<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - [IVB/HSW] 23.976Hz & 24Hz modes broken on dual-display with recent (4.0.x) kernels" href="https://bugs.freedesktop.org/show_bug.cgi?id=91434#c32">Comment # 32</a> on <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - [IVB/HSW] 23.976Hz & 24Hz modes broken on dual-display with recent (4.0.x) kernels" href="https://bugs.freedesktop.org/show_bug.cgi?id=91434">bug 91434</a> from <a class="email" href="mailto:martin.x.andersen@gmail.com" title="Martin Andersen <martin.x.andersen@gmail.com>"> Martin Andersen</a> <pre>Did some further testing today (wondering why I still bother as this has now been broken for two whole years), and Intel apparently has utter disregard for its customers. Tested with the latest kernel from drm-tip, 4.12.0-994_4.12.0-994. 50 & 60Hz modes only work intermittently, and with an erratic picture and white dots showing. Reverting to either the 24.000Hz or 23.976Hz modes produces a stable picture. The issue with intermittent output is also present during boot/KMS, indicating it is probably not an Xorg issue. Modes tested after boot: 988 18-Jun-2017 15:10:34 xrandr -q 990 18-Jun-2017 15:11:05 xrandr --output HDMI2 --mode 1920x1080 --rate 23.976 991 18-Jun-2017 15:11:21 xrandr -q 993 18-Jun-2017 15:11:33 xrandr --output HDMI2 --mode 1920x1080 --rate 60 994 18-Jun-2017 15:11:57 xrandr --output HDMI2 --mode 1920x1080 --rate 50 995 18-Jun-2017 15:12:20 xrandr --output HDMI2 --mode 1920x1080 --rate 24 996 18-Jun-2017 15:12:56 xrandr --output HDMI2 --mode 1920x1080 --rate 60 997 18-Jun-2017 15:13:30 xrandr --output HDMI2 --mode 1920x1080 --rate 50 998 18-Jun-2017 15:14:02 xrandr --output HDMI2 --mode 1920x1080 --rate 23.976 999 18-Jun-2017 15:14:15 xrandr --output HDMI2 --mode 1920x1080 --rate 50 1000 18-Jun-2017 15:14:35 xrandr --output HDMI2 --mode 1920x1080 --rate 60 Kernel debug output with drm.debug=0xe is included as per usual. Maybe it is of usage to /dev/null</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> <li>You are the assignee for the bug.</li> </ul> </body> </html>