<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - 24Hz (&23.976Hz) modes broken with recent drivers" href="https://bugs.freedesktop.org/show_bug.cgi?id=87112#c21">Comment # 21</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - 24Hz (&23.976Hz) modes broken with recent drivers" href="https://bugs.freedesktop.org/show_bug.cgi?id=87112">bug 87112</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 several further tests today with the most recent 4.8.4 kernel on Ivy Bridge. The bug appears consistently, and produces no output on HDMI2 whatsoever using any recent kernel versions, even when reverting to a blank xorg.conf (to avoid issues with user-provided modelines) as well as downgrading the xf86-video-intel driver (to 2.21.9-the last "known-good" version for dual-display IVB) According to the debug output, and output from xrandr, the system/drivers do _think_ that the modes have been successfully switched, but again, there is not output for either 60Hz, 50Hz, 24Hz & 23.976Hz on the secondary display. The regular LCD panel is unaffected and -always- produces output. See the provided drm.debug=0xe attachments, for 4.8.4/nonworking and 3.18.5/working - and *please* let me know whether any additional output would be needed as I really want to solve this issue; it has prevented me from upgrading this system for quite some time.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>