Mac mini 2012 with Dell P2415Q

[avk458]

Mac mini 2012 late
8G ram
Intel Graphics HD4000 (default VRAM 1536MB modify to 2048MB)
The system is 10.11.4 , working 1080P x 30Hz HiDPI on P2415Q with DisplayPort
But I got some problems,it will shows blurred screen on boot and first time login in.
If I logout once, it will work perfectly .
Is there any way to fix this problem? thanks a lot!

 

[jpietrzak8]

Intel Graphics HD4000 (default VRAM 1536MB modify to 2048MB)

I'm probably not the right person to comment on this issue, but from the screenshots, it looks to me like the screen is not blurry, but rather that there's trash on the screen. Which, in my experience, has happened when something has been overwriting video memory with other data. And, therefore, leads me to ask: in what manner have you modified the memory sharing limits for the HD4000 GPU? And have you tried running without the modification?

My guess would be that OS X (or some other running app) is getting confused about the region of memory being used by the GPU...

 

[avk458]

I'm probably not the right person to comment on this issue, but from the screenshots, it looks to me like the screen is not blurry, but rather that there's trash on the screen. Which, in my experience, has happened when something has been overwriting video memory with other data. And, therefore, leads me to ask: in what manner have you modified the memory sharing limits for the HD4000 GPU? And have you tried running without the modification?

My guess would be that OS X (or some other running app) is getting confused about the region of memory being used by the GPU...

Thanks for your comment, I'm thinking of reinstallation.

 

[avk458]

When I got into recovery mode, it displayed like this.

 

[jpietrzak8]

When I got into recovery mode, it displayed like this.
View attachment 625549

Yeah, that definitely looks like graphics memory is being written to or read from in the wrong order, with the bottom half of that window being split into regions like that. I would definitely try to undo the GPU modification. (Just starting recovery mode wouldn't be enough to do that...)

 

[avk458]

Yeah, that definitely looks like graphics memory is being written to or read from in the wrong order, with the bottom half of that window being split into regions like that. I would definitely try to undo the GPU modification. (Just starting recovery mode wouldn't be enough to do that...)

Thanks a lot! Yes I undo the GPU modification, but the boot screen "broken" all the time.