<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [KBL] modeset to a different refresh rate periodically results in a black screen" href="https://bugs.freedesktop.org/show_bug.cgi?id=101373#c15">Comment # 15</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [KBL] modeset to a different refresh rate periodically results in a black screen" href="https://bugs.freedesktop.org/show_bug.cgi?id=101373">bug 101373</a> from <a class="email" href="mailto:joe.yasi@gmail.com" title="Joseph Yasi <joe.yasi@gmail.com>"> Joseph Yasi</a> <pre>Denon suggested a possible signaling issue at first. They suggested trying shorter cables, and using a the HDMI input port closest to the output on the receiver. I was already doing that, and I switched out a 10 ft cable for a 6 ft cable, and used cables rated for HDMI 2.0 bandwidth with no change. I noticed in the dmesg that the driver is setting a 12 bpc mode: [ 310.091302] [drm:intel_hdmi_compute_config [i915]] picking bpc to 12 for HDMI output [ 310.091333] [drm:intel_hdmi_compute_config [i915]] forcing pipe bpc to 36 for HDMI [ 310.091366] [drm:intel_atomic_check [i915]] hw max bpp: 36, pipe bpp: 36, dithering: 0 Denon suggested forcing a 10 bpc mode to see if it helps the issue. I noticed the problem is worse if I set a 3840x2160 @ 30 Hz mode and then toggle back to 1080p @ 60 Hz and 1080p @ 59.94 Hz. I'm only using 8 bpc in the X configuration. Is there a way for me to force 10 or 8 bpc on the physical mode?</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>