status of hdmi 2.1 on lunar lake

[Dan35]

Hi,

I have an ASUS P5405 laptop with Arc 140v graphics. I want to ask if HDMI 2.1 is supported on this igpu as the information concerning HDMI on linux is contradictory. My monitor has HDMI 2.1 but KDE won't go past 60hz at 4k.

For reference, I’m running Fedora 41 with KDE 6.2.5. I’m on the 6.12.9 kernel and mesa 24.3.3

[MUC]

Intel Core Ultra 200V Series Processors (Lunar Lake) generally support HDMI 2.1 FRL with a maximum bandwidth of 48 Gbps.

Whether this is also available on the physical connector of the device depends on the implementation of the Original Equipment Manufacturer (OEM = ASUS). Unfortunately, I cannot find any data from ASUS that clearly states whether the connector supports HDMI 2.1 TMDS (max 4K @ 60) or HDMI 2.1 Fixed Rate Link (FRL).

Please ask ASUS about this:

https://www.asus.com/support/

Can you please specify the brand and model of the monitor?

[Dan35]

Hi, and thanks for the reply.

The monitor is a samsung neo g8.

I will ask ASUS support about the version.

edit: I did ask, they replied that it supports 4k/2k 60hz (they do not mention the actual HDMI spec, probably it's not documented for customer support?). Well it seems that it probably is TDMS.

Thank you for your time, I didn't know there are multiple HDMI 2.1 standards.

[MUC · Accepted solution]

Samsung Odyssey Neo G8 G85NB

• 2 x HDMI 2.1 FRL
• 1 x DisplayPort 1.4a HBR3
• Display Stream Compression (DSC)
• VESA AdaptiveSync (variable refresh rate)

ASUS ExpertBook P5 P5405

• 1 x HDMI 2.0 (now called HDMI 2.1 TMDS due to HDMI Licensing Administrator, Inc. regulations)
• 2 x USB Type-C (Thunderbolt, DisplayPort 1.4a HBR3)

According to the monitor manual, the maximum resolution is achieved at a pixel clock of 2376 MHz.

3840 x 2160 @ 240 Hz = HBR3 DSC 11 bpp ... OK

Please connect the laptop to the monitor with one of these cables:

• Zeskit MAYA 8K Bi-Directional USB-C to DisplayPort 1.4 Cable
• Club 3D USB Type C Cable to DP 1.4 (CAC-1557)
• Cable Matters USB-C to DisplayPort Cable - 8K Ready (201036)
• Cable Matters Premium Braided USB C to DisplayPort 1.4 Cable (201336)

Use the monitor's On Screen Display (OSD) to set the following:

• Function Key Guide    >> Game >> Adaptive-Sync >> ON 
  • Picture-in-Picture (PIP) Mode must be disabled to activate AdaptiveSync
• Function Key Guide    >> Game >> Refresh Rate >> 240 Hz

Make the desired settings in the Intel Graphics Software, e.g.

[Dan35]

thank you, this must fix it

[Lanakuri89]

It sounds like you’re experiencing some challenges with HDMI 2.1 support and 4K display on your ASUS P5405 laptop with the Arc 140v graphics. HDMI 2.1 support depends on both the hardware and software compatibility, and Linux drivers may sometimes cause limitations in how the graphics output is handled. It might help to check if your GPU drivers are up-to-date or experiment with adjusting settings in KDE or the kernel configuration for better output performance at 4K.

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