Hi Joe,

The original intent of the patch was not forcing a 6Gbs drive down to
1.5Gbs after hotplug.

Noting,

SSTATUS = 275 = 0x113 = 0001 0001 0011

That corresponds to ACTIVE PM STATE | GEN1 SPEED | DEVICE DETECTED

spd = 1 (corresponds to 1.5Gbps)

One question, the print for mask came after these 2 lines of code,
right?

       /* unconditionally mask off the highest bit */
        bit = fls(mask) - 1;
        mask &= ~(1 << bit);

In your debug kernel, would please remove the following 2 lines of code
(so the code falls thru)

        if (spd > 1)
                mask &= (1 << (spd - 1)) - 1;
        else                                     <=====
                return -EINVAL;                  <===== Remove these 2 lines of 
code.

And finally, at the end __sata_set_spd_needed(), would you please print
out these values?

spd
target
*scontrol

The original patch didn't force changing mask, but, it does "return -EINVAL", I 
think it
may fix the problem just letting it fall thru to the end of 
sata_down_spd_limit(), but it would
still help to see the original debug values and these new ones with possible 
fix. Thank you.

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https://bugs.launchpad.net/bugs/1783906

Title:
  Linux 4.15 and onwards fails to initialize some hard drives

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Bionic:
  In Progress
Status in linux source package in Cosmic:
  In Progress

Bug description:
  I have two hard drives, the main hard drive is a TOSHIBA DT01ACA200
  the second backup hard drive is a Western Digital WD5003AZEX. I
  installed lubuntu 18.04.1 on the Toshiba HDD and it boots just fine,
  the issue is with the second hard drive, when installing the WD HDD
  wouldn't even come as an option to install, and after boot the WD HDD
  still wouldn't come up, this is the dmesg with the stock kernel (4.15)
  https://paste.ubuntu.com/p/kpxh94v2SK/

  ata6 is the WD HDD that refuses to work. The messages:
  [  302.107650] ata6: SError: { CommWake 10B8B Dispar DevExch }
  [  302.107658] ata6: hard resetting link
  [  307.860291] ata6: link is slow to respond, please be patient (ready=0)
  [  312.120898] ata6: COMRESET failed (errno=-16)
  [  363.445120] INFO: task kworker/u8:5:201 blocked for more than 120 seconds.
  [  363.445131]       Not tainted 4.15.0-29-generic #31-Ubuntu
  [  363.445135] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [  363.445140] kworker/u8:5    D    0   201      2 0x80000000
  [  363.445155] Workqueue: events_unbound async_run_entry_fn
  [  363.445157] Call Trace:
  [  363.445171]  __schedule+0x291/0x8a0
  [  363.445177]  schedule+0x2c/0x80
  [  363.445182]  ata_port_wait_eh+0x7c/0xf0
  [  363.445186]  ? wait_woken+0x80/0x80
  [  363.445189]  ata_port_probe+0x28/0x40
  [  363.445192]  async_port_probe+0x2e/0x52
  [  363.445196]  async_run_entry_fn+0x3c/0x150
  [  363.445199]  process_one_work+0x1de/0x410
  [  363.445203]  worker_thread+0x32/0x410
  [  363.445207]  kthread+0x121/0x140
  [  363.445210]  ? process_one_work+0x410/0x410
  [  363.445214]  ? kthread_create_worker_on_cpu+0x70/0x70
  [  363.445218]  ret_from_fork+0x22/0x40

  Repeat constantly. Also when I try to turn off the computer, the
  computer seem to freeze, the lights of the keyboard and mouse turn off
  and the computer just stay on.

  I tried Tiny Core 9.0 which has linux 4.14.10, and i didn't had this
  issue, i also installed linux 4.14 on this lubuntu 18.04 using Ukuu
  Kernel Update Utility. And with this kernel version, or any previous
  version the WD HDD does work again. Here's a dmesg of lubuntu 18.04
  with linux 4.14 and the WD HDD finally coming up at the end:
  https://paste.ubuntu.com/p/Gd3cGFbjTJ/

  Also tried with with linux 4.17 but the WD HDD would also refuse to
  work on this version. Here's another dmesg with this version:
  https://paste.ubuntu.com/p/PmNn96vZZv/

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-29-generic 4.15.0-29.31
  ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18
  Uname: Linux 4.15.0-29-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 
k4.15.0-29-generic.
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  testtest    756 F.... pulseaudio
   /dev/snd/controlC1:  testtest    756 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'NVidia_1'/'HDA NVidia at 0xfe020000 irq 22'
     Mixer name : 'Realtek ALC1200'
     Components : 'HDA:10ec0888,10ec0000,00100101 
HDA:10de0002,10de0101,00100000'
     Controls      : 56
     Simple ctrls  : 21
  Card1.Amixer.info:
   Card hw:1 'NVidia'/'HDA NVidia at 0xfcffc000 irq 16'
     Mixer name : 'Nvidia GPU 42 HDMI/DP'
     Components : 'HDA:10de0042,38422651,00100100'
     Controls      : 21
     Simple ctrls  : 3
  CurrentDesktop: LXDE
  Date: Thu Jul 26 17:10:58 2018
  HibernationDevice: RESUME=UUID=17e70869-516d-4b63-b900-e92e3c4b73b6
  InstallationDate: Installed on 2018-07-26 (0 days ago)
  InstallationMedia: Lubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180725)
  MachineType: 113 1
  ProcFB: 0 nouveaufb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-29-generic 
root=UUID=71cf0a32-7827-49be-a2c0-cd50a72c26a1 ro quiet splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-29-generic N/A
   linux-backports-modules-4.15.0-29-generic  N/A
   linux-firmware                             1.173.1
  RfKill:
   0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/30/2008
  dmi.bios.vendor: Phoenix Technologies, LTD
  dmi.bios.version: 6.00 PG
  dmi.board.name: 113-M2-E113
  dmi.board.vendor: EVGA
  dmi.board.version: 1
  dmi.chassis.asset.tag: Unknow
  dmi.chassis.type: 3
  dmi.chassis.vendor: EVGA
  dmi.chassis.version: 113-M2-E113
  dmi.modalias: 
dmi:bvnPhoenixTechnologies,LTD:bvr6.00PG:bd09/30/2008:svn113:pn1:pvr1:rvnEVGA:rn113-M2-E113:rvr1:cvnEVGA:ct3:cvr113-M2-E113:
  dmi.product.name: 1
  dmi.product.version: 1
  dmi.sys.vendor: 113

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