Kernel 2.6.25 doesn't boot: can't find root device

Hey,
Upgrading from 2.6.24 -> 2.6.25 didn't really work, some strange things happened...
It was some time ago since I upgraded so the following packages were updated:
udev, glibc, kernel-headers, nvidia, kernel26,mkinitcpio,klibc-udev,klibc-extras,klibc
I rebooted and it gave an error like this:
ERROR: Failed to parse block device name for '/dev/hda2'
unknown
ERROR: root fs cannot be detected: Try using ......
Fallback kernel gives the same error.
So it can't find that disk. I booted in knoppix, added the "pata" hook in mkinitcpio since that was not there yet
before it was:
HOOKS="base udev autodetect scsi sata filesystems"
I changed it to
HOOKS="base udev autodetect pata scsi sata filesystems"
Reinstalled the kernel (pacman -S kernel26), rebooted, didn't work. Back to knoppix, searched a bit and found out that pata changes devices into sda. So I changed my grub/menu.lst and fstab and rebooted. Still same error. Fallback kernel the same error.
Changed the pata hook into ide and changed the names back to hda. Rebooted and still the same error. Tried that configuration with sda, still the same error.
So I reverted all the installed packages to the old ones, including klibc-udev etc and I removed the ide hook, so it's HOOKS="base udev autodetect scsi sata filesystems" again.
Rebooted and still the same error!!!! After some testing in the grub bootmenu, I found a config that works: the fallback kernel and the sda naming scheme.
Does anyone have a clue what is going on here?? Why can't I use hda and the normal kernel anymore, even if I reverted all the new programs? Some config file or something? Udev that uses new names?
And any ideas why the new kernel doesn't work?
Thanks a lot!! If you need more information, please ask and I will provide it.
Grtz

to answer both questions:
menu.lst:
root (hd0,1)
kernel /boot/vmlinuz26 root=/dev/sda2 vga=795 ro
initrd /boot/kernel26.img
root (hd0,1)
kernel /boot/vmlinuz26 root=/dev/sda2 vga=795 ro
initrd /boot/kernel26-fallback.img
fstab:
/dev/sda2 / ext3 defaults 0 0
But those should be correct since it booted before.
About mkinitcpio -p kernel26, the output that gives me is the output pacman -S kernel26 gives and I also performed the mkinitcpio command manually as suggested in some other forum threads
When booting today (with 2.6.24 fallback and sda naming scheme), I got a kernel panic, he couldn't find the root device... Rebooting did the trick, then it could boot all of a sudden! Is it somehow possible that my disks are getting named randomly by udev or something?

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Betwen udev-181-2 and udev-181-5, the hooks have moved from /lib/initcpio to /usr/lib/initcpio. But mkinitcpio -L should still list them.
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This is from pacman.log, from when I updated on 12/30.
[2009-12-30 10:19] synchronizing package lists
[2009-12-30 10:20] starting full system upgrade
[2009-12-30 10:29] upgraded consolekit (0.4.1-1 -> 0.4.1-2)
[2009-12-30 10:29] upgraded hdparm (9.27-1 -> 9.27-2)
[2009-12-30 10:29] upgraded libdrm (2.4.16-1 -> 2.4.17-2)
[2009-12-30 10:29] upgraded libgl (7.6-2 -> 7.7-1)
[2009-12-30 10:29] upgraded intel-dri (7.6-2 -> 7.7-1)
[2009-12-30 10:29] upgraded kernel26-firmware (2.6.31-1 -> 2.6.32.2-2)
[2009-12-30 10:29] >>> Updating module dependencies. Please wait ...
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[2009-12-30 10:29] >>> ----------------
[2009-12-30 10:29] >>> If you use LVM2, Encrypted root or software RAID,
[2009-12-30 10:29] >>> Ensure you enable support in /etc/mkinitcpio.conf .
[2009-12-30 10:29] >>> More information about mkinitcpio setup can be found here:
[2009-12-30 10:29] >>> http://wiki.archlinux.org/index.php/Mkinitcpio
[2009-12-30 10:29]
[2009-12-30 10:29] >>> Generating initial ramdisk, using mkinitcpio. Please wait...
[2009-12-30 10:29] ==> Building image "default"
[2009-12-30 10:29] ==> Running command: /sbin/mkinitcpio -k 2.6.32-ARCH -c /etc/mkinitcpio.conf -g /boot/arch/kernel26.img
[2009-12-30 10:29] :: Begin build
[2009-12-30 10:29] :: Parsing hook [base]
[2009-12-30 10:29] :: Parsing hook [udev]
[2009-12-30 10:29] :: Parsing hook [autodetect]
[2009-12-30 10:29] :: Parsing hook [pata]
[2009-12-30 10:29] :: Parsing hook [scsi]
[2009-12-30 10:29] :: Parsing hook [sata]
[2009-12-30 10:29] :: Parsing hook [usb]
[2009-12-30 10:29] :: Parsing hook [filesystems]
[2009-12-30 10:29] :: Generating module dependencies
[2009-12-30 10:29] :: Generating image '/boot/arch/kernel26.img'...SUCCESS
[2009-12-30 10:29] ==> SUCCESS
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[2009-12-30 10:29] :: Begin build
[2009-12-30 10:29] :: Parsing hook [base]
[2009-12-30 10:29] :: Parsing hook [udev]
[2009-12-30 10:29] :: Parsing hook [pata]
[2009-12-30 10:29] :: Parsing hook [scsi]
[2009-12-30 10:30] :: Parsing hook [sata]
[2009-12-30 10:30] :: Parsing hook [usb]
[2009-12-30 10:30] :: Parsing hook [filesystems]
[2009-12-30 10:30] :: Generating module dependencies
[2009-12-30 10:30] :: Generating image '/boot/arch/kernel26-fallback.img'...SUCCESS
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I'll try running mkinitcpio though.
Edit: from the chroot'd shell:
[ root@ubuntu ] [ / ]
[ # ] > mkinitcpio -p kernel26
==> Building image "default"
==> Running command: /sbin/mkinitcpio -k 2.6.32-ARCH -c /etc/mkinitcpio.conf -g /boot/arch/kernel26.img
:: Begin build
:: Parsing hook [base]
:: Parsing hook [udev]
:: Parsing hook [autodetect]
:: Parsing hook [pata]
:: Parsing hook [scsi]
:: Parsing hook [sata]
:: Parsing hook [usb]
:: Parsing hook [filesystems]
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==> SUCCESS
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:: Begin build
:: Parsing hook [base]
:: Parsing hook [udev]
:: Parsing hook [pata]
:: Parsing hook [scsi]
:: Parsing hook [sata]
:: Parsing hook [usb]
:: Parsing hook [filesystems]
:: Generating module dependencies
:: Generating image '/boot/arch/kernel26-fallback.img'...SUCCESS
==> SUCCESS
[ root@ubuntu ] [ / ]
[ # ] > ls /boot/arch
kernel26-fallback.img kernel26.img
I'll try booting with both the disk by UUID and the disk named as /dev/sdb3 in the Grub commands.
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