[Bug 93885] New: 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

            Bug ID: 93885
           Summary: radeon: allow the user to set a maximum HDMI pixel
                    clock (in MHz) by a kernel parameter
           Product: xorg
           Version: 7.6 (2010.12)
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: estellnb at elstel.org
        QA Contact: xorg-team at lists.x.org

As far as I have seen radeon sets the pixel clock (in MHz) for the HDMI/DVI
output to a value as recommended by the firmware, only. Since kernel 4.5.0 the
nouveau driver has a kernel parameter called hdmimhz to override this setting
by hand: As far as I could test it the results I get that way are just
wonderful (see for Bug 93405).
  The situation with my '4K ready' XFX Radeon R5 230 card is similar than it
was with the nouveau driver before kernel 4.5.0: The promised 3840x2160 at 30 mode
is not offered by default and when I try to set this mode manually the screen
remains black (no signal). It was exactly like this with my Nv. Geforce 9600M
GT until the hdmimhz kernel parameter appeared. Since then it works even better
than officially specified by Nvidia with nouveau (nobody would have believed
that).
  Why isn`t there a similar parameter for radeon?

kernel version: 4.5.0-rc1-ARCH #2 SMP PREEMPT
radeon driver (xf86-video-ati/arch): 1:7.6.1-1

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