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Latitude 7280: Help with some issues


Akerbeltz14

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The last OC EFI folder you posted shows that you disabled patches for framebuffer's fbmem and stolenmem; I therefore assume you must have patched DVMT in BIOS through Grubshell. Is that correct and if so, which value did you set DVMT to? 64MB or 96MB?

 

I would also try to disable these other patches:

  • disable-agdc
  • enable-hdmi-dividers-fix

I'm not using such patches on my SKL HD520 Latitude E7270 and obtain 4K @60Hz out of DP + HDMI with DVMT 96MB BIOS patch alone (I only use igfxonln=1 boot-arg to avoid built-in LCD staying off when connecting HDMI).

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See at bottom of post #1:

https://osxlatitude.com/forums/topic/15648-dell-latitude-e7270-with-i7-6600u-hd520-and-1920x1080-touchscreen-high-sierramojavecatalinabig-surmonterey

 

If you have, say, a Clover bootable USB key, simply copy the ModGRUBShell.efi module to EFI/CLOVER/drivers/UEFI folder.

 

I would expect you to find DVMT set to 64MB and require to set it to 96MB for 4K @60Hz.

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After double checking my Skylake/HD520 Latitude E7270, with DVMT patched to 64MB or 96MB through GrubShell, I'm getting 4K @30Hz max. HDMI and 4K @60Hz DP:

 

HDMI_4K_DVMT_64MB.jpg     mDP_4K_DVMT_64MB.jpg

 

It's in full compliance with Intel's posted specifications.

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