[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 #31 from Damien Lespiau <damien.lespiau at gmail.com> ---
Created attachment 83302
  --> https://bugs.freedesktop.org/attachment.cgi?id=83302&action=edit
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

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