1586929 - Fullscreen video vsync broken on g-sync capable monitors when enabled in nvidia control panel

Status: RESOLVED INCOMPLETE

(Core :: Graphics: WebRender, defect, P3)

Description

[Katelyn Gadd (:kael)]

For the past few weeks I've been noticing that fullscreen youtube videos don't have working vsync on my secondary monitor. If I move the FF window to my primary monitor, fullscreen has vsync there.

Not sure if non-fullscreen videos have vsync, it's harder to tell. I've seen this with both 60fps and 30fps videos.

Comment 1

[Katelyn Gadd (:kael)]

Application Basics

Name: Firefox
Version: 70.0b12
Build ID: 20191002212950
Update Channel: aurora
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko/20100101 Firefox/70.0
OS: Windows_NT 10.0
Launcher Process: Enabled
Multiprocess Windows: 3/3 Enabled by default
Remote Processes: 10
Enterprise Policies: Inactive
Google Location Service Key: Found
Google Safebrowsing Key: Found
Mozilla Location Service Key: Found
Safe Mode: false

Crash Reports for the Last 3 Days

Firefox Developer Edition Features

Name: Firefox Screenshots
Version: 39.0.0
ID: [e-mail]

Name: Form Autofill
Version: 1.0
ID: [e-mail]

Name: Web Compat
Version: 6.1.0
ID: [e-mail]

Name: WebCompat Reporter
Version: 1.1.0
ID: [e-mail]

Remote Processes

Type: Web Content
Count: 8 / 8

Type: Extension
Count: 1

Type: GPU
Count: 1

Extensions

Name: Amazon.com
Version: 1.1
Enabled: true
ID: [e-mail]

Name: Bing
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Enabled: true
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Name: DuckDuckGo
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Enabled: true
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Name: eBay
Version: 1.0
Enabled: true
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Name: Firefox Color
Version: 2.1.5
Enabled: true
ID: [e-mail]

Name: Gecko Profiler
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Enabled: true
ID: [e-mail]

Name: Google
Version: 1.0
Enabled: true
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Name: Image Search Options
Version: 3.0.12
Enabled: true
ID: {4a313247-8330-4a81-948e-b79936516f78}

Name: Owl - For comfortable reading
Version: 2.2.7
Enabled: true
ID: @owl-comfortable-reading-addon

Name: Twitter
Version: 1.0
Enabled: true
ID: [e-mail]

Name: uBlock Origin
Version: 1.22.4
Enabled: true
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Name: User-Agent Switcher
Version: 1.3.12
Enabled: true
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Name: Wikipedia (en)
Version: 1.0
Enabled: true
ID: [e-mail]

Name: Firefox Multi-Account Containers
Version: 6.1.1
Enabled: false
ID: @testpilot-containers

Name: geckoprofiler
Version: 1.16.25
Enabled: false
ID: jid0-edalmuivkozlouyij0lpdx548bc@jetpack

Name: Media Panel
Version: 2.6
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ID: {68d048f4-9449-4c97-8425-6dac7f743b14}

Name: Rikaichan
Version: 3.02b1
Enabled: false
ID: {0AA9101C-D3C1-4129-A9B7-D778C6A17F82}

Name: Test Pilot
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ID: @testpilot-addon

Name: Twitter Block Chain
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ID: {e968fc70-8f95-4ab9-9e79-304de2a71ee1}

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Version: 1.4.1
Enabled: false
ID: {6acd0f4d-ab79-4b79-9b28-8bde65ae355c}

Security Software

Type:

Type:

Type:

Graphics

Features
Compositing: WebRender
Asynchronous Pan/Zoom: wheel input enabled; scrollbar drag enabled; keyboard enabled; autoscroll enabled
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GPU #1
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AzureCanvasBackend (UI Process): skia
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GPUProcessPid: 9580
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Decision Log
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opt-in by default: WebRender is an opt-in feature
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Comment 2

[Paul Adenot (:padenot)]

Thanks for the report and the detailed info, at first glance this seems like an issue related to Web Render, does it repro without (about:config, gfx.webrender.all to false)?

