<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - blank screen at 4k@60Hz DP 1.2" href="https://bugs.freedesktop.org/show_bug.cgi?id=93980#c4">Comment # 4</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - blank screen at 4k@60Hz DP 1.2" href="https://bugs.freedesktop.org/show_bug.cgi?id=93980">bug 93980</a> from <a class="email" href="mailto:ville.syrjala@linux.intel.com" title="Ville Syrjala <ville.syrjala@linux.intel.com>"> Ville Syrjala</a> <pre>(In reply to Alin M Elena from <a href="show_bug.cgi?id=93980#c3">comment #3</a>) > Created <a href="attachment.cgi?id=121489" name="attach_121489" title="log when live changing from dp1.1 to 1.2 and from 30Hz to60Hz">attachment 121489</a> <a href="attachment.cgi?id=121489&action=edit" title="log when live changing from dp1.1 to 1.2 and from 30Hz to60Hz">[details]</a> > log when live changing from dp1.1 to 1.2 and from 30Hz to60Hz Your log starts 60 seconds after boot which means it lacks all the interesting bits from when the driver was loaded. You may need to increase the kernel log_buf_len= knob to catch it all. Anyways, there's an underrun after the modeset, and the clock is rather high, so I suspect this is due to cdclk being set too low. This can also be confirmed by: cat /sys/kernel/debug/dri/0/i915_frequency_info</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>