[Bug 105887] [GLK] no signal after switch resolution from 1080p at 23.98

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105887

--- Comment #10 from shashank.sharma at intel.com <shashank.sharma at intel.com> ---
(In reply to Jani Saarinen from comment #6)
> Shashank, Ville, any commments?

There is something fishy with the EDID's extension blocks for this monitor. 
first probe, EDID says neither 420_only nor 420_also supported:
=============
[    1.278592] [drm:drm_add_display_info] *ERROR* YCBCR420 (also) supported =N
[    1.278596] [drm:drm_add_display_info] *ERROR* YCBCR420 (only) supported =N
[    1.278600] [drm:drm_add_display_info] *ERROR* YCBCR420 dc support =N
[    1.278604] [drm:drm_add_display_info] *ERROR* ========
====================================

second probe says 420_also modes supported but no 420_only mode:
=============
[    1.278673] [drm:drm_add_display_info] *ERROR* YCBCR420 (also) supported =Y
[    1.278678] [drm:drm_add_display_info] *ERROR* YCBCR420 (only) supported =N
[    1.278682] [drm:drm_add_display_info] *ERROR* YCBCR420 dc support =N
[    1.278686] [drm:drm_add_display_info] *ERROR* ========
====================================

and the third probe says both 420_also as well as 420_only supported:
=============
[    1.460456] [drm:drm_add_display_info] *ERROR* YCBCR420 (also) supported =Y
[    1.460564] [drm:drm_add_display_info] *ERROR* YCBCR420 (only) supported =Y
[    1.460566] [drm:drm_add_display_info] *ERROR* YCBCR420 dc support =N
[    1.460567] [drm:drm_add_display_info] *ERROR* ========
====================================

I am not sure how HF-VSDB block is changing every probe, that to in an
incremental supported way :)

- Shashank

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