<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [hsw DP] Ubuntu 12.04 unable to use external monitor through edock" href="https://bugs.freedesktop.org/show_bug.cgi?id=73694#c30">Comment # 30</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [hsw DP] Ubuntu 12.04 unable to use external monitor through edock" href="https://bugs.freedesktop.org/show_bug.cgi?id=73694">bug 73694</a> from <a class="email" href="mailto:noodles@earth.li" title="Jonathan McDowell <noodles@earth.li>"> Jonathan McDowell</a> <pre>Testing with drm-intel-nightly (top of tree is 2ea23cd593ba60ead60e2f796fae675aa4475b1a) on a Dell E7240 (Haswell). Running up to date Debian testing, xserver-xorg-video-intel version 2:2.21.15-2+b2. Boot undocked, everything fine. Plug into dock, attached monitor is not detected (tried both DVI ports on the dock and the VGA port, xrandr shows nothing connected). Boot docked, monitor (attached to DVI port 1) is detected, text KMS console message display on both, once X starts built in laptop screen goes dark. Turns out this is the backlight - if I hit the backlight keyboard keys it shows a normal screen ok. Unplug from dock, X restarts (back to gdm3 login). Plug back into dock, dock attached monitor is not detected. I'm not seeing anything that looks helpful in the dmesg (there's a pipe A underrun error when booting docked) but I'll attach dmesg-no-dock and dmesg-docked. I think it should be clear from when the USB devices change when the laptop is being docked and undocked.</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>