BillDH2k Posted March 6, 2023 Share Posted March 6, 2023 You don't need legacy boot option. Just add modGRUBShell.efi (in the download link) as an EUFI tool to OC\Tools\ folder, then add it to config.plist: misc->Tools. At the OC picker screen, hit-space bar to show all Auxiliary tools (if they didn't show up), select modGRUBShell.efi to launch it. Enter the commands (my post above) to modify the settings. Recommend #1, and #2 (64MB should be OK, as Herve pointed). #3 may be optional. Once done, reboot. WARNING: Make sure you enter the exact commands above!!! If you modified the wrong cells, it could brick the BIOS! Update: With DVMT Pre-Allocate set to 64MB, you can remove the following keys from the Device Properties for iGPU (no patching of the VRAM is necessary): framebuffer-stolenmem framebuffer-fbmem Link to comment Share on other sites More sharing options...
Administrators Hervé Posted March 6, 2023 Administrators Share Posted March 6, 2023 I don't recall needing to set or select Legacy Boot option to boot the GrubShell USB key on my Latitude E7270 but if @BillDH2k managed to do it on his Latitude 7400, I can't see why you couldn't... Link to comment Share on other sites More sharing options...
Jazzoo Posted March 6, 2023 Share Posted March 6, 2023 @Hervé you are absolutelly right. May be my memory misleaded me with Legacy Boot when setting up the DVMT on other hack long time ago. Soo the problem with the grubshell was something messed up with the plist. I redo everything manually and finally was able to set the right parameters. 4K@30Hz is working without any problems now. Thank you so much @Hervé and @BillDH2k! I added some properties in DP to fix the finnicky HDMI hot/cold plug and now it's working well for both. Here's a screenshot of my DP with the properties I found to be the best for the moment. 1 Link to comment Share on other sites More sharing options...
BillDH2k Posted March 10, 2023 Share Posted March 10, 2023 @Baio77 I've tried your TB3 patch on my 5400 which happens to have the Thunderbolt option, and it worked perfectly. During the testing, I've found that my TB3 device (Dell TB16 docker) has a flaky connection, likely due to the wear of the connector pins, which made intermittent contact and causing similar problem I've encountered with the 7400. If a good connection is made, the 5400 worked perfectly on the TB3 port, either cold or hot plug. So I believe the 7400 would be working fine if I had a good cable. 2 Link to comment Share on other sites More sharing options...
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