Product Documentation

Graphics policy settings

Dec 13, 2013

The Graphics section contains policy settings for controlling how images are handled in user sessions.

Display memory limit

This setting specifies the maximum video buffer size in kilobytes for the session.

By default, the display memory limit is 32768 kilobytes.

Specify an amount in kilobytes from 128 to 131072. Using more color depth and higher resolution for connections requires more memory. If the memory limit is reached, the display degrades according to the Display mode degrade preference setting.

Display mode degrade preference

Note: In XenDesktop 7.0, this policy setting applies only when the Legacy graphics mode policy setting is enabled.

This setting specifies whether color depth or resolution degrades first when the session display memory limit is reached.

By default, color depth is degraded first.

When the session memory limit is reached, you can reduce the quality of displayed images by choosing whether color depth or resolution is degraded first. When color depth is degraded first, displayed images use fewer colors. When resolution is degraded first, displayed images use fewer pixels per inch.

To notify users when either color depth or resolution are degraded, configure the Notify user when display mode is degraded setting.

Dynamic windows preview

This setting enables or disables the display of seamless windows in Flip, Flip 3D, Taskbar Preview, and Peek window preview modes.

By default, this setting is enabled.

Image caching

Note: In XenDesktop 7.0, this policy setting applies only when the Legacy graphics mode policy setting is enabled.

This setting enables or disables caching of images in sessions. When needed, the images are retrieved in sections to make scrolling smoother.

By default, image caching is enabled.

Legacy graphics mode

Applies to XenDesktop 7.0 (Server OS and Desktop OS).

This setting disables the rich graphics experience, providing fallback to the legacy graphics experience to improve scalability over a WAN or mobile connection.

By default, this setting is disabled and users are provided with the rich graphics experience.

Maximum allowed color depth

Note: In XenDesktop 7.0, this policy setting applies only when the Legacy graphics mode policy setting is enabled.

This setting specifies the maximum color depth allowed for a session.

This setting applies only to ThinWire drivers and connections. It does not apply to VDAs that have a non-ThinWire driver as the primary display driver, such as VDAs that use a Windows Display Driver Model (WDDM) driver as the primary display driver. For Desktop OS VDAs using a WDDM driver as the primary display driver, this setting has no effect.  For Windows Server OS VDAs using a WDDM driver, this setting might prevent users from connecting to the VDA. 

By default, the maximum allowed color depth is 32 bits per pixel.

Setting a high color depth requires more memory. To degrade color depth when the memory limit is reached, configure the Display mode degrade preference setting. When color depth is degraded, displayed images use fewer colors.

Notify user when display mode is degraded

Note: In XenDesktop 7.0, this policy setting applies only when the Legacy graphics mode policy setting is enabled.

This setting displays a brief explanation to the user when the color depth or resolution is degraded.

By default, notifying users is disabled.

Queuing and tossing

Note: In XenDesktop 7.0, this policy setting applies only when the Legacy graphics mode policy setting is enabled.

This setting discards queued images that are replaced by another image.

By default, queuing and tossing is enabled.

This improves response when graphics are sent to the user device. Configuring this setting can cause animations to become choppy due to dropped frames.