Ubuntu
linux package

  1. Bug #1165965
  2. Comment #61

Comment 61 for bug 1165965

Revision history for this message
Hans-Peter Schadler (hps-abyle) wrote : Re: External display stopped working

I can also confirm that it works more reliable with 3.12.0-031200rc6-generic (and 3.12.0-031200-generic), but it is still not perfect. I would have to ability to test it on two cases where it does not work. Both are beamers (different models, I have to check which one exactly) and both are connected over very long VGA cables.
This is still an annoying bug, at least there was some progress so that it started to work again for most monitors I tried. Now it would be nice to get it working on beamers too.

Can I do something to test this? I have checked the dmesg messages and there are no messages like
"[drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up"
what happened before kernel 3.12 (and maybe kernel 3.11.4). From xrandr output I noticed, that the DP1 connector is shown as disconnected and also no modes are shown (before kernel 3.12 there was sometimes a resolution of the external monitor detected).