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0002's upstream-shape patch turned out to be semantically equivalent to stock (sync_file snapshots fences at export, polling the dmabuf fd tracks later-added fences — the patch swaps one ioctl for one F_DUPFD with a behaviour change Mutter explicitly moved away from on amdgpu). Hosts running 0002 are effectively stock and stall during V4L2 stateless playback because the producer doesn't populate dma_resv exclusive fences, so the sync_file is a stub and KWin waits forever. 0001 (bypass the watchDmaBuf wait entirely) is the working downstream carry. Trade-off is that frames can present before the producer signals, but on V4L2 stateless hardware where no fence is populated at all, there's nothing to wait for in practice. Upstream fix lives in the linux-media RFC (vb2 dma_resv producer fences, sent 2026-04-29). Once that lands and producer drivers opt in, the 0001 carry can be retired and the upstream-shape 0002 reconsidered. Both patches stay on disk; 0002 is not being upstreamed (MR 9157 closed on reviewer feedback).
126 lines
3.8 KiB
Bash
126 lines
3.8 KiB
Bash
# Maintainer: Markus Fritsche <mfritsche@reauktion.de>
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# Upstream maintainers: Felix Yan, Antonio Rojas
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# Contributor: Andrea Scarpino <andrea@archlinux.org>
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#
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# kwin-fourier — KWin 6.6.4 with the V4L2-stateless implicit-sync
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# transaction wait bypass. Hypothesis: KWin's
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# `Transaction::watchDmaBuf` calls DMA_BUF_IOCTL_EXPORT_SYNC_FILE on
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# every plane of every imported dmabuf and parks the transaction on a
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# QSocketNotifier waiting for the resulting sync_file fd to become
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# readable. For V4L2 hantro CAPTURE buffers on RK3566 mainline 6.19,
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# that fence either never signals or signals so late that chrome's
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# 6-buffer V4L2 capture pool exhausts at ~6 seconds, blocking the
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# decoder. mpv (single-surface attach pattern) merely slideshows
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# under KWin (76% drop rate); chrome (subsurface attach) deadlocks.
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#
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# This experimental build no-ops `watchDmaBuf` to test the
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# hypothesis. If chrome plays through end-to-end at the recorded
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# 34.7% CPU number, the bug is confirmed and the upstream fix can be
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# refined (e.g., short timeout, skip-on-V4L2, or use the dmabuf fd
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# directly without exporting an extra sync_file). See
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# ../chromium-fourier/KWIN_PIVOT.md for the full diagnosis thread.
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pkgname=kwin
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pkgver=6.6.4
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_dirver=$(echo $pkgver | cut -d. -f1-3)
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pkgrel=2
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epoch=1
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arch=(aarch64 x86_64)
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url='https://kde.org/plasma-desktop/'
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license=(LGPL-2.0-or-later)
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depends=(aurorae
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breeze
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gcc-libs
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glibc
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iio-sensor-proxy
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plasma-activities
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kauth
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kcmutils
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kcolorscheme
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kconfig
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kcoreaddons
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kcrash
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kdbusaddons
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kdeclarative
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kdecoration
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kglobalaccel
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kglobalacceld
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kguiaddons
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ki18n
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kidletime
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kirigami
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kitemmodels
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knewstuff
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knighttime
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knotifications
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kpackage
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kquickcharts
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kscreenlocker
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kservice
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ksvg
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kwayland
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kwidgetsaddons
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kwindowsystem
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kxmlgui
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lcms2
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libcanberra
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libdisplay-info
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libdrm
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libei
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libepoxy
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libevdev
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libinput
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libpipewire
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libqaccessibilityclient-qt6
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libxcb
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libxcvt
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libxkbcommon
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mesa
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milou
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pipewire-session-manager
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libplasma
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qt6-5compat
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qt6-base
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qt6-declarative
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qt6-svg
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qt6-tools
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systemd-libs
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wayland
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xcb-util-keysyms
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xcb-util-wm)
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makedepends=(extra-cmake-modules
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kdoctools
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krunner
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plasma-wayland-protocols
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python
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wayland-protocols
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xorg-xwayland)
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optdepends=('plasma-keyboard: virtual keyboard')
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groups=(plasma)
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source=(https://download.kde.org/stable/plasma/$_dirver/$pkgname-$pkgver.tar.xz{,.sig}
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0001-transaction-bypass-watchDmaBuf-fence-wait.patch)
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sha256sums=('3f9439760580a977d018daf4b35b62e5a1700def7b21c8dfbfc789d21378d7ad'
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'SKIP'
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'SKIP')
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validpgpkeys=('E0A3EB202F8E57528E13E72FD7574483BB57B18D' # Jonathan Esk-Riddell <jr@jriddell.org>
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'0AAC775BB6437A8D9AF7A3ACFE0784117FBCE11D' # Bhushan Shah <bshah@kde.org>
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'D07BD8662C56CB291B316EB2F5675605C74E02CF' # David Edmundson <davidedmundson@kde.org>
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'90A968ACA84537CC27B99EAF2C8DF587A6D4AAC1' # Nicolas Fella <nicolas.fella@kde.org>
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'1FA881591C26B276D7A5518EEAAF29B42A678C20') # Marco Martin <notmart@gmail.com>
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prepare() {
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patch -d $pkgname-$pkgver -p1 < 0001-transaction-bypass-watchDmaBuf-fence-wait.patch
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}
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build() {
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cmake -B build -S $pkgname-$pkgver \
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-DCMAKE_INSTALL_LIBEXECDIR=lib \
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-DBUILD_TESTING=OFF
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cmake --build build
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}
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package() {
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DESTDIR="$pkgdir" cmake --install build
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setcap CAP_SYS_NICE=+ep "$pkgdir"/usr/bin/kwin_wayland
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}
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