How to Determine the Default Display Resolution for a Sun Ray 3 Plus Client

Asset ID:	1-71-1351944.1
Update Date:	2012-09-07
Keywords:

Solution Type Technical Instruction Sure

Solution 1351944.1 : How to Determine the Default Display Resolution for a Sun Ray 3 Plus Client

Applies to:

Sun Ray Hardware - Version Sun Ray 3Plus and later
Sun Ray Software - Version SRS 5.0 and later
Information in this document applies to any platform.

Goal

Is there a "default" resolution that may be expected for the stand-alone Sun Ray 3 Plus Client, and how is that resolution determined?

Note: The Sun Ray 3 Plus Client is a "headless" device; a stand-alone unit that is designed to be attached to an external monitor. The technical capabilities of the Sun Ray 3 Plus are well documented, including the following sites:

Device Data Sheet:
http://www.oracle.com/us/technologies/virtualization/sun-ray-3-plus-ds-065316.pdf

Fix

Summary

Sun Ray Clients without a built-in monitor do not have a preferred "default" resolution. The device communicates with the display to determine the preferred resolution for that display.

Note: This value may be overridden with the utresadm setting, which should be used with care.

Specifics

On start-up, the Sun Ray Client exchanges DDC/EDID data with the attached display to determine the best timing (resolution and refresh) for the display itself, and compares this value to those that it can support until a suitable resolution is agreed upon.

User sessions may then be scaled to a specific size using the utxconfig tool or XRandR. In this scenario, the Sun Ray Client will review the discovered resolutions, and select the one that is the best fit for the session; this value may be different from the preferred resolution of the monitor.

Note: If the DDC/EDID communication between Sun Ray and the attached display fails--specifically, that no usable timings are discovered--the Sun Ray Client will use the meager fallback resolution. In that scenario, the utresadm tool can be used to force the use of a selected (better) resolution for a specific physical client (or client/token combination). Here, the administrator must take care to choose a timing that the monitor supports.

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