Comment 13 for bug 1606103

From https://bugs.freedesktop.org/show_bug.cgi?id=97163#c15, I think it's just a matter of some modelines missing from the xf86DefaultModes array in xf86DefModeSet.c, eg I suspect that adding this:

/* 2560x1440 59.96 Hz (CVT 3.69M9) hsync: 89.52 kHz; pclk: 312.25 MHz */
        {MODEPREFIX, 312250, 2560,2752,3024,3488,0, 1440,1443,1448,1493,0, V_NHSYNC | V_PVSYNC, MODESUFFIX},

will give me my missing 2560x1440 mode. My xserver builds but I still haven't figured out how to get it to run, so I can't test it.