I really do think that the problem is with the AHCI driver in Ubuntu. I presume that using "compatibility" mode, drops one back to IDE driver mode and I see (ps -=ef) that ata_sff and ata_aux are loaded and running. I see mention of ata_piix in dmesg but not as a loaded process after the machine boots. I have seen other threads where people say that using ata_piix kills disk performance. I don't know enough about disk drivers on Ubuntu to really say much... but overall... the problem on the NB305 sure seems to be how the AHCI driver and the timer interact. Turning off AHCI brings the system back to normal ... although I have not tested disk performance (or how it affects CPU load) extensively.
-- Disk driver problems on Toshiba NB305Netbook https://bugs.launchpad.net/bugs/601986 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
