https://bugzilla.kernel.org/show_bug.cgi?id=54381
Alex Deucher alexdeucher@gmail.com changed:
What |Removed |Added ---------------------------------------------------------------------------- CC| |alexdeucher@gmail.com
--- Comment #1 from Alex Deucher alexdeucher@gmail.com 2013-02-24 16:27:18 --- This is a hardware limitation. The hardware only has 2 PLLs for non-DisplayPort monitors. As such, the driver only supports 2 independent pixel clocks on non-DisplayPort monitors. If you have more than 2 non-DP monitors, it will only work if several of them share the same pixel clock (i.e., the monitors sharing a PLL have to display the same mode with the same pixel clock). Older kernels did not properly warn about exceeding these limitations.