D620 GMA950 - External display corruption at/above 1280x1024, EDP v4-r65 and beyond

[Bronxteck]

wait a second you have a high res model d620? if you do then you cannot use the low res DSDT.aml it causes graphics corruption.

[Hervé]

Well, if that existed, we need to update the bootpack page for the D620 GMA. It only shows one entry, clearly one for the low res model.

[nmotoh]

Yes, the internal display is at 1440x900, please consult attachment. If more hardware information is required also the system profile is attached as plain text. What also puzzles me is the clock frequency of the CPU. Initially after installation of the OSX 10.6.3 it is listed in the "About This Mac" as 1.9(3) GHz. But after installation of the kexts it is noted as being 1.83 GHz. If that matters.

 

Thanks for your help.

 

Edit 1: BTW, the wifi built in is from Intel (PRO/Wireless 3945ABG) and does not work. I have only had success on getting it to work on Windows (XP, Vista) and Linux distributions using commercial code inclusions (as Ubuntu). It does not work on any BSD based distros (FreeBSD or OpenBSD).

 

Edit 2: Can the macbook.txt be removed from the post?

[Bronxteck]

deleted it....

[nmotoh]

deleted it....

Thanks a lot.

 

So, the question is now which dsdt to use...? I will look around for an dsdt editor and report back here.

/N

[Hervé]

Try this one, renamed as DSDT.aml in /Extra.

dsdt_d620_gma_1440x900.aml.zip

[nmotoh]

Thanks for the file. I have now applied it in /Extra/ with the following findings (they are very similar to the previous findings):

 

I have tested the following scanrios:

 

Undocked, (monitor secondary display (extended))

Docked, lid open, (monitor secondary display (extended))

Docked, lid closed, (monitor primary display)

 

Always, when running at 1280x1024 (@ 60 or 75 Hz) the bottom part of the display is garbled (see attachment). It is ok when running at 1280x980, but items on the screen appears to be vertical elongated. Most evident on circles as the iTunes icon.

 

After updating the dsdt.aml I ran a full myFix.

 

/N

[Hervé]

No need to run myFix after changing DSDT file, just a straight reboot obviously to load that new table.

 

The tests I ran the other day were in mirrored mode so I'll try again with extended mode, but no docking station/port replicator I'm afraid.

[nmotoh]

Ok, I just tried in mirrored mode too with and without the dock (I didn't test the DVI port). Dock or no dock gave the same results.

 

The system now reports that it is running in 1280x900 on both screens. On the monitor there's a black bar below (equal to the difference between 1024 and 900, I guess). On the built-in display there're vertical black bars at the sides.

 

Please see attachment.

 

/N

[Hervé]

Ok, good, that's exactly what I experienced the other day. It's totally consistent and the black parts on the external screen are due to the widescreen ratio that is being maintained across both displays. You should still be able to select 1440x900 on the built-in LCD and another resolution on the external display; it'll then adjust with bars accordingly.

Now, coming back to the issue you reported in extended mode, I have good news and bad news. The good news is that I can 100% reproduce the problem with my D620 GMA low res; the bad news is that there is indeed a problem!

I hooked my D620 (GMA950) to a 19" 4:3 1280x1024 external LCD and booted SL 10.6.8. Internal display was @1280x800 as usual and external screen got automatically set by default @1152x864 (75Hz). No problem, external display looking nice enough.



I then started to play with higher resolutions.
1) @1280x768 (60Hz), no problem, but graphics and text are a bit distorted/squeezed horizontally due to resolution. Not nice at all (doesn't show on screencopy).


2) @1280x960 (60Hz), no problem. Graphics and text look very much like @1152x864, there is just a bit more space available on the screen.


3) @1280x1024 (60Hz/75Hz), I too get the graphics corruption at the bottom. The issue is bad enough to even temporarily affect screen contents during moves.


Conclusion: stick to 1152x864 or 1280x960!