It also happens with kernel 3.13.2-031302-generic #201402061638 (from http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.13.2-trusty/)
Based on previous comment of Ilya Murav'jov I "solved" it temporally with powertop. I disabled powersaving modes of these devices: PM ejecutable para dispositivo PCI Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 1 PM ejecutable para dispositivo PCI Intel Corporation 5 Series/3400 Series Chipset 4 port SATA AHCI Controller -- 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/119730 Title: Slow SATA performance Status in “linux” package in Ubuntu: Incomplete Bug description: Hi This issue has been discussed over at http://ubuntuforums.org/showthread.php?t=447474, and seems to affect a number of us. File copy speed is very slow (roughly 5-10MBps) on SATA hard drives. Copying within the same physical drive is just as slow as copying to another physical drive. The issue occurs with GUI tools (Nautilus, Krusader) as well as at the terminal using the CP command. This has occured since upgrading to Feisty; Edgy was fine. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/119730/+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
