<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <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#c51">Comment # 51</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 <a class="email" href="mailto:d.scheller.oss@gmail.com" title="Daniel Scheller <d.scheller.oss@gmail.com>"> Daniel Scheller</a> <pre>(In reply to Clinton Taylor from <a href="show_bug.cgi?id=105887#c49">comment #49</a>) > Issue does not occur if I disable 12 bpc support in the driver. > > For a quick test: > > In intel_hdmi.c mothod hdmi_12bpc_possible() > > add > return false; Using an ASRock J5005-ITX on stock Ubuntu 18.04 w/Kernel 4.15, connected to an Onkyo TX-NR509 AV receiver, which shows similar sympthoms (ie. if the resolution goes up (pixel clock rate increases) from the boot res to 1080p50 or 1080p60, the TV picture goes away/blue and the receiver says "No signal". The receiver must be power-cycled to get a picture again). Tried the above (modified Ubuntu kernel sources accordingly, repackaged, installed and booted) - makes the issue go away with this workaround, switching from 50p/60p to 24p and back works, no "No signal". Everything else video-related remains working normally.</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>