VESA Publishes Embedded DisplayPort (eDP) Standard Version 1.5

guest · Oct 28, 2021

Embedded DisplayPort 1.5 Specification Published
October 28, 2021
https://www.phoronix.com/scan.php?page=news_item&px=Embedded-DisplayPort-1.5

It's been six years already since VESA published the Embedded DisplayPort 1.4b specification while finally it's been succeeded by eDP 1.5.

Embedded DisplayPort 1.5 retains backwards compatibility with v1.4 but adds an improved Panel Self Refresh (PSR) protocol, better Adaptive-Sync capabilities, and more. Embedded DisplayPort is commonly used by laptop panels.
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Building on Panel Self Refresh, eDP 1.5 adds Panel Replay Protocol similar to DP 2.0 for delivering more power-savings. Embedded DisplayPort 1.5 also adds new protocols around newer panel types like OLED displays, and a variety of other improvements to the specification.
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VESA: VESA Publishes Embedded DisplayPort (eDP) Standard Version 1.5

guest · Oct 29, 2021

A tweaked display cable might give your next laptop slightly better battery life
October 29, 2021
https://www.theverge.com/2021/10/29...edp-1-5-panel-self-refresh-oled-adaptive-sync

Don’t you love standards? I do, for the most part, particularly when they’re fixing things, and the new VESA Embedded DisplayPort 1.5 (or eDP 1.5 for short) looks likely to do that in future fancy-screened laptops. It’s promising more power savings with adaptive-sync screens, OLED panels, and displays that come with their own embedded memory for the battery saving Panel Self-Refresh (PSR) feature.

eDP is the standard for cables and ribbons that connect your high-res screen to the rest of your laptop or tablet, and technically it’s supported all those things before — but they haven’t necessarily played nicely together.
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You probably shouldn’t expect much additional battery life here: in each of these cases (adaptive sync, OLED and PSR), VESA’s generally talking about additional runtime when your screen isn’t working very hard — perhaps not even moving at all.

Adaptive sync can tell your GPU to spit out fewer frames to match a slower refresh rate of your screen, saving power. Panel Self-Refresh can tell your GPU to produce no additional frames at all since the memory in your display could just store the current screen image in its frame buffer.
Now, VESA says eDP 1.5 adds Panel Replay, a feature also coming to the delayed DisplayPort 2.0 for external monitors and desktop GPUs — it allows your computer to update part of your screen while leaving the rest untouched, and it works with adaptive sync.
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Overall, “eDP 1.5 achieves power saving by enabling the GPU to briefly power down between frames, which combined with the capability to adjust the frame rate based on workload, allows for additional power saving opportunities,” writes VESA’s chairman. “ We look forward to the increased battery life this will enable across a broad spectrum of laptop PCs.”
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VESA Publishes Embedded DisplayPort (eDP) Standard Version 1.5

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