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

[nmotoh]

I will stick to 1280x960@75Hz on my monitor. I can live with the not ideal, but not that bad either, proportions. Anyway, I will monitor the forum for any solutions to this - albeit - small problem.

 

Thanks a lot for the investigation and news.

/N

[Hervé]

Out of interest, I've also done the same tests with my 20" widescreen 1680x1050 LCD.

 

-> same sort of results: bottom of screen gets corrupted beyond 1280x800:

1) @1280x1024

 

2) @1680x1050

 

-> looks like any resolution starting from 1280x1024 and above gets corrupted.

[nmotoh]

Yes, I concur.

 

However, what is strange, it appears that during boot up until the login window appears, the screen can be in 1280x1024x32 if specified in the org.chameleon.Boot file (under "Graphics Mode"), independently on the setting (yes/No) of the "GraphicsEnabler" flag...

 

I guess a display driver guy will be able to answer this?

 

/N

[Hervé]

That just applies to built-in LCD or ext. display in mirrored mode. The problem experienced above is only for ext. display in extended mode and that is only available post-boot.

[nmotoh]

Sorry for not making it clear. If you boot when the PC is connected to the dock and the lid of the D620 being closed then having the external monitor attached to the dock's VGA port is causing the external monitor to be the primary and only display, and hence are being used by chameleon. So the monitor is neither running in mirrored nor extended mode. Please consult the attachements:

• The BIOS loads,
• Chameleon about to start the OSX boot loader,
• OSX loading,
• OSX login screen.

On the latter picture please notice the garbled lower part of the screen. I recon that the actual resolution is difficult to read, but changing the values in "Graphics Mode" changes the look.... so some influence it can have...

 

/N

[geyouncherf]

Have the same issue on a D420 with external display. looks like any vertical resolution over a 1000px starts to garble the bottom x% of the screen. it has noting to do with docking/non-docking, internal display on/off, dvi or rgb. 

please let me know how i can help you guys debug (and fix the issue.

[geyouncherf]

Oh and b.t.w. that's still the case in the current EDP version (Version #4 (Rev: 157)) - maybe we need to change the topic heading ?

This used to work fine about a year back, but i don't have a backup from that time to check what graphics driver I used then

[vipjun]

have the same issue, tagging so i get notification when a fix is out. thanks

[CarlitoND]

Sorry for refreshing of old topic but was above issue finally solved? I still have it using latest EDP with my D430 on 22'' 1680x1050 screen.

Maybe I missed a fix but I can't find it.

 

Thank anyone in advance for a hint

Greg

[Hervé]

No, probably requires a DSDT fix that no-one worked on to date.