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

Priority: medium Bug ID: 75223 Assignee: dri-devel@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@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.