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gnome: backport mutter ScreenCast frame-limiter fix (remote desktop 30 -> 60 fps) #14

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CanuteTheGreat merged 1 commit from fix/mutter-screencast-limiter into main 2026-11-05 22:42:32 -08:00

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CanuteTheGreat commented 2026-11-05 09:03:18 -08:00

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Mutter 49/50/51.1 cap every monitor ScreenCast stream at 30-40 fps on a 60 Hz panel (expected-presentation-time jitter vs a delta < interval test; upstream fixed it on gnome-51/main on 2026-10-14, after 51.1, not in any 50.x).

Measured on gringotts and hogshead (GNOME 49.9, mutter 49.7 + this patch, 1080p): H.264 motion path 30.1 -> 59.6-59.9 fps, p50 39-52 ms. GNOME 50.6 alone: still 30.1 fps, so the move to ~amd64 GNOME 50 was not needed.

• patch under gnome-light portage/patches + sys-apps/horcrux-repo-config-1-r3 (installed machines)
• make.conf --usepkg-exclude=x11-wm/mutter (binary packages ignore patches)
• gnome-light image build fails when libmutter lacks the patched string
• tests: build/live-iso/common/tests/test_mutter_patch.py

Not built here: a full image (the first desktop emerge now compiles mutter from source, +10-20 min). Both lab laptops already run it (patch + make.conf applied by hand). Drop the patch + exclude when mutter >= 51.2 is stable.

Mutter 49/50/51.1 cap every monitor ScreenCast stream at 30-40 fps on a 60 Hz panel (expected-presentation-time jitter vs a `delta < interval` test; upstream fixed it on gnome-51/main on 2026-10-14, after 51.1, not in any 50.x). Measured on gringotts and hogshead (GNOME 49.9, mutter 49.7 + this patch, 1080p): H.264 motion path 30.1 -> 59.6-59.9 fps, p50 39-52 ms. GNOME 50.6 alone: still 30.1 fps, so the move to ~amd64 GNOME 50 was not needed. * patch under gnome-light portage/patches + sys-apps/horcrux-repo-config-1-r3 (installed machines) * make.conf `--usepkg-exclude=x11-wm/mutter` (binary packages ignore patches) * gnome-light image build fails when libmutter lacks the patched string * tests: build/live-iso/common/tests/test_mutter_patch.py Not built here: a full image (the first desktop emerge now compiles mutter from source, +10-20 min). Both lab laptops already run it (patch + make.conf applied by hand). Drop the patch + exclude when mutter >= 51.2 is stable.

CanuteTheGreat added 1 commit 2026-11-05 09:03:18 -08:00

gnome: backport mutter's ScreenCast frame-limiter fix (remote desktop was capped at 30-40 fps on 60 Hz displays) ... 58935d8bbe

Mutter 49/50/51.1 skip a monitor-stream frame that arrives < one stream interval after the last (interval = refresh rate) using jittery expected
presentation times, so a stream at the refresh rate loses every other frame. Upstream fixed it on gnome-51/main (stream-source: Round to nearest interval
boundary in is_it_too_early, Oct 2026) but not in 51.1 or any 50.x. Measured on gringotts (Iris Xe, GNOME 49.9): H.264 motion path 30.1 -> 59.6 fps (1080p@59.934);
GNOME 50.6 alone gave 30.1 fps (same limiter), so moving to ~amd64 GNOME 50 would not have helped.

* gnome-light portage patch + sys-apps/horcrux-repo-config-1-r3 ships it to /etc/portage/patches/x11-wm/mutter (installed machines)
* make.conf: --usepkg-exclude=x11-wm/mutter (binary packages ignore patches)
* image build fails when libmutter lacks the patched string; test_mutter_patch.py

CanuteTheGreat merged commit 48dcb672c7 into main 2026-11-05 22:42:32 -08:00

CanuteTheGreat deleted branch fix/mutter-screencast-limiter 2026-11-05 22:42:32 -08:00

CanuteTheGreat referenced this pull request from a commit 2026-11-05 22:42:34 -08:00

Merge pull request 'gnome: backport mutter ScreenCast frame-limiter fix (remote desktop 30 -> 60 fps)' (#14) from fix/mutter-screencast-limiter into main

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