Ubuntu: Black Screen when start Ubuntu before the TV


when i start my ubuntu-based htpc before i turn on my tv the screen is black. i could fix that problem on ubuntu 14.04 (kernel 3.16) with this http://forum.kodi.tv/showthread.php?tid=174854&pid=1824527#pid1824527 howto. but now with 16.04 (and also with 14.04 with a kernel higher than 3.16) this doesn't work. when i try it after turn on the tv i see the error "invalid format". i tried also a dvi cable and changed the primary graphic in efi, but it doesn't work.

BUT IT WORKS WITH MY VERY OLD AND VERY BAD TV FROM BEDROOM. only my big 4k-lg has problems. i did a factory reset, but no success.

so what can i do? any other solution for that problem?

my hardware: mainboard: asrock am1h itx cpu: sempron 3850 tv: lg uf 8509

Note:If u also have question or solution just comment us below or mail us on toontricks1994@gmail.com
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