<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_REOPENED " title="REOPENED --- - [ivb DP dual link DVI dongle regression] [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up" href="https://bugs.freedesktop.org/show_bug.cgi?id=56834#c39">Comment # 39</a> on <a class="bz_bug_link bz_status_REOPENED " title="REOPENED --- - [ivb DP dual link DVI dongle regression] [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up" href="https://bugs.freedesktop.org/show_bug.cgi?id=56834">bug 56834</a> from <a class="email" href="mailto:giulio.genovese@gmail.com" title="freeseek <giulio.genovese@gmail.com>"> freeseek</a> <pre>I have the same problem with a Lenovo X220 and a BizLink diplay port adapter, as I upgraded to Ubuntu 14.04. I am currently using 3.15.0-031500rc5-generic. As per <a href="show_bug.cgi?id=56834#c36">comment #36</a> I also need to add the correct external monitor display with xrandr. I then use the following command to switch from the laptop screen to the monitor screen: "xrandr --output LVDS1 --off --output VGA1 --off --output HDMI1 --off --output DP1 --mode 2560x1600". Every other time this will fail, and it looks like the laptop tried to switch to DP1 unsuccessfully and then reverted to LVDS1. Occasionally, this will also crash the machine requiring a hard reset. Once the laptop finally succeeds in using DP1, running a program like xrandr or unity-control-center will immediately trigger something and revert the display to LVDS1 (100% reproducibility), possibly crashing the system. Each time the laptop reverts to LVDS1 it triggers a message like the one in <a href="show_bug.cgi?id=56834#c33">Comment #33</a> in dmesg. I will also add that "get-edid" completely fails and shows no useful output. It says something like "Looks like no busses have an EDID. Sorry!" and "The EDID data should not be trusted as the VBE call failed". The same Bizlink adapter works flawlessly on a Mac.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>