Hmm, something is very wrong with my 5870.
Recently the HDMI cable I use to connect it to my 50 inch Samsung Plasma went bad and I replaced it today.
Now, when I set the resolution to 1080p, the computer thinks everything is okay, but the TV says there is no signal. I tried routing it through my receiver, and again the computer thinks everything is okay but nothing is showing up on the screen. The receiver has a little red light for video signal coming in, and that flashes on and off a few times before staying off.
What is interesting is when I set the resolution to 720p it shows up okay on the TV (directly into the TV or via the receiver, both work.) In addition, 1080p24 and 1080i also work. But no other common resolutions work - like 1280x1024, 800x600, etc.
I uninstalled the drivers (I was on 12.4), reinstalled, didn't fix anything. Then I uninstalled and ran driversweeper. Interestingly, with no display adapter drivers installed, the TV received 800x600 as well as 1280x1024 signals (I couldn't test 1080p without a driver.) But both of these are resolutions that don't work when the drivers are installed. I then installed 12.2 and it has the same problems.
Edit: When installing both 12.4 and 12.2 after installation it said some warnings had come up. This has never happened before. It links to a log for the install and I went to it and I couldn't find any warnings either time.
The obvious suggestion is something is wrong with the new cable, but the fact that 800x600 and 1280x1024 work without drivers but don't work with drivers make me think it's not a cable problem.
Edit 2: To double check the cord I plugged it into my secondary monitor, an IPS236 which is an LCD monitor, not a plasma HDTV, but on there I get 1080p just fine. So there's something wrong with how the driver and my TV are communicating and I don't know how to fix it.
Recently the HDMI cable I use to connect it to my 50 inch Samsung Plasma went bad and I replaced it today.
Now, when I set the resolution to 1080p, the computer thinks everything is okay, but the TV says there is no signal. I tried routing it through my receiver, and again the computer thinks everything is okay but nothing is showing up on the screen. The receiver has a little red light for video signal coming in, and that flashes on and off a few times before staying off.
What is interesting is when I set the resolution to 720p it shows up okay on the TV (directly into the TV or via the receiver, both work.) In addition, 1080p24 and 1080i also work. But no other common resolutions work - like 1280x1024, 800x600, etc.
I uninstalled the drivers (I was on 12.4), reinstalled, didn't fix anything. Then I uninstalled and ran driversweeper. Interestingly, with no display adapter drivers installed, the TV received 800x600 as well as 1280x1024 signals (I couldn't test 1080p without a driver.) But both of these are resolutions that don't work when the drivers are installed. I then installed 12.2 and it has the same problems.
Edit: When installing both 12.4 and 12.2 after installation it said some warnings had come up. This has never happened before. It links to a log for the install and I went to it and I couldn't find any warnings either time.
The obvious suggestion is something is wrong with the new cable, but the fact that 800x600 and 1280x1024 work without drivers but don't work with drivers make me think it's not a cable problem.
Edit 2: To double check the cord I plugged it into my secondary monitor, an IPS236 which is an LCD monitor, not a plasma HDTV, but on there I get 1080p just fine. So there's something wrong with how the driver and my TV are communicating and I don't know how to fix it.