[Bug 68485] [HSW] wrpll sharing not implemented (3x HDMI/DVI screens)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68485

--- Comment #15 from Paulo Zanoni <przanoni at gmail.com> ---
Created attachment 88373
  --> https://bugs.freedesktop.org/attachment.cgi?id=88373&action=edit
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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