I'm trying to hook up an old PC to my TV. It has an NVIDIA GT128 graphics card. I currently have both VGA and HDMI connections from the PC going to the TV.
When I power up I can see the BIOS messages then the grub loader menu (I'm using Debian 8) on both the VGA and HDMI outputs, but during boot the HDMI output suddenly stops. It's at the same time during the boot process that the screen resolution changes (framebuffer?).
If I start up Xorg, the problem is the same.
HDMI-1 connected 1920x1080 VGA-1 connected 1920x1080
Which I believe would imply that HDMI-1 hasn't been disabled. I've tried
disper to switch to the HDMI output, but I simply end up with no display at all (as it turns off the VGA output).