<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - Brytrail-I E3845 DisplayPort blank screen on boot" href="https://bugs.freedesktop.org/show_bug.cgi?id=100698#c3">Comment # 3</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - Brytrail-I E3845 DisplayPort blank screen on boot" href="https://bugs.freedesktop.org/show_bug.cgi?id=100698">bug 100698</a> from <a class="email" href="mailto:shadow.yang@advantech.com.tw" title="shadow <shadow.yang@advantech.com.tw>"> shadow</a> <pre>(In reply to Jani Nikula from <a href="show_bug.cgi?id=100698#c2">comment #2</a>) > Please try a recent kernel, at least v4.10, perhaps v4.11-rc7 or drm-tip > branch of <a href="https://cgit.freedesktop.org/drm/drm-tip">https://cgit.freedesktop.org/drm/drm-tip</a> I tested kernel v4.11-rc7 and drm-tip-2017-04-13, but still get fail while boot with legacy VBIOS. If change BIOS CSM=>video from legacy to UEFI, the DP monitor will not get blank for UBuntu server 16.04, but kernel shows eDP instead of DP. For legacy setting, we change different resolution and monitor will get the same resolution. For UEFI setting, if we set video=eDP-1:1280x1024 on grub, the OSD of Dell 4k monitor will show 1600x1200 and we have to open MST or we always get blank for 4K monitor without MST. <a href="http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.11-rc7/">http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.11-rc7/</a> <a href="http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-tip/2017-04-13/">http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-tip/2017-04-13/</a></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 assignee for the bug.</li> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>