<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - [GLK] no signal - with samsung 4k TV - HDMI UHD Color (ENABLED)" href="https://bugs.freedesktop.org/show_bug.cgi?id=110496#c39">Comment # 39</a> on <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - [GLK] no signal - with samsung 4k TV - HDMI UHD Color (ENABLED)" href="https://bugs.freedesktop.org/show_bug.cgi?id=110496">bug 110496</a> from <a class="email" href="mailto:teeedubb@gmail.com" title="teeedubb@gmail.com">teeedubb@gmail.com</a> <pre>(In reply to <a href="mailto:shashank.sharma@intel.com">shashank.sharma@intel.com</a> from <a href="show_bug.cgi?id=110496#c33">comment #33</a>) > > I have a theory that maybe the TV expects 422 rather than RGB for 4K with deep > color. But I have no idea how to force the ycb422 output on Gemini Lake. > > This could be the case, and we don't support YCBCR422 yet. Its Either RGB888 > or YCBCR420 if that's from 420VDB. > > - Shashank How can YCBCR420 be enabled? I can not see anything even resembling that mode in xrandr's verbose output. All I see is "Colorspace: BT2020_CYCC supported: Default, SMPTE_170M_YCC, BT709_YCC, XVYCC_601, XVYCC_709, SYCC_601, opYCC_601, opRGB, BT2020_CYCC, BT2020_RGB, BT2020_YCC, DCI-P3_RGB_D65, DCI-P3_RGB_Theater"</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are on the CC list for the bug.</li> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>