Hi Harshvardhan
The reason there are so many of those is your processor is a quad core, with each core having 2 threads and in Device Manager that will appear as 8 processors . .
That processor has Intel HD Graphics 4000 on chip, try installing this latest driver for that Intel Graphics option, which was only released this year, that will hopefully get your brightness control back . . .
https://downloadcenter.intel.com/download/29473...
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