Budroid Posted January 8, 2015 Share Posted January 8, 2015 Hi, I have a Dell E6420 with the following specs: 1600x900 screen NVidia NVS4200 (with Optimus) Intel Core i7-2760QM 16GB RAM SSD I've gotten 10.10.1 to install if I have Optimus enabled by using the guide at https://osxlatitude.com/index.php?/topic/7478-dell-latitude-yosemite-install-guide/&do=findComment&comment=45222 But, I cannot get 10.10.1 installer to boot up if I disable Optimus. When I had Optimus enabled, I used DSDT-off_2ch.aml renamed to DSDT.aml and it worked fine. I disabled Optimus and tried to use DSDT-NVS.aml with everything the same but still cannot get the installer to fully boot. I used the -v and -f flags and it just eventually boots to a black screen. I would appreciate any help or advice. Thanks. Link to comment Share on other sites More sharing options...
Administrators Hervé Posted January 9, 2015 Administrators Share Posted January 9, 2015 With -x flag (safe mode), you'll probably be able to boot to desktop, without graphics support of course; but that can then be worked on... Link to comment Share on other sites More sharing options...
Budroid Posted January 12, 2015 Author Share Posted January 12, 2015 So, I had time this evening to try both the DSDT posted above and the -x flag and my laptop still boots to a black screen. I have tried to boot both in the docking station with the lid open and out of the docking station and still get the black screen. My BIOS version is at A21. Do I need to downgrade it maybe? Or something else I can try? Thank you both for assisting me. Link to comment Share on other sites More sharing options...
Moderators Jake Lo Posted January 13, 2015 Moderators Share Posted January 13, 2015 Plug in to an HDMI monitor, see if you get a video output there. No issue with the above DSDT on my E6520 with nvs4200m. Latest Bios A19. I don't have an E6420 with NVS to test the Bios version at the moment. Link to comment Share on other sites More sharing options...
Budroid Posted January 14, 2015 Author Share Posted January 14, 2015 HDMI worked! I was able to complete the install using it but cannot get the laptop display to work at all. Tried booting safe mode but still didn't work. I have not downgraded the BIOS. Should I try the A19 BIOS or something else? Link to comment Share on other sites More sharing options...
Moderators Jake Lo Posted January 14, 2015 Moderators Share Posted January 14, 2015 Strange, that DSDT works for me. What you could try is boot with the HDMI video. Then in display preference, select 'Detect Displays' by holding down the Windows Key, the option will appear. You internal LCD should come up then. See if the LCD is set as the default, if not, then set it. I can't guarantee the LCD will come up on a reboot without the HDMI display. I'll need to go back and check to see what changed. The original DSDT was working perfectly before for NVS, just have to figure out why it's no longer working without changing anything. I'll keep everyone posted. By the way, did you make sure that 'Skip Nvidia GFX' is not check in org.chameleon.boot.plist? Link to comment Share on other sites More sharing options...
VNMan Posted January 14, 2015 Share Posted January 14, 2015 My E6420 has almost the same as the O.P. e6420 except mine has core i5. I will try the DSDT you posted and report back. Thanks Link to comment Share on other sites More sharing options...
Budroid Posted January 15, 2015 Author Share Posted January 15, 2015 I do not have the "Skip Nvidia GFX" in the org.chameleon.boot.plist. I was able to do the detect displays with the Windows key and get the laptop LCD to work. I didn't see a way to set it as default but my bottom bar is on the laptop screen. The, I shutdown and disconnected the HDMI and booted back up to a black screen. When I connected the HDMI again and logged in, I was again able to activate the laptop display. Then, I went through the org.chameleon.boot.plist and found an entry called GraphicsEnabler that was set to Yes. I changed it to No and rebooted without HDMI and the laptop screen worked. I don't know what that entry is for but at least it is working for now. Please let me know if you want me to try anything else. Link to comment Share on other sites More sharing options...
Moderators Jake Lo Posted January 16, 2015 Moderators Share Posted January 16, 2015 Update! Found a workaround to fix the internal display for NVS4200M (Optimus Disabled) See here. Link to comment Share on other sites More sharing options...
Budroid Posted January 16, 2015 Author Share Posted January 16, 2015 Jake, you the man. That new file is working with my laptop display just fine now. Also, I have a docking station with DisplayPort, VGA, and DVI ports. The VGA port and laptop screen work together for dual monitors but the laptop will not detect the monitor on the DVI port. I'm going to try to use the DisplayPort with an adapter as I don't have a DisplayPort monitor. I'll also try the HDMI port on the laptop when I get home. I'll post my results when I get a chance to test it all. Is there anything else you'd like me to test? Link to comment Share on other sites More sharing options...
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