However, it's clear that the graphics hardware can handle 3 outputs, since it refers to "pipe 0, pipe 1 and pipe 2" in the logs. Xrandr compians "Configure crtc 2 failed". The KDE systemsettings GUI helpfully shows icons for all 3 monitors, but one is always greyed out, and attempting to enable it emits "Failed to set mode: Invalid argument" in Xorg.0.log. All monitors are identical 1600x1200 (NEC LCD2070NX). However, I can only get 2 monitors (any 2, but not all 3) working. The CPU is an Intel 4570S with HD4600 graphics (also supporting 3 heads at the same time). I have a Gigabyte GA-H87N-wifi motherboard, which explicitly supports 3 monitors at the same time from the motherboards' onboard graphics (2x HDMI, 1x DVI).
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