** Description changed:

  Release: 9.04
  Installed from the LiveCD, worked fine. When then booting from the HD w/o 
interaction, the PC freezes after the ubuntu progressbar is displayed with a 
black screen.
  
  If I press CTRL-ALT-F1 as soon as the progress-bar screen appears I can
  see many error messages from ATA2 similar to:
  
  [   35.845586] ata2.00: exception Emask 0x2 SAct 0x6de SErr 0x3000400 action 
0x6
  [   35.845636] ata2.00: irq_stat 0x45000008
  [   35.845678] ata2: SError: { Proto TrStaTrns UnrecFIS }
  [   35.845737] ata2.00: cmd 60/40:08:20:08:a0/00:00:01:00:00/40 tag 1 ncq 
32768 in
  [   35.845739]          res 50/00:07:ba:d6:42/00:00:25:00:00/40 Emask 0x2 
(HSM violation)
  
  along with a timeout message
  
  after some time these meessages stop. I can then press ENTER and
  {initramfs} shows up. I enter EXIT and then some more progress messages
  come, then finally the system boots up.
  
  Hardware (as reported by vista):
  
  Acer Timeline 3810T
  HD Hitachi HTS545032B9A300
  Intel ICH9M-E/M SATA AHCI Controller
  
  I also tried to install 8.10 and 9.04 with
  http://unetbootin.sourceforge.net/, but then I cannot even boot into the
  system anymore, the same error messages come up.
  
  DMESG is attached.
+ 
+ switching the SATA mode frm AHCI to IDE prevents the issue overall. I
+ consider this a workaround however and not a solution, since this
+ disables any pre-installed Vista setup.

** Tags added: acer ahci sata

-- 
ata2 exception EMask delays/prevents booting 9.04 & 8.10
https://bugs.launchpad.net/bugs/379831
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