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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [GLK] no signal after switch resolution from 1080p@23.98"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105887#c10">Comment # 10</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [GLK] no signal after switch resolution from 1080p@23.98"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105887">bug 105887</a>
from <span class="vcard"><a class="email" href="mailto:shashank.sharma@intel.com" title="shashank.sharma@intel.com <shashank.sharma@intel.com>"> <span class="fn">shashank.sharma@intel.com</span></a>
</span></b>
<pre>(In reply to Jani Saarinen from <a href="show_bug.cgi?id=105887#c6">comment #6</a>)
<span class="quote">> Shashank, Ville, any commments?</span >
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</pre>
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