[Bug 1002829] [NEW] Updating from 11.10 to 12.04, video no longer works

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I upgraded to 12.04 on one of my machines, and when it starts the video
blanks, and the monitor reports it is no longer connected. I cannot even
start in failsafe X mode (Segmentation fault in X).

Ubuntu is running, because I can ssh to it.

The last line of dmesg is

[   35.669872] init: failsafe-x main process (1344) terminated with
status 1


lshw gives this for the display:

           *-display
                description: VGA compatible controller
                product: RS690 [Radeon X1200 Series]
                vendor: Hynix Semiconductor (Hyundai Electronics)
                physical id: 5
                bus info: pci at 0000:01:05.0
                version: 00
                width: 64 bits
                clock: 33MHz
                capabilities: pm msi vga_controller bus_master cap_list rom
                configuration: driver=radeon latency=64
                resources: irq:18 memory:d0000000-dfffffff memory:fdde0000-fddeffff ioport:ce00(size=256) memory:fdc00000-fdcfffff

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: bot-comment
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Updating from 11.10 to 12.04, video no longer works
https://bugs.launchpad.net/bugs/1002829
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