1726226 - [wayland] various menus flicker when using fractional layout scaling factor

Status: RESOLVED DUPLICATE of bug 1708709

(Core :: Widget: Gtk, defect, P3)

Description

[ian-s-mcb]

Attachment: ff_bug-flicker_behavior.gif

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0

Steps to reproduce:

1. Enable Wayland (ie. run MOZ_ENABLE_WAYLAND=1 firefox)
2. Start Firefox
3. Apply fractional layout scale factor (ie. open about:config and set layout.css.devPixelsPerPx=1.2)
4. Click hamburger menu button or any extension menu button

Actual results:

The menu is shown for a split second and subsequently disappears. Moving the mouse cursor occasionally causes the menu to flicker between shown and hidden. Either way, the various menus are unusable.

See attached .gif image for flickering behavior.

Expected results:

Menu flickering shouldn't been present. In Firefox version 90 with Wayland, fractional layout scaling worked fine.

Comment 1

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

The Bugbug bot thinks this bug should belong to the 'Core::Widget: Gtk' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.

Comment 2

[Alberto Berti]

I've stumbled upon the same bug, it wasn't present on older major versions, but I'm unsure which past version was ok.
My setup is a bit different: my layout.css.devPixelsPerPx setting has the default value of -1.0 but I'm using a configuration of my two displays where one has a 1.3 scaling. The display system is Wayland despite what is shown in the user agent string.

After clocking on the hamburger menu I'm experiencing the flickering and a general failure in showing all the foreground temporary windows, like select options, url bar suggestions, classic menu dropdowns. Even the refresh of the page contents sometimes requires me to switch to another workspace and back.

Application Basics
------------------

Name: Firefox
Version: 91.0
Build ID: 20210813171208
Distribution ID:
User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0
OS: Linux 5.13.9 #1-NixOS SMP Sun Aug 8 07:06:57 UTC 2021
Multiprocess Windows: 1/1
Fission Windows: 0/1 Disabled by default
Remote Processes: 4
Enterprise Policies: Inactive
Google Location Service Key: Found
Google Safebrowsing Key: Found
Mozilla Location Service Key: Missing
Safe Mode: false

Firefox Features
----------------

Name: DoH Roll-Out
Version: 2.0.0
ID: [e-mail]

Name: Firefox Screenshots
Version: 39.0.1
ID: [e-mail]

Name: Form Autofill
Version: 1.0.1
ID: [e-mail]

Name: Picture-In-Picture
Version: 1.0.0
ID: [e-mail]

Name: Web Compatibility Interventions
Version: 24.2.0
ID: [e-mail]

Name: WebCompat Reporter
Version: 1.4.2
ID: [e-mail]

Remote Features
---------------

upgradeDialog: (upgradeDialog-defaultEnabled)

Remote Processes
----------------

Type: Web Content
Count: 1 / 8

Type: Privileged About
Count: 1

Type: Extension
Count: 1

Type: Preallocated
Count: 1

Add-ons
-------

Name: Amazon.co.uk
Type: extension
Version: 1.9
Enabled: true
ID: [e-mail]

Name: Bing
Type: extension
Version: 1.3
Enabled: true
ID: [e-mail]

Name: DuckDuckGo
Type: extension
Version: 1.1
Enabled: true
ID: [e-mail]

Name: Google
Type: extension
Version: 1.1
Enabled: true
ID: [e-mail]

Name: Wikipedia (en)
Type: extension
Version: 1.1
Enabled: true
ID: [e-mail]

