Public bug reported:

My PC has an ATI Radeon 7200 graphics card (PCI connections), and a
built-in Intel chipset. When using the standard i386 feisty livecd, x
fails to configure itself properly.

If I use the normal boot option, it goes to a black screen after the
boot splash, and nothing further happens. If I switch my monitor to the
Intel port, it displays garbage.

If I boot in safe graphics mode, I get an x server error after the boot
splash. The gist of the error message is that no device was found at PCI
location 1:8:0. When I view the xorg.conf file from nano, there is only
one device listed, which appears to be the correctly configured Intel
chip. The screen section uses this device.

I managed to get it to work by adding a device to xorg.conf with the
PCIBus location as "1:8:0", and the driver as "radeon". I then changed
the screen section to use the new device rather than the Intel. After
saving that modification and starting x, I have working, 3d accelerated
graphics.

It seems to me that this isn't a driver issue, it is simply an issue of
x not detecting the graphics card properly. I also have this issue with
the edgy livecd, although the safe graphics mode in edgy gives a blank
screen rather than an error.

** Affects: Ubuntu
     Importance: Undecided
         Status: Unconfirmed

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ATI Radeon 7200 not detected by x in livecd.
https://bugs.launchpad.net/bugs/108327
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