It's probable that with a 2080Ti, on a desktop, it is enabled automatically, in which case it's much more serious, but you seem to also have force-enabled it? If this has happened "for a few weeks" it might coincide with the point in time your configuration started to be qualified for Web Render, and/or a new beta started, or maybe Web Render was enabled all along because you had it force-enabled, and so that would just be a Web Render regression, instead of a regression caused by enabling Web Render.

To try to nail this one down, I tried to prepare a page that has a full-height/width video (but not fullscreen) that is a bit shaky so it's a bit easier (hopefully) to determine whether or no it's tearing also in non-fullscreen: https://paul.cx/public/video-tearing.html

Is this specific to video rendering, or does this happen with regular content as well? Maybe hard to tell, but that would help. Scrolling with the mouse vs. the keyboard can also maybe be a factor (this can change the scrolling method, this is being fixed or has been fixed recently, but I'm sure where we're at).

Sotaro, I'm told you've been tweaking a few things related to the presentation paths on Windows recently, can you have a look?

Comment 3

[Katelyn Gadd (:kael)]

Just tested again to make sure: I don't get any tearing when watching a video outside fullscreen on either monitor, or in fullscreen on monitor A. On monitor B if I enter fullscreen it tears. I can confirm with your tearing test page as well that I only saw tearing in fullscreen.

I realized I actually switched which monitor is primary recently so the one with tearing is actually the primary monitor right now... I'm going to test and see if that has any impact on it.

I haven't seen any tearing in non-video content, but I don't do any browsing in fullscreen mode. I usually scroll with the mouse and have had no problems there.

Comment 4

[Katelyn Gadd (:kael)]

I cleared that pref and restarted and WR is still enabled. Still tears.
For the sake of completeness I also switched my PC's primary monitor and restarted - the same monitor (my ultrawide) is still the one with tearing. So it could have something to do with aspect ratio, or with which monitor is physically first in the enumeration order - as far as I can tell the ultrawide is monitor #2 in the registry etc.

Comment 5

[Sotaro Ikeda [:sotaro]]

(In reply to K. Gadd (:kael) from comment #4)

I cleared that pref and restarted and WR is still enabled. Still tears.

WebRender can be forcibly disabled by pref gfx.webrender.force-disabled : true.

Comment 6

[Katelyn Gadd (:kael)]

Restarting after force-disabled=true eliminates the tearing on fullscreen video (confirmed it works correctly on both monitors)

Comment 7

[Sotaro Ikeda [:sotaro]]

(In reply to K. Gadd (:kael) from comment #6)

Restarting after force-disabled=true eliminates the tearing on fullscreen video (confirmed it works correctly on both monitors)

From it, DXGI_SWAP_EFFECT_FLIP_SEQUENTIAL SwapChain usage or DirectComposition usage might be related to triggering the problem.

Comment 8

[Sotaro Ikeda [:sotaro]]

(In reply to Paul Adenot (:padenot) from comment #2)

Sotaro, I'm told you've been tweaking a few things related to the presentation paths on Windows recently, can you have a look?

The recent changes seemed not to cause the tearing. Basically rendering to D3D should not cause the tearing. From it, it might be a problem of GPU driver.

Comment 9

[Katelyn Gadd (:kael)]

Both of these panels are g-sync compatible and I have it enabled on the monitor that tears, so that could be a factor. G-sync is disabled for firefox though and does not appear to be engaged while FF is in use.

Comment 10

[Timothy Nikkel (:tnikkel)]

Sotaro, can you set priotity?

Comment 11

[Timothy Nikkel (:tnikkel)]

Bug 1588544 seems almost the same, not dupeing just yet because the gfx cards are different. Since these two came up within days perhaps this is a recent regression? Maybe someone who sees this can do a quick check if this regressed recently.

Comment 12

[Katelyn Gadd (:kael)]

I just tested since a reddit comment mentioned it, and hitting F11 to 'fullscreen' the tab also produces tearing when scrolling, so it's not video-specific, it's from fullscreen mode (I guess F11 and the fullscreen API function the same?)

I saw some mentions of this being caused by gsync, which is weird because it's not enabled for firefox (the driver control panel explicitly forbids you from enabling gsync on chrome or firefox).

I can confirm that if I disable g-sync globally in my driver settings, the fullscreen tearing goes away. So this is g-sync, somehow?

