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PaulFXH 04-14-2010 06:26 PM

How to get Grub2 to boot OS X with Graphics Mode boot option
I've set up a triple boot system (Ubuntu Karmic, Windows Vista and OSX86 -- a patched OS X which works on a PC) on a Dell 9200 (C2D 2.13 GHz, 4GB RAM, nVidia G210).
I sue Grub2 as the bootloader and update-grub picks up OS X and it boots without any problem.
However, although when booting OS X using its own Darwin bootloader, I can apply the boot option "Graphics Mode"="1680x1050x32" to ensure that I get the screen resolution that I want, when OS X boots from Grub2, the only resolution available is 1024x768 which is disappointing.
I have tried adding gfxmode=1650x1050x32 to the OS X section of /boot/grub/grub.cfg in Ubuntu but this does nothing.
Can anybody offer any advice as to how I might include a viable boot option for OS X in Grub2?

thecarpy 04-16-2010 05:07 PM

try gfxpayload iso gfxmode ... check out this.

thecarpy 04-16-2010 05:13 PM

Oh, and I just came through this blog entry, how to pass parameters directly to the kernel.

PaulFXH 04-17-2010 04:58 AM

Hi thecarpy

Thank you very much for those two very useful replies.
Yes, putting the simple line

into the OS X section of /boot/grub/grub.cfg allowed me to boot OSX86 through Grub2 at the desired resolution.
Although I haven't tried it yet, the second reply also shows how to chainload OS X from Grub2 (which is not as simple as chainloading Windows). So, assuming that will work for me, it should mean I can boot OSX86 through Darwin from Grub2.
As Darwin recognizes while Grub2 doesn't, and as I've included the kernel flag "Graphics Mode"="1680x1050x32" in the Boot.plist file, this should also allow booting to the desired resolution from Grub2.
Thanks again

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