Comment 10 for bug 493834

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): 720x400@70Hz
(II) RADEON(0): 640x480@60Hz
(II) RADEON(0): 640x480@75Hz
(II) RADEON(0): 800x600@60Hz
(II) RADEON(0): 800x600@75Hz
(II) RADEON(0): 1024x768@60Hz
(II) RADEON(0): 1024x768@75Hz
(II) RADEON(0): 1280x1024@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.