The Fn key may not function.
One can control the display settings using the keyboard shortcuts (Fn + F4; Fn + F9); knowing that using the Fn key with other keyboard shortcuts like Fn + F3, Fn + imp écr works fine.
Scope:
The models in the following list are equipped with Intel High-Definition (HD) Graphics card:
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HP EliteBook 8440p Notebook PC
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HP EliteBook 8440w Mobile Workstation
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HP ProBook 6440b Notebook PC
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HP ProBook 6450b Notebook PC
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HP ProBook 6540b Notebook PC
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HP ProBook 6550b Notebook PC
