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For 2560x1440 you need an active DP to dual-link DVI adapter and a dual link DVI cable. Most likely you only had a passive DP to single-link DVI adapter.


You can see in your dmesg the order of discovery of the graphics chips. If they vary with the time, you could perhaps fix this compiling your stuff in your kernel not as a module. Or trying a workaround putting a rule that indicate the order of loading for the modules concerned...

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