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<b><a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED --- - [HSW] no modes bigger than 1080p in the parsed EDID for 4k TV on both HDMI/VGA"
href="https://bugs.freedesktop.org/show_bug.cgi?id=67030#c34">Comment # 34</a>
on <a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED --- - [HSW] no modes bigger than 1080p in the parsed EDID for 4k TV on both HDMI/VGA"
href="https://bugs.freedesktop.org/show_bug.cgi?id=67030">bug 67030</a>
from <span class="vcard"><a class="email" href="mailto:cancan.feng@intel.com" title="cancan,feng <cancan.feng@intel.com>"> <span class="fn">cancan,feng</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=67030#c31">comment #31</a>)
<span class="quote">> Created <span class=""><a href="attachment.cgi?id=83302" name="attach_83302" title="Parse 4k VICs">attachment 83302</a> <a href="attachment.cgi?id=83302&action=edit" title="Parse 4k VICs">[details]</a></span> <a href='page.cgi?id=splinter.html&bug=67030&attachment=83302'>[review]</a> [review]
> Parse 4k VICs
>
> Could you try this kernel patch? it parses the HDMI CEA vendor specific
> block to look for 4k modes.
>
> I noticed that X prunes those modes because their pixel clock is larger than
> the other detailed modes. It'll have to be fixed at some point.
>
> (II) intel(0): Not using mode "3840x2160" (bad mode
> clock/interlace/doublescan)
>
> You can however use libdrm's modeprint to check that the modes are exposed
> by the kernel:
>
> $ ./modeprint i915
> Mode: "3840x2160" 3840x2160 30
> Mode: "3840x2160" 3840x2160 25
> Mode: "3840x2160" 3840x2160 24
>
> I also left printks in this patch:
>
> $ dmesg | grep XXX
> [ 4.901749] [drm:do_hdmi_vsdb_modes], XXX: Found 3 modes in the HDMI vsdb
> [ 4.901751] [drm:do_hdmi_vsdb_modes], XXX: Found VIC 1
> [ 4.901753] [drm:do_hdmi_vsdb_modes], XXX: Found VIC 2
> [ 4.901755] [drm:do_hdmi_vsdb_modes], XXX: Found VIC 3</span >
I tried this patch and I still can't see "3840x2160"..I attached the dmesg with
this patch if this is useful for you.</pre>
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