Comment 13

[Katelyn Gadd (:kael)]

Updating title based on figuring out what this is (it's not related to primary/secondary monitors, just that my secondary is the only one with official gsync support)

Comment 14

[Sotaro Ikeda [:sotaro]]

(In reply to Timothy Nikkel (:tnikkel) from comment #10)

Sotaro, can you set priotity?

:jbonisteel is a better person for the priority. Forward the question to her.

Comment 15

[Sotaro Ikeda [:sotaro]]

:jrmuizel, is there a PC that could test G-Sync in Toronto office? I do not have a PC to test it.

Comment 16

[Trevor Rowbotham [:rowbot]]

Nvidia did fix a bug recently regarding flickering in fullscreen YouTube videos in Firefox when GSync was enabled, which may or may not be related.

[Firefox][G-SYNC]: When G-SYNC is enabled, flickering occurs with YouTube full-screen video playback on FireFox when hovering over the timeline. [200544130]

There is also a hotfix (436.51) driver available that you could try even though it only lists unrelated fixes.

Comment 17

[Jeff Muizelaar [:jrmuizel]]

We purchased a g-sync monitor for Toronto. It should get here Thursday.

Comment 18

[Sotaro Ikeda [:sotaro]]

(In reply to Jeff Muizelaar [:jrmuizel] from comment #17)

We purchased a g-sync monitor for Toronto. It should get here Thursday.

Thanks!

Comment 20

[Jeff Muizelaar [:jrmuizel]]

Katelyn, do you see the problem if you have only one monitor connected?

Comment 21

[Katelyn Gadd (:kael)]

I just used Win-P to 'duplicate' the g-sync monitor to my non-g-sync monitor (so I have one desktop the size of the g-sync monitor) and the tearing appears to not be happening.

Comment 22

[Jeff Muizelaar [:jrmuizel]]

(In reply to Katelyn Gadd (:kael) from comment #21)

I just used Win-P to 'duplicate' the g-sync monitor to my non-g-sync monitor (so I have one desktop the size of the g-sync monitor) and the tearing appears to not be happening.

If you have only the g-sync monitor connected do the tearing happen?

Comment 23

[Katelyn Gadd (:kael)]

Disabling the other monitor in control panel (so only the g-sync monitor is enabled) does not appear to remove the tearing, for some reason. I will see if it goes away after a reboot later on.

Comment 24

[Jessie [:jbonisteel] pls NI]

Hey Alexis - we could use a hand trying to reproduce this. We bought a g-sync monitor in the office in TO.

Comment 25

[Aria Beingessner [:Gankra]]

Sadly couldn't reproduce this in the office.

:kael, this didn't happen to mysteriously go away for you in the past two weeks did it??

Otherwise it's probably either monitor-specific or specific to nvidia's Turing microarch (we don't have any of those cards).

---

Steps taken to reproduce:

• tried both a GTX 950 and a GTX 1080
• hooked up to our gsync "predator" monitor
• tried both the latest driver and the reported driver (436.48, the "oct 1st" release)
• ensured gsync was working by booting up The Witness with the "G-Sync Indicator" (also to add some system load)
• tried some fullscreen video and fullscreen scrolling
• messed around with whether gsync was configured to run only fullscreen or windowed

Comment 26

[Aria Beingessner [:Gankra]]

Oh! Apparently one of our coworkers was seeing this at home on his 2080, gonna get help from him.

Comment 27

[Aria Beingessner [:Gankra]]

Hey Roger, you don't need to bring your 2080 in just yet, just some simple checks before we proceed:

• Check that this happens in the latest nightly (and stable) (bonus: it would be nice to have a mozregression to when it started happening)
• Check that this happens on the latest nvidia drivers and windows version (bonus: it would be nice to know what range of nvidia drivers it's broken on)
• Check if it happens in Chrome or Edge or anything else

Note that this appears to only happen with webrender, so make sure that the browser is launched with gfx.webrender.enabled=true! (not a live pref)

Comment 28

[Katelyn Gadd (:kael)]

Still reproducing, ff71.0b7 and nvidia driver 441.08.

