Re: [PATCH v1 0/3] drm/amd/display: passive VRR

[Adolfo <adolfotregosa@gmail.com>]

I tested these patches in conjunction with the HDMI 2.1 VRR ones on 
kernel 7.3-rc1, and VRR still does not engage while on the desktop, only 
in-game.


On 01/09/2026 20:12, Fangzhi Zuo wrote:

> Passive VRR keeps a sink in its variable-refresh state during fixed-refresh
> (desktop) use, avoiding the blanking/brightness flicker that HDMI sinks
> without seamless VRR transitions show on VRR entry/exit. It is opt-out
> (enabled by default where the connector advertises passive_vrr_capable) and
> is not useful for DP/eDP, where seamless VRR transitions are mandated by the
> standard.
>
> Patch 1 adds the DRM core plumbing: the PASSIVE_VRR_DISABLED atomic CRTC
> property and the immutable passive_vrr_capable connector property, with the
> attach/set helpers.
>
> Patch 2 wires these into amdgpu via the existing DC
> stream->freesync_on_desktop path.
>
> Patch 3 fixes the MCCS FreeSync fallback so that HDMI-Forum VRR (HF-VSDB)
> sinks keep freesync_capable; without it passive VRR never engages on the
> very TMDS HF-VSDB sinks it targets.
>
>
> Fangzhi Zuo (1):
>    drm/amd/display: Keep FreeSync for HF-VSDB VRR sinks in MCCS fallback
>
> Tomasz Pakuła (2):
>    drm: Add passive_vrr properties for passive/desktop VRR
>    drm/amd/display: Use passive_vrr properties in amdgpu
>
>   .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h |  1 +
>   .../display/amdgpu_dm/amdgpu_dm_connector.c   | 13 +++-
>   .../display/amdgpu_dm/amdgpu_dm_freesync.c    |  7 ++
>   drivers/gpu/drm/drm_atomic_uapi.c             |  4 +
>   drivers/gpu/drm/drm_connector.c               | 73 +++++++++++++++++++
>   drivers/gpu/drm/drm_crtc.c                    |  2 +
>   drivers/gpu/drm/drm_mode_config.c             |  6 ++
>   include/drm/drm_connector.h                   | 15 ++++
>   include/drm/drm_crtc.h                        |  9 +++
>   include/drm/drm_mode_config.h                 |  6 ++
>   10 files changed, 134 insertions(+), 2 deletions(-)
>
>
> base-commit: 8c77d618886a143de5cd87a35963b4993075802a