The last one is the easier one I think. In savagetex.c in savageUpdateTex0State_s4 and savageUpdateTex1State_s4 there is a pretty fancy computation of the 9bit LOD bias (probably some fixed point format) from a floating point value. The lodbias mesa demo shows no visible change of the LOD bias, so it's either broken in hardware or the formula is wrong. Can you try to find a formula that looks right by comparing with indirect rendering?
Or the state isn't being sent to the card correctly. Even if the value isn't calculated correctly, changing the hardware state should change what is displayed.
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