Could be due to display geometry? I'm using a 3840x2160 monitor and a 3440x1440 monitor. The latter is the g-sync panel which has the tearing issue. I know in the past FF has had rendering issues that only appeared when your desktop was big enough to put strain on the compositor, so that could be a factor here.

Comment 29

[Tibor Mezei]

Installing nvidia driver 441.12 fixed the problem for me.

Firefox versions I used when the issue was happening: 71b1 - 71b7

My monitor setup: 4K gsync monitor and VR headset.

Comment 30

[BugBot [:suhaib / :marco/ :calixte]]

Bugbug thinks this bug is a regression, but please revert this change in case of error.

Comment 31

[royang51]

Tested with 441.12 with Nightly on Nov 9th 2019 on Windows 10 on a LG 144hz monitor (g-sync compatible). With prime video it still shows the tearing issue.

Comment 32

[Aria Beingessner [:Gankra]]

Spent the afternoon messing around with the RTX 2080 and gsync, sadly with no results.

I'm trying to isolate what the possible variables could be, and my completely baseless assumption is that it's some property of the monitor.

The monitor I'm testing on is the Predator XB1. Listed specs:

• Screen Size: 23.8"
• Maximum Resolution: (WQHD)2560 x 1440@144 Hz
• Aspect Ratio: 16:9
• Response Time: 1 ms
• Overclock Refresh Rate: 165 Hz
• Colour Support: 16.7 Million
• Brightness: 350 cd/m²
• Backlight: LED
• Panel Type: TN (Twisted Nematic Film)
• Ports & Connectors: HDMI®(1.2); 5x USB 3.0
• Power: 27 W (ENERGY STAR® On)
• Tearing Prevention Technology: NVIDIA® G-SYNC®
• Dimensions (W x H x D): 541 mm x 326 mm x 64 mm

One interesting detail is that I believe this is a "true" g-sync monitor, and not simply a "g-sync compatible" one. Roger's was "g-sync compatible". Which is yours, :kael? Does anything stand out in the specs of this monitor as wildly different? Also if possible could you give the exact monitor models you're using?

Comment 33

[Katelyn Gadd (:kael)]

The monitor that shows tearing is an ASUS PG348Q which has native G-Sync. The max resolution is 3440x1440. The max refresh rate is 100hz, and I run my desktop at full resolution / 60hz.

My other monitor is a BenQ PD2700U, which has native freesync but no g-sync support. It is not listed as g-sync compatible, so to do VRR on it I have to force it on in the driver. (I haven't done so.) It has a maximum resolution of 3840x2160 and a max refresh rate of 60hz. I also run it at full resolution / 60hz.

I don't expect it would matter but while both panels are listed as 10-bit on their spec sheet, the "display adapter properties" for the PD2700U displays 10-bit while the PG348Q displays 8-bit. I suspect this is because the BenQ is a HDR monitor (I have Windows' HDR turned off, however).

The XB1 is a native G-Sync monitor, yes. I assume you're running the desktop at 60hz as well?

Comment 34

[Aria Beingessner [:Gankra]]

Hey sotaro, we can't reproduce this in the office, and I can't find any clear variables that distinguish what we have from what the reporters have.

Anything you think would be interesting for our coworker Roger to try at home? about:config flags, or maybe some kind of instrumented build we'd want to toss his way? Anything that could help us isolate the problem at all.

Comment 35

[Sotaro Ikeda [:sotaro]]

There is a similar bug on chromium, it also uses NVIDIA GeForce RTX 2080 Ti as comment 1.

• https://bugs.chromium.org/p/chromium/issues/detail?id=1023196

Comment 36

[Sotaro Ikeda [:sotaro]]

Anything you think would be interesting for our coworker Roger to try at home? about:config flags, or maybe some kind of instrumented build we'd want to toss his way?

We could test whether DXGI_SWAP_EFFECT_FLIP_SEQUENTIAL usage or compositor window usage trigger the problem by testing the following config combinations.

