https://bugs.freedesktop.org/show_bug.cgi?id=86320

--- Comment #12 from Wolfgang Rupprecht wolfgang.rupprecht@gmail.com --- Sitting in the initial bios screen and turning off the monitor with either the front soft power switch or the back/top real power switch does indeed cause it to go and stay into power-save mode with a slow blinking of the front blue led. My motherboard has the same problem you observe. (Asus F2A85-M Pro, bios 6601 (the latest))

One thing that I should mention is that under X the monitor will sometimes wake up with a "not optimal mode, 2560 x 1440" small moving box displayed on the screen. This happens some of the time when I turn the monitor off/on or switch displays vea alt-ctl-f3 and then back again. It may be because the two 2560x1440 monitors prefer a slightly different refresh rate. Xrandr seems to think the monitors want 59.xx hz instead of 60.