HD4000 Graphics Scrambled at 720p

HD4000 Graphics Scrambled at 720p [SOLVED]

Hi All

My Mac is set up across the room from me about 3 feet away on a 40" HDTV. So I need to reduce the resolution so I can read things better.

I have 1080p working great but when I change to 720p in settings, I get a scrambled screen.

I've tried:

The latest Chimera - 2.1

EFI injections from http://www.tonymacx86.com/mountain-...ad-fyi-only-guide-10-8-how-enable-hd4000.html (I also changed the Memory size to match)

I followed this guide: http://www.tonymacx86.com/graphics/83783-intel-hd-4000-troubleshooting-tips.html

And this guide: http://www.tonymacx86.com/graphics/...ary-display-hd4000-secondary-display-how.html

And this guide: http://www.tonymacx86.com/99-quick-guide-configuring-uefi-gigabyte-s-7-series-lga-1155-boards.html

I'm doing as much reading as I can, but what I've found so far that the GA-B75-D3P board seems to be unsuccessful.

Setup:
GA-B75-D3P
Intel i3 3225
8GB Corsair RAM
Sandisk Extreme 120GB SSD

Any ideas? Ask away. I will answer every question!

What about the idea of a DSDT edit?

colinzeal said:

What about the idea of a DSDT edit?

Click to expand...

Colin,

I hadn't realised that you were connecting to a 1080P screen. Everything is working as it should. The TV and computer are talking to each other and confirming that 1080P resolution is compatible between them. This is all done digitally between the two devices and you are not given any other resolution options in system preferences. The TV also does not have the ability to change the resolution of a digital signal - its all automatic.

The only option that I see open to you is to check to see if your TV has a VGA socket. If it does then you can try an active HDMI to VGA convertor. This would take the analogue HDMI signal , convert it into an analogue VGA signal and and down convert the resolution to 1024 x 768. This is the resolution that the TV would then display the full image.

If your TV supports VGA, then you would also require the following;

1 x VGA cable (select VGA input on TV)
1 x 3.5mm to 3.5mm stereo plug to plug cable (connect between green audio out on rear I/O panel to VGA audio in on TV) system preferences/sound/output/internal speakers

http://www.amazon.co.uk/dp/B007KEIRNG/?tag=tonymacx86-21
http://www.amazon.co.uk/gp/product/B007SM7O2U/?tag=tonymacx86-21

Either of these will work as long as the HDMI output from your motherboard supplies 5V/500mA power- shouldn't be an issue. In an ideal world I would prefer to use an external power supply with an adaptor, but these are likely to cost significantly more and after a quick look I am not even able to find one.


Feedback?


Adrian B

But I do get the option for different resolutions in settings. I can see 1080p great. It's when I switch that I get the garbled screen.

On my first build I used to have a GT610 for graphics. I set that to 720p and used the same tv.

I'll take photos etc when I get home.

Thanks for your input though Adrian.

On the System Preferences Display preference pane, try moving the underscan slider a tiny bit to the right. I've seen this on some 1080p screens, that OS X detects the monitor as a TV and garbles in 720p mode. It can be fixed. Check this screenshot:

God save TonyMac.

It worked Tony. I don't know how you do it but you're a genius!

Lots of Love from London.

colinzeal said:

God save TonyMac.

It worked Tony. I don't know how you do it but you're a genius!

Lots of Love from London.

Click to expand...

Brilliant, thats good to know



Adrian B

tonymacx86 On the System Preferences Display preference pane, try moving the underscan slider a tiny bit to the right. I've seen this on some 1080p screens, that OS X detects the monitor as a TV and garbles in 720p mode. It can be fixed.

How do I get to the underscan slider when my display is scrambled? Sorry, I'm a newb.