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[13.1][KDE] Bizarre display issues on boot (sometimes)

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20s to 30s will give you the idea. Fan is not from the laptop lol. 'tis a 7970 ejector fan at 80% 4000 rpms or something.

Expertise: Linux amateur (at least in terms of the guts and conf files)
Given the nature of the problem, search engine results are heard to come by.
What's happening is that the OS goes through GRUB, begins booting successfully, then one of two things happen:
The screen goes dark, then flickers and KDE comes to life and logs in, succesful (ish) boot.
Or...it gets past GRUB, and unless I select recovery mode (nomodeset) I am treated to a completely non response (no console) psychedelic lightshow, and am forced to hard off, and try again until I boot succesfully.

This is a nicely 'lived in' install, lot
Some key background information is that I originally installed this installation as OpenSUSE 12.3 on a different system. That system's mobo died so I threw the SSD into another laptop. From Nvidia 8200M to ATI Radeon HD3100. Linux works when win don't, hurray. But, see the youtube video.


What debug logs should I be checking and where are they? Verbose boot just warns me that ata softresets are failing (while successful) and that [failed]samba isn't starting.

I think maybe I need to just rip out X and reinstall it. I tried removing some Nvidia packages, a Mesa package etc and re-installing Radeon. Also there was an abortive catalyst legacy install at some point. (after the problem).

Any assistance will be appreciated.

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