Low resolution Login Screen Yosemite, PRAM reset doesn't work

[Arvind Muthu]

Hi

I run my Late-2013 15" Mac Book Pro Retina running OS X Yosemite (10.10.5) in the highest possible resolution ("More Space"). I have recently noticed that the login screen on first boot up is at the default resolution which looks very low resolution compared to the normal desktop. When I login, the screen flickers a couple of times and the screen resolution is set correctly (to "more space"). If I log out the login screen is at high resolution, so the problem is only on the first boot up.

It would appear that OS X has only recently started doing this as it always booted to a high resolution login screen.

So, after much googling on this topic, I tried a PRAM reset a few days ago but it didn't solve the problem. Looks like plenty of other people say the same too...

Are there any known fixes to this and is this a known bug ?

I tried clean install of OS X Yosemite, but the issue not resolved !!!

Regards
Arvind

 

[Taz Mangus]

I have seen this. I don't believe there is a way to change that.

 

[Arvind Muthu]

OMG !
For last 4 days, I am trying to find some answers, tried almost all the possibilities but no luck !
Its annoying ! such a silly issue, but the apple team can't resolve it !

 

[DeltaMac]

Could that be a difference in the login sequence when using File Vault? Have you recently turned FV on?

 

[Arvind Muthu]

No.... I never used file vault !