[Bug 91900] Unable to correctly set 3 monitor outputs with different resolution/clock on newer kernel/intel driver

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91900

--- Comment #5 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
The dmesgs don't seem to match your supposed xrandr calls very well. Looking at
intel-dmesg-4.0-3-vgaonly, I see it doing the following

1. enables pipe A -> HDMI-A-1, picks DPLL A, clock is 106500kHz
2. enables pipe B -> HDMI-A-2, picks DPLL B, clock is 108000kHz
3. tries to enable pipe C -> VGA-1, fails to find a DPLL even though the clock
is the same 108000kHz that DPLL B is already producing

I don't see what could be different between DPLL settings between pipe B an C,
both use the same PLL limits, and there should be no SSC/etc. things to worry
about. Unfortunately the driver is being extremely unhelpful and doesn't print
out any of the DPLL settings it's trying to match so I can't see what the
actual difference is.

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