| Summary: | 3840x2160 HDMI 30Hz fails on XFX r7-240a-clh4 and r7-250a-lzh4 | ||||||||
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| Product: | DRI | Reporter: | Adam J. Richter <adam_richter2004> | ||||||
| Component: | DRM/Radeon | Assignee: | Default DRI bug account <dri-devel> | ||||||
| Status: | RESOLVED FIXED | QA Contact: | |||||||
| Severity: | normal | ||||||||
| Priority: | medium | ||||||||
| Version: | XOrg git | ||||||||
| Hardware: | x86 (IA32) | ||||||||
| OS: | Linux (All) | ||||||||
| Whiteboard: | |||||||||
| i915 platform: | i915 features: | ||||||||
| Attachments: |
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Created attachment 95261 [details] [review] possible fix Does the attached patch help? I confirm that applying your patch to linux-3.13.0 resulted in both XFX Radeon video cards working (r7-240a-clh4 and r7-250a-zlh4). Thank you, Alex! Great work! Just to clarify, I confirm that that patch made both video cards successfully output 3840x2160 over HDMI to a Seiki se39uy04 television. Great. Patch is sent upstream and should show up in the stable series as well soon. |
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Created attachment 94377 [details] 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.