Also, writing back the default values to the /proc/sys/vm/... files doesn't fix the problem — so far only reboot with avoiding writing bad values helped.
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to upower in Ubuntu. https://bugs.launchpad.net/bugs/1342341 Title: upowerd kills USB performance Status in “upower” package in Ubuntu: New Bug description: After launching Kubuntu and logging in to KDE I mount a USB storage device to e.g. /mnt/tmp and try the following command: dd if=/dev/zero of=/mnt/tmp/testfile bs=16M count=100 I don't wait until it finishes, because when I press Ctrl+C, it waits several more seconds and prints that it has copied only one record and the speed was from 200 kB/s to 1.8MB/s, which is nowhere near the speed the device can operate. On the other hand, if I rename /usr/lib/upower/upowerd and restart, the same command finishes in under a minute and says the speed was >30MB/s for USB3 and ~30MB/s for USB2 devices/ports. This hasn't happened on Kubuntu 12.04, but does happen on 14.04. Running powertop at the "Tunables" tab doesn't show any difference, so it doesn't look related to autosuspend or similar things. This also happens with Kubuntu 14.04 LiveCD, not only with the already installed system. I've tested this with 3 different USB devices: Transcend JF780 16GB (in USB 3.0 and 2.0 ports), OCZ ATV 8GB (USB 2.0 device) and Seagate SRD00F2 2TB (in USB 3.0 and 2.0 ports) with identical results. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: upower 0.9.23-2ubuntu1 ProcVersionSignature: Ubuntu 3.13.0-30.55-generic 3.13.11.2 Uname: Linux 3.13.0-30-generic i686 ApportVersion: 2.14.1-0ubuntu3.2 Architecture: i386 CurrentDesktop: KDE Date: Wed Jul 16 00:29:34 2014 InstallationDate: Installed on 2014-05-26 (50 days ago) InstallationMedia: Kubuntu 14.04 LTS "Trusty Tahr" - Release i386 (20140416.1) SourcePackage: upower UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/upower/+bug/1342341/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
