I patched kernel 7.3-rc1 with the passive-VRR patches, but VRR is not engaging while on the desktop.
On Tue, Sep 1, 2026 at 8:16 PM Zuo, Jerry <[email protected]> wrote: > AMD General > > > -----Original Message----- > > From: Adolfo <[email protected]> > > Sent: Monday, August 31, 2026 14:49 > > To: Zuo, Jerry <[email protected]>; [email protected] > > Cc: [email protected]; Wentland, Harry > > <[email protected]>; Tomasz Pakuła > > <[email protected]>; [email protected] > > Subject: Re: [PATCH v4 0/4] HDMI 2.1 VRR and ALLM support > > > > [You don't often get email from [email protected]. Learn why this > is > > important at https://aka.ms/LearnAboutSenderIdentification ] > > > > I patched kernel 7.3-rc1, and I have KDE's Adaptive Sync property set to > > Automatic (Always makes the display gamma flicker). VRR itself is only > > engaged when entering a game. > > > > My display (an LG C1 connected through an Onkyo RZ70 AVR) shows "fixed" > > when VRR is not active. While this seems logical, it causes the display > to go > > blank every time I enter or exit a game, or, even worse, when I alt-tab > while in > > a game. > > > > In my case, I can have periods of up to 10 seconds with no image while > the > > devices in the HDMI chain disagree with each other, and sometimes I lose > the > > image completely. > > > > A kernel parameter to force VRR to always be enabled should be available. > > This would prevent these signal-switching problems, and it is how > "FreeSync" > > actually works and also with the unofficial kernel patches for AMD HDMI > 2.1 > > + VRR on kernel 7.2. > > > > There is also some evidence that keeping VRR active can avoid the mode- > > switch behavior seen on some TVs when VRR is enabled or disabled. > > Thanks for your feedback. Regarding to your concern, I've uploaded another > series of patches for "passive VRR". Please check and see if that works > for you. > > Regards, > Jerry > > > > > On 14/08/2026 17:43, Fangzhi Zuo wrote: > > > This series adds HDMI 2.1 gaming support to amdgpu: Variable Refresh > > > Rate > > > (VRR) derived from the HDMI Forum VSDB (HF-VSDB), and Auto Low- > > Latency > > > Mode (ALLM). It builds on a drm/edid patch that parses the HF-VSDB > > > gaming capabilities into struct drm_hdmi_info. > > > > > > - Patch 1 reports FreeSync from the AMD VSDB (existing mechanism). > > > - Patch 2 (drm/edid) parses the HF-VSDB VRR range and ALLM bit. > > > - Patch 3 enables VRR from the HF-VSDB when the AMD VSDB has no > > range. > > > - Patch 4 signals ALLM_Mode in the HF-VSIF when Gaming-VRR is > active. > > > > > > v1: > > > https://lore.kernel.org/amd-gfx/20260730171754.704049-1-jerry.zuo@amd. > > > com/ > > > v2: > > > https://lore.kernel.org/amd-gfx/[email protected] > > > om/ > > > v3: > > > https://lore.kernel.org/amd-gfx/20260811003921.1398292-1- > > jerry.zuo@amd > > > .com/ > > > > > > Changes since v3: > > > - Drop the content-type based ALLM heuristic. ALLM_Mode is now set > > only > > > for the mandatory Gaming-VRR case (VRR_EN=1 with a sink that > > advertises > > > ALLM), per HDMI 2.1 Section 7.6.6; it is no longer derived from > the > > > content type. > > > > > > Changes since v2: > > > - Fix coding-style issues in the VTEM info-packet code. > > > > > > Fangzhi Zuo (3): > > > drm/amd/display: Add 2.1 FreeSync support for AMD VSDB EDID Block > > > drm/amd/display: Add HDMI 2.1 VRR support from HF-VSDB > > > drm/amd/display: Enable HDMI ALLM for Gaming-VRR > > > > > > Tomasz Pakuła (1): > > > drm/edid: parse HDMI 2.1 gaming (ALLM/VRR) capabilities from > > > HF-VSDB > > > > > > .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 5 +- > > > .../display/amdgpu_dm/amdgpu_dm_connector.c | 71 +++++++++++- > > > .../display/amdgpu_dm/amdgpu_dm_freesync.c | 41 +++++++ > > > .../amd/display/modules/inc/mod_info_packet.h | 4 + > > > .../display/modules/info_packet/info_packet.c | 109 > ++++++++++++++++++ > > > drivers/gpu/drm/drm_edid.c | 42 +++++++ > > > include/drm/drm_connector.h | 47 ++++++++ > > > 7 files changed, 317 insertions(+), 2 deletions(-) > > > > > > > > > base-commit: de2622bbc20276eaaaafa8fdbd374ace1ced28dc >
