I am trying to migrate an installed Xubuntu 12.04 to a new mainbaord with 890GX chipset. The Chipset has a built-in Radeon HD 4290 graphics. The system boots, but X won't start.
The most suspicious message in Xorg.0.log is "ddxSigGiveUp: Closing log".

When searching for this message, I found some answers like "remove your xorg.conf" (but there is none on my system). Or bug reports for fglrx (but that's not installed on my system). Or NVidia-related questions ...

Interestingly, "startx" succeeds in opening a basic XFCE session.

Then, I tried to disable the onboard graphics in the BIOS setup and use the old PCIe graphics card (Radeon HD 5450). No change. I don't think I can just blacklist a module, because the graphics card and the onboard graphics are covered by the same module.

At the moment, use the free radeon drivers, not the restricted fglrx driver. If possible, I would like to stay on the free driver for two reasons:

• The fglrx driver from the ubuntu packages fails to build the kernel module.
• In past, I had bad experiences with the fglrx driver and changing screen config with RandR.

When I connect the harddisk and the graphics card to my old mainboard, everything works again. This means, I have not screwed up my system configuration wile installing and removing the fglrx drivers.

When I ordered this mainboard, I thought the 890GX is old enough to be supported and if not, I could still use my graphics card as backup solution. But without even the backup soluton, I'm screwed ...

Any ideas ?

Thanks and Regards, Kubuntu-Man (now switched to Xubuntu)