Graphics
--------

Features
Compositing: WebRender
Asynchronous Pan/Zoom: wheel input enabled; scrollbar drag enabled; keyboard enabled; autoscroll enabled; smooth pinch-zoom enabled
WebGL 1 Driver WSI Info: EGL_VENDOR: Mesa Project EGL_VERSION: 1.5 EGL_EXTENSIONS: EGL_ANDROID_blob_cache EGL_ANDROID_native_fence_sync EGL_EXT_buffer_age EGL_EXT_create_context_robustness EGL_EXT_image_dma_buf_import EGL_EXT_image_dma_buf_import_modifiers EGL_EXT_swap_buffers_with_damage EGL_IMG_context_priority EGL_KHR_cl_event2 EGL_KHR_config_attribs EGL_KHR_create_context EGL_KHR_create_context_no_error EGL_KHR_fence_sync EGL_KHR_get_all_proc_addresses EGL_KHR_gl_colorspace EGL_KHR_gl_renderbuffer_image EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_3D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_image_base EGL_KHR_no_config_context EGL_KHR_reusable_sync EGL_KHR_surfaceless_context EGL_KHR_swap_buffers_with_damage EGL_EXT_pixel_format_float EGL_KHR_wait_sync EGL_MESA_configless_context EGL_MESA_drm_image EGL_MESA_image_dma_buf_export EGL_MESA_query_driver EGL_WL_bind_wayland_display EGL_WL_create_wayland_buffer_from_image EGL_EXTENSIONS(nullptr): EGL_EXT_device_base EGL_EXT_device_enumeration EGL_EXT_device_query EGL_EXT_platform_base EGL_KHR_client_get_all_proc_addresses EGL_EXT_client_extensions EGL_KHR_debug EGL_EXT_platform_device EGL_EXT_platform_wayland EGL_KHR_platform_wayland EGL_EXT_platform_x11 EGL_KHR_platform_x11 EGL_MESA_platform_xcb EGL_MESA_platform_gbm EGL_KHR_platform_gbm EGL_MESA_platform_surfaceless IsWebglOutOfProcessEnabled: 0
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WebGL 1 Extensions: ANGLE_instanced_arrays EXT_blend_minmax EXT_color_buffer_half_float EXT_float_blend EXT_frag_depth EXT_shader_texture_lod EXT_sRGB EXT_texture_compression_bptc EXT_texture_compression_rgtc EXT_texture_filter_anisotropic MOZ_debug OES_element_index_uint OES_fbo_render_mipmap OES_standard_derivatives OES_texture_float OES_texture_float_linear OES_texture_half_float OES_texture_half_float_linear OES_vertex_array_object WEBGL_color_buffer_float WEBGL_compressed_texture_astc WEBGL_compressed_texture_etc WEBGL_compressed_texture_s3tc WEBGL_compressed_texture_s3tc_srgb WEBGL_debug_renderer_info WEBGL_debug_shaders WEBGL_depth_texture WEBGL_draw_buffers WEBGL_lose_context
WebGL 2 Driver WSI Info: EGL_VENDOR: Mesa Project EGL_VERSION: 1.5 EGL_EXTENSIONS: EGL_ANDROID_blob_cache EGL_ANDROID_native_fence_sync EGL_EXT_buffer_age EGL_EXT_create_context_robustness EGL_EXT_image_dma_buf_import EGL_EXT_image_dma_buf_import_modifiers EGL_EXT_swap_buffers_with_damage EGL_IMG_context_priority EGL_KHR_cl_event2 EGL_KHR_config_attribs EGL_KHR_create_context EGL_KHR_create_context_no_error EGL_KHR_fence_sync EGL_KHR_get_all_proc_addresses EGL_KHR_gl_colorspace EGL_KHR_gl_renderbuffer_image EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_3D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_image_base EGL_KHR_no_config_context EGL_KHR_reusable_sync EGL_KHR_surfaceless_context EGL_KHR_swap_buffers_with_damage EGL_EXT_pixel_format_float EGL_KHR_wait_sync EGL_MESA_configless_context EGL_MESA_drm_image EGL_MESA_image_dma_buf_export EGL_MESA_query_driver EGL_WL_bind_wayland_display EGL_WL_create_wayland_buffer_from_image EGL_EXTENSIONS(nullptr): EGL_EXT_device_base EGL_EXT_device_enumeration EGL_EXT_device_query EGL_EXT_platform_base EGL_KHR_client_get_all_proc_addresses EGL_EXT_client_extensions EGL_KHR_debug EGL_EXT_platform_device EGL_EXT_platform_wayland EGL_KHR_platform_wayland EGL_EXT_platform_x11 EGL_KHR_platform_x11 EGL_MESA_platform_xcb EGL_MESA_platform_gbm EGL_KHR_platform_gbm EGL_MESA_platform_surfaceless IsWebglOutOfProcessEnabled: 0
WebGL 2 Driver Renderer: Intel -- Mesa Intel(R) Xe Graphics (TGL GT2)
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GL_EXT_texture_filter_anisotropic GL_EXT_texture_integer GL_EXT_texture_sRGB GL_EXT_texture_sRGB_R8 GL_EXT_texture_sRGB_decode GL_EXT_texture_shadow_lod GL_EXT_texture_shared_exponent GL_EXT_texture_snorm GL_EXT_texture_swizzle GL_EXT_timer_query GL_EXT_transform_feedback GL_EXT_vertex_array_bgra GL_EXT_vertex_attrib_64bit GL_IBM_multimode_draw_arrays GL_INTEL_blackhole_render GL_INTEL_conservative_rasterization GL_INTEL_performance_query GL_INTEL_shader_atomic_float_minmax GL_INTEL_shader_integer_functions2 GL_KHR_blend_equation_advanced GL_KHR_blend_equation_advanced_coherent GL_KHR_context_flush_control GL_KHR_debug GL_KHR_no_error GL_KHR_parallel_shader_compile GL_KHR_robust_buffer_access_behavior GL_KHR_robustness GL_KHR_texture_compression_astc_ldr GL_KHR_texture_compression_astc_sliced_3d GL_MESA_framebuffer_flip_y GL_MESA_pack_invert GL_MESA_shader_integer_functions GL_MESA_texture_signed_rgba GL_NV_compute_shader_derivatives GL_NV_conditional_render GL_NV_copy_image GL_NV_depth_clamp GL_NV_fragment_shader_interlock GL_NV_packed_depth_stencil GL_NV_texture_barrier GL_OES_EGL_image GL_S3_s3tc
WebGL 2 Extensions: EXT_color_buffer_float EXT_float_blend EXT_texture_compression_bptc EXT_texture_compression_rgtc EXT_texture_filter_anisotropic MOZ_debug OES_texture_float_linear WEBGL_compressed_texture_astc WEBGL_compressed_texture_etc WEBGL_compressed_texture_s3tc WEBGL_compressed_texture_s3tc_srgb WEBGL_debug_renderer_info WEBGL_debug_shaders WEBGL_lose_context
Window Protocol: wayland
Desktop Environment: unknown
Target Frame Rate: 60
GPU #1
Active: Yes
Description: Mesa Intel(R) Xe Graphics (TGL GT2)
Vendor ID: 0x8086
Device ID: 0x9a49
Driver Vendor: mesa/iris
Driver Version: 21.1.5.0
RAM: 0

