMART/Health Information failed: NVMe Status 0x2002

-------------------------

I'm using a Dell XPS 15 9550. Is there anything I can do to help you
guys debug the issue?

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https://bugs.launchpad.net/bugs/1678184

Title:
  APST quirk needed for Samsung 512GB NVMe drive

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