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 a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1792045/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