Diagnostics
AzureCanvasBackend: skia
AzureContentBackend: skia
AzureFallbackCanvasBackend: skia
CairoUseXRender: 0
CMSOutputProfile: Empty profile data
Display0: 1920x1200
Display1: 3938x1661
DisplayCount: 2
Decision Log
HW_COMPOSITING:
available by default
OPENGL_COMPOSITING:
available by default
WEBRENDER:
available by default
WEBRENDER_QUALIFIED:
available by default
WEBRENDER_COMPOSITOR:
disabled by default: Disabled by default
blocklisted by env: Blocklisted by gfxInfo
WEBRENDER_PARTIAL:
available by default
WEBRENDER_SHADER_CACHE:
disabled by default: Disabled by default
WEBRENDER_OPTIMIZED_SHADERS:
available by default
WEBRENDER_ANGLE:
available by default
unavailable by env: OS not supported
WEBRENDER_DCOMP_PRESENT:
available by default
disabled by user: User disabled via pref
unavailable by env: Requires Windows 10 or later
unavailable by runtime: Requires ANGLE
WEBRENDER_SOFTWARE:
available by default
OMTP:
disabled by default: Disabled by default
WEBGPU:
disabled by default: Disabled by default
blocked by runtime: WebGPU can only be enabled in nightly
X11_EGL:
available by default
blocklisted by env: Blocklisted by gfxInfo
DMABUF:
available by default




