Created attachment 88373
Bug fix

Hi

The attached patch allows you to share the HDMI/DVI clocks when you have
2 monitors using the same exact pixel clock. With this, you can have
your 3-pipe setup working if any 2 monitors are using the same
configuration.

Please notice that you can have 2 modes with the same resolution but not
the same pixel clock, so just looking at the resolution doesn't help
you: you have to run "xrandr --verbose" and then look at the pixel
clock.

On xrandr, the line for a mode will be:
WIDTHxHEIGHT (identifier) pixel_clock hsync_vsync

Example:
1920x1080 (0x46) 148.5MHz +HSync +VSync

To select this precise mode, you have to use the identifier when using
xrandr, so you'll do something like:

xrandr --output HDMI1 --mode 0x46
xrandr --output HDMI2 --mode 0x46
(only if both monitors support the mode with identifier 0x46)

In case you need help, please just attach the output of "xrandr
--verbose" and I'll help you.

Thanks,
Paulo

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https://bugs.launchpad.net/bugs/1215449

Title:
  triple monitor support not working on HD 4600

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https://bugs.launchpad.net/xserver-xorg-video-intel/+bug/1215449/+subscriptions

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