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HALLE-LUJAH!!! been pulling my hair out all evening and it was just the legacy option roms setting tytyty

I installed Clover in legacy mode so it writes a micro loader to the boot sector, which then loads clover from the efi folder in the 200 meg mac uefi partiton. Then I set the bios to boot from the Mac drive and use the Clover boot picker to load win/linux from other drives as needed.

If the sata controller was in raid mode with two drives and a Windows install then that windows partition was probably spread across both drives... Have you tried booting windows to see if it's still intact? Fwiw, I have a 990 running High Sierra / Mojave and legacy mode is the way to go for...

Supposedly OpenCore works on the 990 with Catalina/Big Sur. Unfortunately the OC forums discourage posting working config files and insist everyone read the crappy/non-existent docs and figure it out for themselves. Sure that's required for generic pc builds, but for known systems like dell...

Has anybody managed to get Catalina going on a 990?

Has anybody managed to get High Sierra working on the T410?

Yeah that's where I figured it'd be. No such setting here.

Where is that "switchable graphics" option? I'm not seeing anything like it in bios A26.

I've got a m4800 with the K2100. Nvidia hardware acceleration works with stock and web drivers but then video output only works on an external monitor. I have to disable nvidia for the 4600 to work on the built in display. Theres no bios option to disable hd4600 video or select which is used...

Sure. Fwiw, I'm on bios A26 but don't have sound working :-\

Yeah that's the same issue I get, except with Nvidia drivers it only outputs to an hdmi monitor. I can screenshare in but without the nvidia drivers it's unusably laggy. System report doesn't show Intel HD 4600 or anything similar so I'm wondering if the Intel drivers are even loading when...

Durnit I'm in the same boat...

Make that four of us. It runs High Sierra fine with Nvidia acceleration, it just can't activate the internal display. Disabling the Nvidia drivers lets the Intel graphics work the built in panel but pretty darn slowly.

Have you tried connecting an hdmi monitor?

I've got the same config. Do you have the 4k screen? Install works with an hdmi monitor connecrted but I'm still stuck with a blank laptop screen. Any idea how to get the laptop screen going? edit: fixed it, sorta going into config.plist and checking nv_disable=1 gives me a laptop screen...

Try multibeast?

https://en.m.wikipedia.org/wiki/Master_boot_record MBR is the first 512 bytes of the disk where Ms DOS and such legacy stuff load from. When you tell the Dell BIOS to boot in legacy mode that's where it transfers control to. Most operating systems leave that first sector alone no matter how...

Sure, a regular EFI install to a GUID partition, but ALSO install clover to the MBR so the bios can boot in legacy mode then hand off to clover.

Thx Downloaderx great info. Installing to SSD took less than an hour and with some googling for the bios whitelist fix I was able to plug in an airport for wifi. *install tip, a ssd in a usb adapter is WAY faster than a thumb drive, really speeds up install ;-) edit: working efi files for...

Hot diggity daffodil! Thx for posting your config, by digging through it I was able to get my 6450 working properly with clover on Sierra. All it really needed was the FBName Cedar or Eulemur. <key>Graphics</key> <dict> <key>FBName</key> <string>Cedar</string>...