Media
-----

Audio Backend: pulse-rust
Max Channels: 2
Preferred Sample Rate: 48000
Roundtrip latency (standard deviation): 56.49ms (5.73)
Output Devices
Name: Group
Tiger Lake-LP Smart Sound Technology Audio Controller HDMI / DisplayPort 3 Output: /devices/pci0000:00/0000:00:1f.3/skl_hda_dsp_generic/sound/card0
Tiger Lake-LP Smart Sound Technology Audio Controller HDMI / DisplayPort 2 Output: /devices/pci0000:00/0000:00:1f.3/skl_hda_dsp_generic/sound/card0
Tiger Lake-LP Smart Sound Technology Audio Controller HDMI / DisplayPort 1 Output: /devices/pci0000:00/0000:00:1f.3/skl_hda_dsp_generic/sound/card0
Tiger Lake-LP Smart Sound Technology Audio Controller Speaker + Headphones: /devices/pci0000:00/0000:00:1f.3/skl_hda_dsp_generic/sound/card0
Input Devices
Name: Group
Monitor of Tiger Lake-LP Smart Sound Technology Audio Controller HDMI / DisplayPort 3 Output: /devices/pci0000:00/0000:00:1f.3/skl_hda_dsp_generic/sound/card0
Monitor of Tiger Lake-LP Smart Sound Technology Audio Controller HDMI / DisplayPort 2 Output: /devices/pci0000:00/0000:00:1f.3/skl_hda_dsp_generic/sound/card0
Monitor of Tiger Lake-LP Smart Sound Technology Audio Controller HDMI / DisplayPort 1 Output: /devices/pci0000:00/0000:00:1f.3/skl_hda_dsp_generic/sound/card0
Monitor of Tiger Lake-LP Smart Sound Technology Audio Controller Speaker + Headphones: /devices/pci0000:00/0000:00:1f.3/skl_hda_dsp_generic/sound/card0
Tiger Lake-LP Smart Sound Technology Audio Controller Headphones Stereo Microphone: /devices/pci0000:00/0000:00:1f.3/skl_hda_dsp_generic/sound/card0
Tiger Lake-LP Smart Sound Technology Audio Controller Digital Microphone: /devices/pci0000:00/0000:00:1f.3/skl_hda_dsp_generic/sound/card0

Enumerate database

Environment Variables
---------------------

MOZ_LEGACY_PROFILES: 1
DISPLAY: :0
MOZ_PLUGIN_PATH: /home/azazel/.nix-profile/lib/mozilla/plugins:/etc/profiles/per-user/azazel/lib/mozilla/plugins:/nix/var/nix/profiles/default/lib/mozilla/plugins:/run/current-system/sw/lib/mozilla/plugins
MOZ_ALLOW_DOWNGRADE: 1
MOZ_SYSTEM_DIR: /nix/store/i4awklfj9dq7xvz5w10wzyh5sj2vwfbf-firefox-91.0/lib/mozilla
GDK_PIXBUF_MODULE_FILE: /nix/store/2jgs3141z8mk7lv85vkn7ir38w7vzj5w-librsvg-2.50.7/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache
MOZ_APP_LAUNCHER: firefox
MOZ_ENABLE_WAYLAND: 1
MOZ_ASSUME_USER_NS: 1
MOZ_LAUNCHED_CHILD:
XRE_PROFILE_PATH:
XRE_PROFILE_LOCAL_PATH:
XRE_RESTARTED_BY_PROFILE_MANAGER:
XRE_START_OFFLINE:
XRE_BINARY_PATH:

Experimental Features
---------------------

about:home startup cache (browser.startup.homepage.abouthome_cache.enabled): false
Cookies: SameSite=Lax by default (network.cookie.sameSite.laxByDefault): false
Cookies: SameSite=None requires secure attribute (network.cookie.sameSite.noneRequiresSecure): false
Cookies: Schemeful SameSite (network.cookie.sameSite.schemeful): false
CSS: Constructable Stylesheets (layout.css.constructable-stylesheets.enabled): false
CSS: Masonry Layout (layout.css.grid-template-masonry-value.enabled): false
Developer Tools: Color Scheme Simulation (devtools.inspector.color-scheme-simulation.enabled): true
Developer Tools: Compatibility Panel (devtools.inspector.compatibility.enabled): false
Developer Tools: Execution Context Selector (devtools.webconsole.input.context): false
Developer Tools: Service Worker debugging (devtools.debugger.features.windowless-service-workers): false
Fission (Site Isolation) (fission.autostart): false
Media: AVIF (image.avif.enabled): false
Media: JPEG XL (image.jxl.enabled): false
Multiple Picture-in-Picture Support (media.videocontrols.picture-in-picture.allow-multiple): true
Address Bar: show results during IME composition (browser.urlbar.keepPanelOpenDuringImeComposition): false
Web API: inputmode (dom.forms.inputmode): false
Web API: WebGPU (dom.webgpu.enabled): false
WebRTC Global Mute Toggles (privacy.webrtc.globalMuteToggles): false
Win32k Lockdown (security.sandbox.content.win32k-disable): false

