I can confirm this problem for Ubuntu 14.10 with a radeon card. It might also be the problem in Lubuntu: http://forum.ubuntuusers.de/topic/nach-xorg-update-bildschirm-an-hdmi-fuehrt-zu-/ and https://bugs.launchpad.net/mythbuntu/+bug/1402605
I can confirm this problem for Ubuntu 14.10 with a radeon card. It might also be the problem in Lubuntu: forum.ubuntuuse rs.de/topic/ nach-xorg- update- bildschirm- an-hdmi- fuehrt- zu-/ /bugs.launchpad .net/mythbuntu/ +bug/1402605
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