[Bug 601986] [NEW] Disk driver problems on Toshiba NB305Netbook

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Running
Description:	Ubuntu 10.04 LTS
Release:	10.04
Linux jim-nb 2.6.32-24-generic #38~pre201007021000-Ubuntu SMP Sun Jul 4 06:49:54 UTC 2010 i686 GNU/Linux
But problem seen on all kernels tried.

Boot process hangs for ~7 minutes, then machine starts.  Booting with
init=/bin/bash and running "hdparm -t /dev/sda5" (sda5 is my ubuntu fs)
gives ~500kB/sec.  Completing the upstart process brings disk up to ~40
MB/sec.

When " bootchart" is installed machine boots in 23 seconds!  Resume from
hibernate works.  Investigation has shown that a compiled C program with
an infinite loop, when run in the background from init-top in the
intramfs will also cure the slow boot.  The C-program saturates one of
the two processors of the Atom N450 (~100% CPU1).  It appears that
bootchart works its magic by simply saturating one CPU.  After boot,
running the inifinite loop program brings disk performance (as reported
by hdparm) up from 40 MB/sec to 70 MB/sec.

Adding highres=off nohz=off to the kernel command line cures slow disk
problem but machine runs hot with lower battery life.  Adding nohpet to
the kernel command line also cures the slow boot but not the resume from
suspend.

I suspect that the problem lies with ahci.ko or libata.  Changing the
BIOS disk parameter from ahci to compatibility also cures the problem...
but screws up the existing Windows partition.

Tried the linux-image-2.6.35-020635rc3-generic_2.6.35-020635rc3_i386.deb
kernel.  It acts the same.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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Disk driver problems on Toshiba NB305Netbook
https://bugs.launchpad.net/bugs/601986
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