Remote Experiments
------------------

Important Modified Preferences
------------------------------

browser.contentblocking.category: standard
browser.search.region: IT
browser.startup.homepage_override.buildID: 20210813171208
browser.startup.homepage_override.mstone: 91.0
browser.urlbar.placeholderName: Google
doh-rollout.balrog-migration-done: true
doh-rollout.doneFirstRun: true
doh-rollout.home-region: IT
dom.push.userAgentID: eebbb4efc6744822b37d25e382126d2a
extensions.lastAppVersion: 91.0
media.gmp.storage.version.observed: 1
network.trr.blocklist_cleanup_done: true
privacy.sanitize.pending: [{"id":"newtab-container","itemsToClear":[],"options":{}}]
security.sandbox.content.tempDirSuffix: 2c0030fe-5f3c-46df-b832-e1f50e055365

Important Locked Preferences
----------------------------

fission.autostart.session: false

Places Database
---------------

Accessibility
-------------

Activated: false
Prevent Accessibility: 0

Library Versions
----------------

NSPR
Expected minimum version: 4.32
Version in use: 4.32

NSS
Expected minimum version: 3.68
Version in use: 3.68

NSSSMIME
Expected minimum version: 3.68
Version in use: 3.68

NSSSSL
Expected minimum version: 3.68
Version in use: 3.68

NSSUTIL
Expected minimum version: 3.68
Version in use: 3.68

Sandbox
-------

Seccomp-BPF (System Call Filtering): true
Seccomp Thread Synchronization: true
User Namespaces: true
Content Process Sandboxing: true
Media Plugin Sandboxing: true
Content Process Sandbox Level: 4
Effective Content Process Sandbox Level: 4
Win32k Lockdown State for Content Process: Win32k Lockdown disabled -- Operating system not supported

Rejected System Calls
---------------------

Startup Cache
-------------

Disk Cache Path: /home/azazel/.cache/mozilla/firefox/025pgybv.blank/startupCache/startupCache.8.little
Ignore Disk Cache: false
Found Disk Cache on Init: false
Wrote to Disk Cache: false

Internationalization & Localization
-----------------------------------

Application Settings
Requested Locales: ["en-US"]
Available Locales: ["en-US"]
App Locales: ["en-US"]
Regional Preferences: ["en-US"]
Default Locale: "en-US"
Operating System
System Locales: ["it-IT"]
Regional Preferences: ["it-IT"]

Remote Debugging (Chromium Protocol)
------------------------------------

Accepting Connections: false
URL:

Printing
--------

Modified print settings
-----------------------

Comment 3

[Alberto Berti]

I'm using Sway compositor, so it may be related or a duplicate of #1722767 , I'll test it on the latest nightly as soon as I find a way to make it work on NixOS

Comment 4

[ian-s-mcb]

@Alberto Berti Thanks for referencing that bug report. I'm also using Sway. Seems like Sway or GTK is the culprit of your issue. See quote from that bug report.

Martin Stránský [:stransky] (ni? me) back on Aug 23
Comment 19 • 7 days ago
This is a bug on Sway side - we don't get xdg_positioner callback from wayland compositor. Let's track that at https://github.com/swaywm/sway/issues/6426

The menu flickering caused by monitor scaling and Firefox-specific scaling sound similar, but I don't want to jump to a conclusion without hearing from a Mozilla dev. I'll keep patient until then.

Comment 5

[Len Jacob]

I too noticed this behavior on Fedora 34 with Gnome 40.4 and Firefox 91.0

Flickering also occurs while clicking on the Tracking and Security buttons to the left of the URL (in addition to the hamburger menu). Some add-ons are affected as well.

Comment 6

[Martin Stránský [:stransky] (ni? me)]

I can reproduce that on layout.css.devPixelsPerPx=1.2 with Mutter too with Pocket extension.