ok, you are right. there is a new bios version. $ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date A11 05/29/2012
After upgrade: $ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date A12 09/07/2012 I updated and booted the live image, it is the same as before. The screen is recognized after the second hdmi cable plugin try. using xrandr --auto activates VGA-1, after I saw this http://www0.xup.in/exec/ximg.php?fid=13581600 I deactivated VGA-1 with "xrandr --output VGA-1 --off", the most artefacts are gone. But it is still slow on dual screen and I can not change to the notebook screen (is is frozen) or the screen is cloned. xrandr Screen 0: minimum 320 x 200, current 4310 x 1080, maximum 32767 x 32767 LVDS1 connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 344mm x 194mm 1366x768 60.1*+ 1360x768 59.8 60.0 1024x768 60.0 800x600 60.3 56.2 640x480 59.9 VGA2 disconnected (normal left inverted right x axis y axis) HDMI2 disconnected (normal left inverted right x axis y axis) DP1 disconnected (normal left inverted right x axis y axis) VGA-1 connected 1024x768+1366+0 (normal left inverted right x axis y axis) 0mm x 0mm 1024x768 60.0* 800x600 60.3 56.2 848x480 60.0 640x480 59.9 HDMI-1 connected 1920x1080+2390+0 (normal left inverted right x axis y axis) 477mm x 269mm 1920x1080 59.9*+ 60.0 1680x1050 59.9 1280x1024 75.0 60.0 1280x960 75.0 1152x864 75.0 1280x720 75.0 1024x768 75.1 60.0 800x600 75.0 60.3 640x480 75.0 60.0 720x400 70.1 1024x768 (0x44) 65.0MHz h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.4KHz v: height 768 start 771 end 777 total 806 clock 60.0Hz 800x600 (0x45) 40.0MHz h: width 800 start 840 end 968 total 1056 skew 0 clock 37.9KHz v: height 600 start 601 end 605 total 628 clock 60.3Hz 800x600 (0x46) 36.0MHz h: width 800 start 824 end 896 total 1024 skew 0 clock 35.2KHz v: height 600 start 601 end 603 total 625 clock 56.2Hz -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1040053 Title: [Dell XPS 15 L502X] no HDMI support with dual grafic card in Ubuntu 12.04LTS with 3.2.0-29-generic To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1040053/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
