https://bugs.freedesktop.org/show_bug.cgi?id=93885
--- Comment #17 from Alex Deucher <alexdeuc...@gmail.com> ---
(In reply to Elmar Stellnberger from comment #16)
> I have now had a look at the manual of my XFX Radeon R5 230 Core 2GB
> graphics card. It is clearly marketed as 4K ready there though the card only
> has a DVI, a HDMI and a VGA port. Any claim that 4K would only be possible
> over a non existant display port thus needs to be clearly stated as wrong.
As Roland mentioned, you could run 4k over dual link DVI.
> Once again I wanna ask if anyone here would be ready to help me with a
> patch for the driver; or if anyone here could attempt such a patch including
> a radeon.hdmimhz parameter without me? Why should it not work? It has proven
> in practice for the nouveau driver.
As I said before, the hw was not designed to support it. You'll need to hack
radeon_dvi_mode_valid() to return MODE_OK and radeon_dig_monitor_is_duallink()
to return false.
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