Display · Class

HDMI to DisplayPort: active adapter class

An HDMI-source to DisplayPort-display path needs a converter designed for that direction; example products use active conversion and auxiliary USB power.

HDMI Type-Aend A

DisplayPortend B

Directionaldirection evidence

Activeconversion

Endpoint map

Start with what is physically represented

HDMI source to DisplayPort display.

HDMI Type-A reference →DisplayPort reference →Compare references with these ends →Canonical cable/adapter note →

Capability ledger

Six questions kept separate

DataNot Applicable

No general-purpose data role represented.

Power / chargingConditional

Example products can use auxiliary USB power.

Evidence: C045A

VideoDocumented

Represents HDMI-source to DP-display conversion.

Evidence: C045A

ConversionActive

Represented direction uses active conversion.

Evidence: C045A

Length / reachNot Established

No class-wide length limit asserted.

Markings / certificationNot Established

No marking scheme asserted.

Explicit unknowns

Exact video modes and auxiliary-power implementation remain product-specific.

Source boundary

Why this profile says what it says

Back to first citation ↑

C045ASource checked · pending review

An HDMI-source to DisplayPort-display path needs a converter designed for that direction; example products use active conversion and auxiliary USB power.

Scope: Consumer identification / documented standard or product class only · review due 2026-12-30

C045BSource checked · pending review

128-HDMI-DISPLAYPORT is explicitly one-way from an HDMI source to a DisplayPort display. Its attached USB-A lead is described for power, and the power table specifies 5 V DC.

Scope: Exact 128-HDMI-DISPLAYPORT. USB connector-type metadata does not establish a USB video-data transport; no generic power demand or charging function inferred. · review due 2027-01-11

C045CSource checked · pending review

128-HDMI-DISPLAYPORT lists 3840 x 2160 at 60 Hz; its notes require both source and display to support that resolution and refresh rate.

Scope: Exact-model stated mode, not independent measured performance, unrestricted HDR/color-mode support or a guarantee for a chain of converters. · review due 2027-01-11

C045DSource checked · pending review

Plugable distinguishes one-way DisplayPort-source to HDMI-display cables from active HDMI-source to DisplayPort-display converters; a typical DP-to-HDMI cable is not a reversible HDMI-to-DP solution.

Scope: General converter direction classification; no exact-model compatibility verdict · review due 2027-01-13

USB-IF · USB4 system overview, 2019

Historical first USB4 generation, up to 40 Gbit/s.

Open source ↗

USB4 system performance overview · Not the ceiling of later USB4 revisions.

Common questions

Questions this record can help resolve

Why can a DisplayPort/HDMI adapter work only one direction?Treat source/sink direction and active/passive conversion as evidence questions rather than assuming a reversible physical path.

Evidence behind this page

Scope first. Source second. Approval separate.

3 linked sources · 4 scoped claims · 0 sources with inspection/access flags.

Page scope: class

Assessment 2026-10-22 · earliest scheduled source review 2026-12-30. This is a recorded-date assessment, not a live source check. Page-level independent review is not established by this panel.

Inspect 3 source scopes, access limits and dates

S036 · HDMI to DisplayPort adapter

StarTech.com · Manufacturer / product-owner domain · inspected 2026-10-07 · due 2027-01-05

Within inspection window

Scoped support: Scoped active HDMI-source to DisplayPort-display example.

Not established / limitations: Exact 128-HDMI-DISPLAYPORT example only. The attached USB lead is for converter power in the scoped description; no USB data path is inferred. Power and supported modes remain product-specific, without a universal compatibility verdict.

Locator: PDF p. 1: USB-A power lead; p. 2: explicit one-way HDMI-source to DisplayPort-display conversion and Hardware table, visually inspected.

S039 · USB4 system overview, 2019

USB-IF · Standards-organization domain · inspected 2026-10-01 · due 2026-12-30

Within inspection window

Scoped support: Historical first USB4 generation, up to 40 Gbit/s.

Not established / limitations: Not the ceiling of later USB4 revisions.

Locator: USB4 system performance overview

S645 · Understanding uni-directional and bi-directional video cables

Plugable Technologies · Manufacturer / product-owner domain · inspected 2026-10-15 · due 2027-01-13

Within inspection window

Scoped support: General manufacturer explanation of cable directionality and active converter categories, not product-specific endorsement

Not established / limitations: The named categories and examples are explanations, not compliance tests of other manufacturers, specific devices or every cable.

Locator: What typically works and what does not; DP source to HDMI / HDMI source to DP rows; last update 20 Aug 2026

Trace 4 claims to their source records

C045A · P045

An HDMI-source to DisplayPort-display path needs a converter designed for that direction; example products use active conversion and auxiliary USB power.

Claim scope: Consumer identification / documented standard or product class only

Source links: S036 · Evidence trail → (private workspace)

C045B · P045

128-HDMI-DISPLAYPORT is explicitly one-way from an HDMI source to a DisplayPort display. Its attached USB-A lead is described for power, and the power table specifies 5 V DC.

Claim scope: Exact 128-HDMI-DISPLAYPORT. USB connector-type metadata does not establish a USB video-data transport; no generic power demand or charging function inferred.

Source links: S036 · Evidence trail → (private workspace)

C045C · P045

128-HDMI-DISPLAYPORT lists 3840 x 2160 at 60 Hz; its notes require both source and display to support that resolution and refresh rate.

Claim scope: Exact-model stated mode, not independent measured performance, unrestricted HDR/color-mode support or a guarantee for a chain of converters.

Source links: S036 · Evidence trail → (private workspace)

C045D · P045

Plugable distinguishes one-way DisplayPort-source to HDMI-display cables from active HDMI-source to DisplayPort-display converters; a typical DP-to-HDMI cable is not a reversible HDMI-to-DP solution.

Claim scope: General converter direction classification; no exact-model compatibility verdict

Source links: S645 · Evidence trail → (private workspace)

Prepare this page for review →Read the evidence method →

Recorded evidence only. An inspection date, publisher label, source link or generated packet is not independent technical review, hardware testing, fabrication approval or a compatibility verdict.