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I would like to set my HDMI refresh rate to 100 MhZ as supported by my TV, however using the code below always set it to 60 MhZ:

hdmi_group=1
hdmi_mode=40

Any idea why or suggestions on how to change it?

1

Looking around on this Raspberry Pi forum post, try adding this to your file:

hdmi_ignore_edid=0xa5000080

That will force a mode even if the Pi thinks it is not supported. You should only use this if you are sure your monitor supports the requested mode.

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