Comment 1 for bug 559601

Similar experience here. Upgrading from 9.10 to 10.04 means that none of my myth front-ends will work because just after boot, VGA and TV-out both go blank - message on the VGA monitor says "input not supported". Confirmed that none of the BIOS settings I've tried have yielded any success.

Willing to try anything - DVR network is completely useless as-is, so it's not like I'm losing anything by testing stuff :)