I experienced a hang at the same point at another system yesterday where
I first updated some packages, then turned off the machine, changed
monitors and then trying to boot again.

The hang on this second machine was more persistent as detaching
monitors doesn't result in a continued boot. As I still have a 9.04
installation on that system on another partition I tried to boot that
and it boots without hangs and just as expected.

I then tried to change boot options for the karmic kernel in grub and
"fbdev=no" or "vga=normal" works.

So this seems to be some kind of framebuffer issue.

The strange thing here is the following:

At the first mentioned machine I chagned from CRTs to the 30" Dell LCD
which doesn't provide supported standard timings through EDID/DDC so I
could understand the issue there. On the other hand the exact same
monitor worked previously with a HD2400PRO on another machine and also
works with a HD4770 on the same machine.

At the second machine I changed from a Dell 30" LCD + 22" CRT to 19"
Dell LCD + 22" CRT and in addition the 19" Dell LCD does provide
supported standard timings through EDID/DDC (excerpt from Xorg.0.log):

...
(II) RADEON(0): Supported established timings:
(II) RADEON(0): 720x...@70hz
(II) RADEON(0): 640x...@60hz
(II) RADEON(0): 640x...@75hz
(II) RADEON(0): 800x...@60hz
(II) RADEON(0): 800x...@75hz
(II) RADEON(0): 1024x...@60hz
(II) RADEON(0): 1024x...@75hz
(II) RADEON(0): 1280x1...@75hz
(II) RADEON(0): Manufacturer's mask: 0
(II) RADEON(0): Supported standard timings:
(II) RADEON(0): #0: hsize: 1152  vsize 864  refresh: 75  vid: 20337
(II) RADEON(0): #1: hsize: 1280  vsize 1024  refresh: 60  vid: 32897
(II) RADEON(0): Supported detailed timing:
(II) RADEON(0): clock: 108.0 MHz   Image Size:  376 x 301 mm
(II) RADEON(0): h_active: 1280  h_sync: 1328  h_sync_end 1440 h_blank_end 1688 
h_border: 0
(II) RADEON(0): v_active: 1024  v_sync: 1025  v_sync_end 1028 v_blanking: 1066 
v_border: 0
(II) RADEON(0): Serial No: 641806BK19ZA
(II) RADEON(0): Monitor name: DELL 1907FP
...

As I made package updates before I changed the monitors (for both
machines) I'll attach the dpkg.log section for the updates made before
the hanging boot.

-- 
boot hangs with Dell 3007WFP-HC at Radeon X1950XTX
https://bugs.launchpad.net/bugs/493834
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