Summary of Changes in Version 1.1a

The version 1.1a CTS update adds two important optional aspects to the v1.1 spec.

• Overclocking
• Dual-Mode
  

All existing v1.1 hardware remains certified at the v1.1 level, and the v1.1a spec is no different with regard to what was tested with v1.1. Both new features are optional, and certifying with neither feature, either feature, or both is permitted.

Displays with an overclocking feature are tested at both their out-of-the-box factory default settings, and also tested in their overclocked mode, while still at maximum resolution. Assuming all VESA Adaptive-Sync Display CTS requirements are met in both modes, the monitor vendor can then use the faster overclocked frequency in the AdaptiveSync Display logo.

A new generation of display hardware has been launched that provides a Dual-Mode user selectable configuration, where the display can be configured to run either at its factory-default out-of-the-box maximum resolution, or in a faster mode at lower resolution. For Dual-Mode display hardware, we have developed a variant of the AdaptiveSync Display logo which illustrates the two mode resolutions and refresh rates at which the display passed the Adaptive-Sync Display CTS.

In the case where a display offers both Dual-Mode and overclocking, it is validated in three configurations:

• Out-of-the-box factory default, using maximum resolution
• Overclocked maximum resolution
• Dual-Mode, reduced resolution, with overclocking also applied if applicable.
  

For hardware meeting these criteria, the Dual-Mode frequencies listed in the Dual-Mode variant of the logo would display the overclocked refresh rates.

Summary of Changes in version 1.1

1. Updated the 5×5 G2G test – a testing sequence of 20 Gray to Gray transitions, to a subset of a 9×9 G2G test, involving 64 Gray to Gray transitions – i.e. all those excluding where the start and end are the same, and when the end value is Code Value 31.
2. Transitioned from a fixed 20% overshoot allowance and fixed 15% undershoot allowance to one using a table of Delta-PQ values, enabling overshoot and undershoot allowance that is better optimized for human perception. The average overshoot for the data set is just slightly below 20%, but is in fact across a greatly increased test set using a 9×9 matrix instead of 5×5 and is thus a substantially improved test suite. The undershoot allowance is even tighter, again using a 9×9 test matrix to increase the scope of the test dramatically, and beyond that the average undershoot is now considerably tighter than 15%
3. Incorporated the Jitter Methodology previously approved for v1.0 that provides a substantially more reliable method for measuring jitter.
4. Incorporated the Factory Default Mode SCR previously approved for v1.0 that enables OEMs shipping to power regulated markets to configure the OSD to meet power regulation.
5. Added additional test tools to the list of recommended tools, and added an additional method to aid with testing of AdaptiveSync + HDR capability.  

View AdaptiveSync 1.0 performance criteria

Table 1

The following table summarizes the Adaptive-Sync Display specifications that vary across the logo performance tiers.

Test	AdaptiveSync	MediaSync
Adaptive-Sync operation maximum refresh rate range	≥ 144 Hz	≥ 60 Hz
Adaptive-Sync operation minimum refresh rate range	≤ 60 Hz	≤ 48 Hz
Testing that Overdrive factory-default setting does not result in excessive Overshoot/Undershoot	See Table 2 below	See Table 2 below
Limit in average of the 64 G2G tests from a 5 × 5 matrix with factory-default overdrive	≤ 5-ms average over the 64 tests	N/A
Flicker(max) on low-variability refresh rate tests	-50 dB	-50 dB
Flicker(max) with high-variability refresh rate tests	-50 dB	Test is not performed as a logo performance tier mandate
If SuccessiveFrameDuration IncreaseTolerance is present, minimum duration for variable	8.5 ms	1 ms
If SuccessiveFrameDuration DecreaseTolerance is present, minimum duration for variable	9.75 ms	1 ms
Video frame-to-frame jitter duration for 23.976- to 60-Hz video frame rates	±0.5 ms	±0.5 ms

Table 2

Table 3

In addition to the logo-specific tests above, all qualifying devices must meet the following specifications that apply to all logo performance tiers:

Test	Requirement	Units
Video Frame Drop Tolerance between minimum and maximum refresh rates reported to the OS	0	Dropped Video Frames
The 10 static frequency video frame rates that are to be supported within the Jitter specification limit, potentially by using display-side or GPU video frame duplication (e.g., frame-doubling, frame-tripling, etc.)	23.976 24 25 29.97 30 47.952 48 50 59.94 60	Hz, Locked Video Frame Rates

For the full details about VESA certification criteria for the AdaptiveSync Display logo, please download the Adaptive-Sync Display Certification Test Specification (version 1.1) from VESA.