[Bug 93885] radeon: allow the user to set a maximum HDMI pixel clock (in MHz) by a kernel parameter

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93885

--- Comment #9 from Alex Deucher <alexdeucher at gmail.com> ---
(In reply to Elmar Stellnberger from comment #7)
>   Likewise for the G96M [GeForce 9600M GT] nobody would have believe that
> this card can yield 3840x2160, be it with 23Hz or 46Hz interlaced. Gonna
> provide the logs tomorrow when the computer with the XFX radeon card is free
> for testing. Just wanna tell that I still hope for a similar radeon tuning
> parameter like hdmimhz. 

That hw was not designed to support 4k over hdmi.  If you want to hack the
driver, you are welcome to (take a look at radeon_dvi_mode_valid()), but it's
not something I want to enable or support out of the box.  If you break your
card or monitor, you get to keep the pieces.

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