[Bug 75223] New: 3840x2160 HDMI 30Hz fails on XFX r7-240a-clh4 and r7-250a-lzh4

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75223

          Priority: medium
            Bug ID: 75223
          Assignee: dri-devel at lists.freedesktop.org
           Summary: 3840x2160 HDMI 30Hz fails on XFX r7-240a-clh4 and
                    r7-250a-lzh4
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: adam_richter2004 at yahoo.com
          Hardware: x86 (IA32)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Radeon
           Product: DRI

Created attachment 94377
  --> https://bugs.freedesktop.org/attachment.cgi?id=94377&action=edit
tar file containing /var/log/Xorg.0.log and logs of dmesg, xrandr, xrandr
--verbose for both cards (r7-240 and r7-250)

The XFX Radeon r7-240a-clh4 and XFX Radeon r7-250a-zlh4 video cards do not seem
to be able to generate 3840x2160 @ 30 Hz video modes over HDMI, even though I
believe their hardware is supposed to be capable of this (~299 MHz pixel
clock).

At least with my se39uy04 39" Seiki television, the Radeon X.org driver happily
passed through the five 3840x2160 @ 24-30 Hz that the television's advertises
in its EDID modes to xrandr, meaning that driver thinks it can support those
video modes, but, if I select any of them, the telvision just says "mode not
support."  In comparison, if I make a custom video mode for 3840x2160 @ 15Hz,
the 4k TV displays that fine.

I am attaching a .tar.gz file containting /var/log/Xorg.0.log and logs of
dmesg, xrandr, xrandr --verbose for both cards (r7-240 and r7-250).

Thanks to Alex Deucher for advising me to file this bug report here.

Thanks in advance for any further processing of this bug report.

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