Public bug reported: I built a new system and installed Ubuntu 12.10. The system has the following specifications:
Samsung 840 Pro 128 GB Gigabyte P75-D3 Intel i7 3770 32 GB Ram Western Digital 1 TB Black (mounted as /home) Western Digital 3 TB Green (mounted as /media/data_drive) The initial Ubuntu 12.10 install took almost 6 hours as transfer rates were very slow. After reboot everything appeared very fast. However when I did an "apt-get update" the download took 20 seconds and the processing of lists took 19 minutes. I had 12.10 installed on another computer which was working great (older Althon system) so I installed the drive and tested the new machine. It suffered the same performance problems. I installed Windows 7 and performed speeds tests, it reported great results. I installed 12.04 onto the 1 TB drive and it did not suffer the same performance problems. Everything ran great. I then upgraded 12.10 to 13.04 (January 27, 2013) and it too suffered from the performance issue. It appears that a change between 12.04 to 12.10 impacts AHCI based systems specifically running the Intel B75 chipset. I am not certain but I think that either the motherboard is misrepresenting something (that 12.04 ignores but it impacts 12.10) or the kernel is not detecting the system correctly. I created a couple of pastebins with data collected: 12.10 Install: http://pastebin.ubuntu.com/1561660/ 12.04 Live Disk (was checked against installed version and data is mostly the same): http://paste.ubuntu.com/1565140/ I have a thread on the ubuntu forums that may provide additional details: http://ubuntuforums.org/showthread.php?t=2104709 I also started an e-mail thread to the ubuntu-users mailing list: http://ubuntu.5.n6.nabble.com/Seeking-Help-td5010422.html I have done a lot of troubleshooting and I feel that the problem must either be the kernel or the bios misrepresenting information. In either case I am stuck without any idea of where to go next with the debuging and diagnoses path. If any additional information needs to be collected, please let me know and I will work to assist. ** Affects: linux (Ubuntu) Importance: Undecided Status: Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1107150 Title: B75 Chipset I/O Problems To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1107150/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
