Originally I had this computer connected, via VGA and DVI, to two monitors. It worked fine with those two monitors in the following configurations: VGA/DVI DVI/HDMI HDMI/DVI I could even disable VGA and enable HDMI to get a third monitor working at the expense of the second (42" TV on HDMI). I have moved it and connected it to two monitors - Dell E1910H (VGA only) and a Westinghouse 42" LCD TV (HDMI only). The follow is observed: Boot with both plugged in results in a spew of EDID errors and no TV. HDMI cannot be enabled. VGA works fine. Boot with only TV plugged in and it works fine - EDID is correct. Then plug in the VGA (after booting with HDMI working). Using xrandr activate the VGA: xrandr --output VGA-0 --auto and the VGA comes up but the HDMI disconnects. So I know the HDMI connector, cable, and TV are fine as that works if I boot with only that plugged in. Plugging in the VGA ensures the HDMI doesn't work but the VGA comes up. Strange given the card was able to do that with a different VGA monitor in the past. Something funny with that DELL monitor? Looking for clues. Thanks for your time.
Please attach your xorg log and dmesg output. There were a number of cards in the r6xx days where the HDMI and VGA port shared the same DDC line so you couldn't use the two ports together. I suspect this may be what you are seeing. If this is the case, you'll have to use a DVI to VGA adapter on the DVI port to use the VGA and HDMI monitors together.
Created attachment 46003 [details] dmesg_vgaonly
Created attachment 46004 [details] xorg log vgaonly
Created attachment 46005 [details] dmesg_tvonly
Created attachment 46006 [details] xorg tvonly
Created attachment 46007 [details] dmesg_both
Created attachment 46008 [details] dmesg_both
Created attachment 46009 [details] xorg both
Created attachment 46010 [details] dmesg_hd5450_instead
Created attachment 46011 [details] xorg_hd5450_instead_with_both
Ok, swapping with the 5450 clears up that problem. I'll use that 3450 in the machine from which the 5450 came out of as its monitors have DVI. So the bug with the 3450 remains but the monitors work around it. The 5450 can drive the VGA and HDMI at the same time so I'm good. Thanks for the help.
Ok, so the oem designed your board to use the same ddc line for both vga and hdmi. You can't use both VGA and HDMI at the same time with that board. That's also probably the reason you are getting EDID errors. If you want to use VGA and HDMI, you will need to use a DVI to VGA adapter on the DVI port for the VGA monitor.
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