Hi there,

Sorry for the delayed reply. Yes, I can try that. I won't be able to get to
it until this weekend, though. I really appreciate the help! I'll report
back when I have more information.

Thanks again,
Phil

On Mon, Sep 17, 2018 at 1:40 AM Kai-Heng Feng <email address hidden>
wrote:

> Would it be possible for you to do a kernel bisection?
>
> First, find the last good -rc kernel and the first bad -rc kernel from
> http://kernel.ubuntu.com/~kernel-ppa/mainline/
>
> Then,
> $ sudo apt build-dep linux
> $ git clone git://
> git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> $ cd linux
> $ git bisect start
> $ git bisect good $(the good version you found)
> $ git bisect bad $(the bad version found)
> $ make localmodconfig
> $ make -j`nproc` deb-pkg
> Install the newly built kernel, then reboot with it.
> If the issue still happens,
> $ git bisect bad
> Otherwise,
> $ git bisect good
> Repeat to "make -j`nproc` deb-pkg" until you find the commit that causes
> the regression.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1792045
>
> Title:
>   Ubuntu 18.04 external USB hard drive performance 1/10th of 16.04
>
> Status in linux package in Ubuntu:
>   Confirmed
>
> Bug description:
>   I cannot get my external 8TB sata hard drive (attached via USB 3) to
>   write faster than about 10 megabytes per second under Ubuntu 18.04. I
>   have another that writes at the expected full speed or close enough
>   (100+ MBps).
>
>   I have tried:
>
>   * Changing the enclosure from the stock to a new one
>   * Using usb-storage "quirks" options in modprobe conf files to work
> around any UAS incompatibilities with the bridge (many reports of the drive
> working at full performance when disabling UAS, no such luck for me)
>   * Checking the disk for errors
>   * Updating the kernel to the most recent mainline (4.18.6 at the time)
>   * Checking UEFI settings (I'm already on the most recent revision of the
> firmware)
>   * Applying all available updates
>   * Changing USB ports
>   * Checking dmesg for any obvious errors (dead end, I googled everything)
>
>   Again, a different external 3TB USB 3 drive does not have any write
>   speed issues at all, so it's not the computer (Intel NUC7PJYH).
>
>   However, the very same drive in both of the enclosures I have used
>   works *perfectly* in Ubuntu 16.04 on kernel 4.15.0-34 in both a live
>   session and installed. I am not sure what the difference is between
>   the two LTS versions that is causing this, but unfortunately I think
>   I've reached the end of my know-how on this.
>
>   Thank you for your time, and please let me know what other information
>   I can provide.
>
>   ProblemType: Bug
>   DistroRelease: Ubuntu 18.04
>   Package: linux-image-4.15.0-33-generic 4.15.0-33.36
>   ProcVersionSignature: Ubuntu 4.15.0-33.36-generic 4.15.18
>   Uname: Linux 4.15.0-33-generic x86_64
>   ApportVersion: 2.20.9-0ubuntu7.3
>   Architecture: amd64
>   AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path',
> '/dev/snd/hwC0D0', '/dev/snd/pcmC0D1p', '/dev/snd/pcmC0D0c',
> '/dev/snd/pcmC0D0p', '/dev/snd/controlC0', '/dev/snd/seq',
> '/dev/snd/timer'] failed with exit code 1:
>   CurrentDesktop: XFCE
>   Date: Tue Sep 11 18:33:46 2018
>   InstallationDate: Installed on 2018-09-06 (4 days ago)
>   InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64
> (20180725)
>   Lsusb:
>    Bus 002 Device 002: ID 174c:55aa ASMedia Technology Inc. ASM1051E SATA
> 6Gb/s bridge, ASM1053E SATA 6Gb/s bridge, ASM1153 SATA 3Gb/s bridge
>    Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
>    Bus 001 Device 003: ID 8087:0aaa Intel Corp.
>    Bus 001 Device 002: ID 1997:2433
>    Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
>   MachineType: Intel Corporation NUC7PJYH
>   ProcEnviron:
>    TERM=xterm-256color
>    PATH=(custom, no user)
>    LANG=en_US.UTF-8
>    SHELL=/bin/bash
>   ProcFB:
>
>   ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-33-generic
> root=UUID=b40fd1a1-0de5-40bb-b598-7f4cd53daee1 ro quiet splash vt.handoff=1
>   PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
> PulseAudio daemon running, or not running as session daemon.
>   RelatedPackageVersions:
>    linux-restricted-modules-4.15.0-33-generic N/A
>    linux-backports-modules-4.15.0-33-generic  N/A
>    linux-firmware                             1.173.1
>   SourcePackage: linux
>   UpgradeStatus: No upgrade log present (probably fresh install)
>   WifiSyslog:
>
>   dmi.bios.date: 08/21/2018
>   dmi.bios.vendor: Intel Corp.
>   dmi.bios.version: JYGLKCPX.86A.0044.2018.0821.1915
>   dmi.board.name: NUC7JYB
>   dmi.board.vendor: Intel Corporation
>   dmi.board.version: J67969-401
>   dmi.chassis.type: 35
>   dmi.chassis.vendor: Intel Corporation
>   dmi.chassis.version: 2.0
>   dmi.modalias:
> dmi:bvnIntelCorp.:bvrJYGLKCPX.86A.0044.2018.0821.1915:bd08/21/2018:svnIntelCorporation:pnNUC7PJYH:pvrJ67992-401:rvnIntelCorporation:rnNUC7JYB:rvrJ67969-401:cvnIntelCorporation:ct35:cvr2.0:
>   dmi.product.family: Intel NUC
>   dmi.product.name: NUC7PJYH
>   dmi.product.version: J67992-401
>   dmi.sys.vendor: Intel Corporation
>
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>