New Patches Present HDMI VRR & Auto Low Latency Mode Gaming Features For AMD Linux GPU Driver

Support for newer HDMI options within the open-source AMD Linux graphics driver have been restricted on account of being blocked by the HDMI Forum. There are although some new HDMI gaming options being enabled by way of new AMDGPU kernel driver patches which can be coming exterior of AMD and primarily based on public information and/or “trying things out until they work/break” for performance like HDMI Variable Refresh Rate (VRR) and Auto Low Latency Mode.

Tomasz Pakuła has been engaged on these new HDMI options for the AMDGPU Linux driver. He’s despatched out a number of completely different patch sequence not too long ago whereas immediately despatched out the newest patches and mixed it right into a single patch sequence for “HDMI Gaming Features”. Pakuła sums up the work as:

– Fixes VRR not detected if monitor makes use of GTF flag for ranges
as an alternative of Range Limits Only
– Detects if AMD vsdb carries a wider VRR vary and makes use of it as an alternative
– DP->HDMI PCON modifications which features a module property to override
PCON ID test
– Parses HDMI gaming options in generic drm
– Reintroduces correct HF-VSIF and VTEM information packets
– Adds assist for Auto Low Latency Mode
– Adds assist for HDMI VRR

The AMDGPU driver has lengthy supported VRR/FreeSync with DisplayPort outputs whereas this will get HDMI VRR working too.

HDMI Auto Low Latency Mode is an HDMI 2.1 function for “Game Mode” for a smoother and extra responsive gaming session by serving to to scale back enter lag.

As for making these HDMI options work given the previous troubles on account of HDMI Forum restrictions, this performance was sorted out utilizing public data and easily making an attempt till issues labored:

“Everything in this patch series has been based on already public code/knowledge or trying things out until they work/break.”

Those can see this patch series for these HDMI Gaming Features for the AMDGPU kernel driver.

Here’s to hoping the newest patch overview goes properly and that there will not be any considerations by AMD over upstreaming these modifications into the AMDGPU Linux kernel driver.