Comment 106 for bug 745112

I can confirm heavy problems with oneiric. My Laptop (Lenovo X201s on a docking station) is connected via display port to a 19" Dell screen. This screen stays black when I activate it via gnome or fn+f7. Sometimes (i.e. not reproducible) the screen gets a signal after multiple rounds of pressing fn+f7 (~20 times).
Rebooting the laptop with the monitor switched off an switching on when I am logged in again does not help at all.

In dmesg the following logs appear:
[ 150.471512] [drm] Changing LVDS panel from (-hsync, -vsync) to (-hsync, +vsync)
[ 151.315930] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting
[ 152.325743] [drm] Changing LVDS panel from (-hsync, +vsync) to (-hsync, -vsync)
[ 153.441943] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting
[ 155.196290] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting
[ 171.041755] [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up

I will provide further information as needed.