All I have installed Fedora core 9 ppc on the Intellistation 275 and the Intellistation was flawless. I to have the problem with the color. The Graphics adapter in the 275 is the IBM GXT4500P. The resolution is 1280 by 1024 but the colors are off. In the Screen back ground of a picture of the earth, the earth appears to be a desert planet. On the screen back ground of the lady bugs on the leaf, the leaf is a proper shade of green but the lady bugs are real blue blue.
I have a source file of a driver of a graphics adapter (I don't know if it is a general frame buffer driver or a real graphics adapter driver for the GXT4500P), from a guy that works for IBM that I have not complied yet. (I know just enough about programing to realize that it may be beyond my capabilities).
If some body wants to take a crack at it let me know and I will email it to you.
There is a caveat about Linux on Power on IBM Pseries. For the power PC processor IBM machines I use SUSE 9 ppc. However it doesn't work on the Power 4 and power 5 processors. I suspect it has something to do with the dual core processor architecture.
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Jim Dauven