This feature, called zooming, is useful for temporarily magnifying one part of the
screen to inspect fine details in the user interface or to read small text. It can be disabled
with a ServerLayout entry:
Option "DontZoom"
5.3
86 Chapter 5: Using the X Server
Zooming does not inform clients that the resolution has changed, so nothing is
redrawn on the screen. However, the scrolling effect caused by having a virtual resolution
higher than the physical resolution can be really annoying.
5.3 Changing the Resolution and the Screen
Size Dynamically
Although zooming (Section 5.2) has its place, it??™s often more useful to change both
the screen resolution and the virtual screen size simultaneously to eliminate scrolling.
Besides the resolution, it can be desirable to change the orientation between
landscape and portrait modes (useful on PDAs, tablet PCs, and pivoted monitors)
and to change the refresh rate (handy when switching monitors on-the-fly).
The Rotate and Resize (RANDR) extension (Section 1.15) provides these capabilities.
When instructed, the server will change the resolution, orientation, and refresh
rate of the screen. Clients can use the RANDR extension to request notification of
changes in the screen geometry, and then take appropriate action when such notification
is received; for example, the desktop environment will change the position
and size of panel bars and desktop icons, and the window manager will resize maximized
windows and reposition other windows so that they stay on the screen.
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