Dell P1917S 19" 5:4 IPS Monitor - Manual (Page 56)

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| Operating your monitor
Rotating the Monitor
Before you rotate the monitor, your monitor should be fully vertically extended
(
Vertical Extension ) and fully tilted up to avoid hitting the bottom edge of the monitor.
1
2
90°
90°
NOTE: To use the Display Rotation function (Landscape versus Portrait view)
with your Dell computer, you require an updated graphics driver that is not
included with this monitor. To download the graphics driver, go to
www.dell.
com/support and see the Download section for Video Drivers for latest driver
updates.
NOTE: When in the Portrait View Mode, you may experience performance
degradation in graphic-intensive applications (3D Gaming and etc.).