osx sierra boot different resolutions between boot 1st stage and 2nd stage

[cicciopolenta]

Hello I already tried following many guide in way to try fix different resolutions between boot 1st stage and 2nd stage without success.

My monitor is a 4K 27" Dell P2715Q, my gfx is evga geforce gtx 970 4gb. Monitor is connected through displayport and everything work perfect from boot 2nd stage, but during 1st stage apple logo is small.
I think this is because monitor boot with its default resolution like 3840x2160, so maybe i would like to need to force use lower resolution like fullhd 1920x1080.
My clover version is 4097, using clover configurator under GUI menu already tried to set 1920x1080 but even is it's setted, it's ignored and monitor always start in 4k resolution.

Any idea on what to do in way to make apple boot logo same size (i'm almost sure it's a matter about resolution).
Thanks in advance.

 

[thescottc]

This is a common issue, see "Graphics boot glitch patch for 10.12":
https://www.tonymacx86.com/threads/readme-common-some-unsolved-problems-in-10-12-sierra.202316/

 

[cicciopolenta]

This is a common issue, see "Graphics boot glitch patch for 10.12":
https://www.tonymacx86.com/threads/readme-common-some-unsolved-problems-in-10-12-sierra.202316/

Thanx for quick answer, I do it as described; look like it even has something to do with CSM bios option.
I found that with CSM disabled it 1st stage boot with small logo as already described in this thread, instead with CSM enabled it 1st stage boot logo size is ok but it is stretched horizontally as picture.