• [1] Enable WebRender + Compositor window + DirectComposition + DXGI_SWAP_EFFECT_FLIP_SEQUENTIAL
  • gfx.webrender.all: true
  • gfx.webrender.dcomp-win.enabled: true
  • gfx.webrender.compositor: false
• [2] Enable WebRender + DXGI_SWAP_EFFECT_FLIP_SEQUENTIAL
  • gfx.webrender.all: true
  • gfx.webrender.dcomp-win.enabled: false
  • gfx.webrender.flip-sequential: true
• [3] Enable WebRender + DXGI_SWAP_EFFECT_SEQUENTIAL
  • gfx.webrender.all: true
  • gfx.webrender.dcomp-win.enabled: false
  • gfx.webrender.flip-sequential: false
• [4] Enable WebRender + Compositor window + DirectComposition + DC layers(os compositor)
  • gfx.webrender.all: true
  • gfx.webrender.dcomp-win.enabled: true
  • gfx.webrender.compositor: true

Comment 37

[Sotaro Ikeda [:sotaro]]

From Comment 35, it might better to ask NVIDIA about the problem.
:jrmuizel, how do you think about it?

Comment 38

[Katelyn Gadd (:kael)]

Attachment: image.png

Could this be related to win10's game mode? It's on by default, but I have it disabled.

There's also this option I've never seen before, though I've never changed it. Perhaps it defaulted to on for other people?

Comment 39

[Aria Beingessner [:Gankra]]

Roger, can you try out the things described in https://bugzilla.mozilla.org/show_bug.cgi?id=1586929#c36 ?

Comment 40

[Roger Yang [:royang]]

Hi Alexis, tried all four combinations and the vertical sync issue is still reproducible in all four cases. Thanks,

Comment 41

[Martin]

Just wanted to say that the suggested combination [3] apparently fixed tearing for me so far!
All other combinations [1], [2] and [4] didn't.

I also had tearing issues in firefox fullscreen mode when gsync is enabled.

At first I only noticed it on fullscreen youtube video.

But with this test it's very easy to spot (heavy tearing in fullscreen, no issues in window mode)
https://www.testufo.com/chase#background=404040&leading=ffffff&trailing=00ffff&distance=32&pps=960&height=-1

(GTX1080, Nvidia 441.41, Asus MG279 Monitor (not officially gsync compatible))

Comment 42

[Katelyn Gadd (:kael)]

I can confirm that option [3] did fix the issue for me after a restart. flip-sequential was already false, though, and i had set webrender.all back to false (qualified was true, so I think I already had WR by default anyway)

Comment 43

[Katelyn Gadd (:kael)]

I should note that it feels like I get more dropped frames now, but it's hard to verify that. If there's a good way to record data on that (some webrender flag?) let me know so I can investigate.

Comment 44

[Jeff Muizelaar [:jrmuizel]]

So I was able to reproduce what Roger is seeing. The critical piece was setting "Vertical sync" to "Off" in the NVIDIA Control Panel. Can everyone else who's seeing this check what that is set to and report it here?

Comment 45

[Katelyn Gadd (:kael)]

Attachment: global settings (kg)

Comment 46

[Katelyn Gadd (:kael)]

Attachment: program settings (kg)

Comment 47

[max.nuding]

(In reply to Jeff Muizelaar [:jrmuizel] from comment #44)

So I was able to reproduce what Roger is seeing. The critical piece was setting "Vertical sync" to "Off" in the NVIDIA Control Panel. Can everyone else who's seeing this check what that is set to and report it here?

I had mine set to "use 3D Application Setting".
Changing it to "On" resolves the issue

Comment 48

[Simao]

I have the same issue, only in fullscreen, but I don't have G-Sync.

OS: Arch Linux
Kernel: Linux 5.8.3
Graphics: NVIDIA GeForce GTX 660 (proprietary driver)
One monitor, 1920x1080.

The issue does not appear outside of fullscreen mode.

Comment 49

[Simao]

I forgot to mention in my previous comment, I'm using Firefox version 81.0b1

Comment 50

[BugBot [:suhaib / :marco/ :calixte]]

The severity field for this bug is relatively low, S3. However, the bug has 5 See Also bugs.
:gw, could you consider increasing the bug severity?

For more information, please visit auto_nag documentation.

Comment 51

[BugBot [:suhaib / :marco/ :calixte]]

Clear a needinfo that is pending on an inactive user.

Inactive users most likely will not respond; if the missing information is essential and cannot be collected another way, the bug maybe should be closed as INCOMPLETE.

For more information, please visit auto_nag documentation.