[Bug 67030] [HSW] no modes bigger than 1080p in the parsed EDID for 4k TV on both HDMI/VGA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67030

--- Comment #34 from cancan,feng <cancan.feng at intel.com> ---
(In reply to comment #31)
> Created attachment 83302 [details] [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

I tried this patch and I still can't see "3840x2160"..I attached the dmesg with
this patch if this is useful for you.

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