From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@freedesktop.org Subject: [Bug 111483] FreeSync LFC breaks under certain circumstances, causing either tearing or stutter Date: Sun, 25 Aug 2019 16:09:31 +0000 Message-ID: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1563822718==" Return-path: Received: from culpepper.freedesktop.org (culpepper.freedesktop.org [IPv6:2610:10:20:722:a800:ff:fe98:4b55]) by gabe.freedesktop.org (Postfix) with ESMTP id 9D4D489F1B for ; Sun, 25 Aug 2019 16:09:31 +0000 (UTC) List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org --===============1563822718== Content-Type: multipart/alternative; boundary="15667493710.b8E5fF4.26081" Content-Transfer-Encoding: 7bit --15667493710.b8E5fF4.26081 Date: Sun, 25 Aug 2019 16:09:31 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.freedesktop.org/ Auto-Submitted: auto-generated https://bugs.freedesktop.org/show_bug.cgi?id=3D111483 Bug ID: 111483 Summary: FreeSync LFC breaks under certain circumstances, causing either tearing or stutter Product: DRI Version: DRI git Hardware: x86-64 (AMD64) OS: Linux (All) Status: NEW Severity: normal Priority: not set Component: DRM/AMDgpu Assignee: dri-devel@lists.freedesktop.org Reporter: tempel.julian@gmail.com I've noticed that there sometimes was tearing (vsync off) when framerate was below VRR range minimum (which is 40 - 144Hz in my case), e.g. in some game= 's videos that run with 30fps and probably also if framerate rapidly drops bel= ow VRR range. I found a way to reliably reproduce the issue during actual game rendering: Start vkquake and load a level. Game's default limiter is set to 200. Open game's console via tilde key (English keyboard layout, button below ESC) and set fps to 35 (should be below any display's VRR range minimum) by typing "host_maxfps 35". -> FreeSync LFC should be broken now and show tearing if vsync isn't turned= on. When changing again to a value that's inside the VRR range, e.g. 100, VRR w= orks perfectly again. When switching back to 35, it's once again broken. The Windows driver doesn't seem to show this issue. linux 5.2.9 (also tested drm-next branch) xf86-video-amdgpu-git e6fce59a071220967fcd4e2c9e4a262c72870761 RX 570 radv of mesa-git ACO branch fc0fdb637b4a028816f5a59b14eda07612e1bc9b --=20 You are receiving this mail because: You are the assignee for the bug.= --15667493710.b8E5fF4.26081 Date: Sun, 25 Aug 2019 16:09:31 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.freedesktop.org/ Auto-Submitted: auto-generated
Bug ID 111483
Summary FreeSync LFC breaks under certain circumstances, causing eith= er tearing or stutter
Product DRI
Version DRI git
Hardware x86-64 (AMD64)
OS Linux (All)
Status NEW
Severity normal
Priority not set
Component DRM/AMDgpu
Assignee dri-devel@lists.freedesktop.org
Reporter tempel.julian@gmail.com 

I've noticed that there sometimes was tearing (vsync off) when=
 framerate was
below VRR range minimum (which is 40 - 144Hz in my case), e.g. in some game=
's
videos that run with 30fps and probably also if framerate rapidly drops bel=
ow
VRR range.

I found a way to reliably reproduce the issue during actual game rendering:
Start vkquake and load a level. Game's default limiter is set to 200. Open
game's console via tilde key (English keyboard layout, button below ESC) and
set fps to 35 (should be below any display's VRR range minimum) by typing
"host_maxfps 35".
-> FreeSync LFC should be broken now and show tearing if vsync isn't tur=
ned on.
When changing again to a value that's inside the VRR range, e.g. 100, VRR w=
orks
perfectly again. When switching back to 35, it's once again broken.
The Windows driver doesn't seem to show this issue.

linux 5.2.9 (also tested drm-next branch)
xf86-video-amdgpu-git e6fce59a071220967fcd4e2c9e4a262c72870761
RX 570
radv of mesa-git ACO branch fc0fdb637b4a028816f5a59b14eda07612e1bc9b

You are receiving this mail because:
  • You are the assignee for the bug.
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