Screen is dim after reboot

I'm hoping someone can assist.  I'm not the best at the Mac OS, but I'm having an issue where I had to reboot my Macbook Pro (2011).  When it restarted, the screen is really dim and when I try to log in, I get some status bar at the bottom that only goes about 25% of the way, then the screen goes completely black.  I have no idea what to do. 

 has found a workaround.  Thank you, aplgc."Futher testing has given me a reasonable work-around until a new display driver can be distributed. I have changed the the keyboard sleep button action to HIBERNATE.    {control panel} {power options} {edit plan settings} {change advanced power settings}  under {power buttons and lid}- select Sleep button action & set to Hibernate. I have also set the auto sleep timer to a longer time  {1hour).  So now when I use the keyboard sleep key,  the computer hibernates instead of sleep.   This requires a power button press to resume, but the screen brightness is normal and all is well.     If  an auto sleep has occured and the screen is dim--a hibernate cycle will restore brightness without rebooting. Hope this works for others".Source    

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