Kernel[0]: display: Not usable

At boot time in the kernel.log I get the following message:
Aug 27 09:50:01 MyHost kernel[0]: display: Not usable
I don't know if it is a bug or else, but it seems to slow down of a dozen seconds my login time. At least looking at the timestamps in the log files.
Doesn anyone have a clue about what that means?

Did you find the string "Invalid firmware max backlight setting" ? , so it must be a invalid settings for your backlight which is on your MBP. I thought that problem like a backlight or Display Driver(Which You update). please try reinstalling the software or turn down the brightness. Sorry I'm a fresh university student in Taiwan. If my English is wrong, please reply me. Thank you. God bless you

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==================================
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Kernel[0]: display: Not usable

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