ATI HD5870, issues when changing resolution

[Cero9]

Hello, i've got an Alienware M17x R2 with a ATI HD5870.

It seems to work well, the main issue is that, when it changes resolution or when it stops (and resume) the monitor, it stops working. I see a full black screen that turns to red, green etc.

I have no idea on how to solve this, because everything else seems to work well (it's hardware accellerated, windows and animations are smooth).

 

Do you have any idea? Or anything i can provide to understand what happens when i change resolution or i stop the monitor?

[joe_black]

Does this happen using just HDMI, DVI, VGA, other, or tried everything?

[CaptSilver]

Just the LVDS for me. I did a google search and did not see this topic and reposted about it. VGA and HDMI are working but the LVDS goes wonky even with EDID overrides.

 

http://www.insanelymac.com/forum/topic/290878-asus-g73-with-5870m-resolution-troubles/

[CaptSilver]

Finally fixed it! You need a dual link fix for your dsdt. Just google that as I cannot put the link as it goes to "the site that shall be named" and I will not post someone else's work without attribution.

[Cero9]

Hello, thanks for replying and giving me some hope

I found a thread about the Alienware M17x R3 and there's a code for the dual link fix, but i can't manage to really fix my issue; i extracted my DSDT, then it has lots of errors when compiling and used DSDTFixer to make it compilable (bad idea probably).

Then i added this code and the DTGP one, put the DSDT.aml file in /Extra and rebooted, but still same issue.

I'm quite new to DSDTs (didn't have any before extracting it right now).

 

Just to be sure, that's the issue i'm having: 

http://www.youtube.com/watch?v=3TaTy4p_HGQ

Do you  (did you) have the same?

In the video i open a game because it changes resolution when it starts, when i change it from Settings it's the same (but i'm scared it'll save settings with wrong resolution)