** Description changed:

  Binary package hint: linux-image-2.6.20-16-generic
  
  linux-image-2.6.20-15-generic worked fine with following system:
  feisty, xfs root fs (all in one) on (single) SATA disk on an intel ICH5 SATA 
controller (I965 chipset)
  
  after upgrading to linux-image-2.6.20-16-generic, the SATA disk is no more 
under control of ata_piix, which is not loaded anymore,
  SATA disk becomes /dev/hdc (/dev/hda being the DVD drive) instead of /dev/sda 
as with 2.6.20-15
  
  with boot option "irqpoll" I was able to save dmesg and lsmod outputs,
  without "irqpoll" option, boot fails, even into single user mode.
  
  --------------------------------------
  klmonz 2007-05-31
  this bug is already described well in debian bug # 419458 [ 
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=419458 ]
- and is as well fixed by a new (debian) kernel package.
- [never heard about debian? well, ubuntu is in fact "kind of a debian clone"] 
< hopefully, guys more concerned with the story you can live with that 
expression; it is meant for people who really don't know debian>
+ which is already fixed  in a new kernel package (for debian, NOT ubuntu!)
  
  in the debian bug record a simple verification can be found
  1) find pci device codes for IDE and SATA controllers with 
  lspci -nn
  part of the output on my machine:
  ...
  00:1f.1 IDE interface [0101]: Intel Corporation 82801EB/ER (ICH5/ICH5R) IDE 
Controller [8086:24db] (rev 02)
  00:1f.2 IDE interface [0101]: Intel Corporation 82801EB (ICH5) SATA 
Controller [8086:24d1] (rev 02)
  ....
  
  2) search for SATA device codes in modules.pcimap for both kernels:
  on my machine:
  kernel 2.6.20-16:
  [EMAIL PROTECTED]:/lib/modules/2.6.20-16-generic$ grep "24d1"  modules.pcimap
  piix                 0x00008086 0x000024d1 0xffffffff 0xffffffff 0x00000000 
0x00000000 0x0
  ata_piix             0x00008086 0x000024d1 0xffffffff 0xffffffff 0x00000000 
0x00000000 0x0
  
  kernel 2.6.20-15
  [EMAIL PROTECTED]:/lib/modules/2.6.20-15-generic$ grep "24d1"  modules.pcimap 
  ata_piix             0x00008086 0x000024d1 0xffffffff 0xffffffff 0x00000000 
0x00000000 0x0
  
  so it is obvious that with 2.6.20-16 the SATA controller is claimed by both 
piix (IDE driver) and ata_piix (SATA driver);
  that's where the problem arises.
  
  So I would hope some ubuntu kernel guru would take a closer look onto
  this now (how to trigger this? I'm afraid there's a lot of stuff coming
  in here every day...)
+ 
+ *****
+ sorry for updating that often, I kept typing nonsense/mistakes :-|

** Tags added: ata piix

-- 
SATA disk is in PATA mode with kernel 2.6.20-16-generic (piix claiming SATA 
controller on ICH4/ICH5 boards)
https://bugs.launchpad.net/bugs/116996
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