hyprland-displaylink-git

displaylink.patch

diff --git a/render/egl.c b/render/egl.c
index 8a1e6dae..d0e6adb6 100644
--- a/render/egl.c
+++ b/render/egl.c
@@ -508,8 +508,43 @@ static int open_render_node(int drm_fd) {
 		}
 		wlr_log(WLR_DEBUG, "DRM device '%s' has no render node, "
 			"falling back to primary node", render_name);
+
+		drmVersion *render_version = drmGetVersion(drm_fd);
+		if (render_version != NULL && render_version->name != NULL) {
+			wlr_log(WLR_DEBUG, "DRM device version.name '%s'", render_version->name);
+			if (strcmp(render_version->name, "evdi") == 0) {
+				free(render_name);
+
+				uint32_t flags = 0;
+				const int devices_len = drmGetDevices2(flags, NULL, 0);
+				if (devices_len < 0) {
+					wlr_log(WLR_ERROR, "drmGetDevices2 failed: %s", strerror(-devices_len));
+					return -1;
+				}
+
+				const char *render_devices[] = {
+					"/dev/dri/card0",
+					"/dev/dri/card1",
+					"/dev/dri/card2",
+					"/dev/dri/card3",
+					"/dev/dri/card4",
+					"/dev/dri/card5",
+					"/dev/dri/card6",
+					"/dev/dri/card7",
+					"/dev/dri/card8",
+					"/dev/dri/card9",
+					NULL
+				};
+
+				render_name = malloc(sizeof(char)*15);
+				render_name = strcpy(render_name, render_devices[env_parse_switch("WLR_EVDI_RENDER_DEVICE", render_devices)]);
+			}
+			drmFreeVersion(render_version);
+		}
 	}

+	wlr_log(WLR_DEBUG, "open_render_node() DRM device '%s'", render_name);
+
 	int render_fd = open(render_name, O_RDWR | O_CLOEXEC);
 	if (render_fd < 0) {
 		wlr_log_errno(WLR_ERROR, "Failed to open DRM node '%s'", render_name);

PKGBUILD

# Maintainer: Clément POIRET <poiret dot clement at outlook dot fr>

_pkgname="hyprland"
pkgname="${_pkgname}-displaylink-git"
pkgver="0.38.1"
pkgrel=1
pkgdesc="A dynamic tiling Wayland compositor based on wlroots that doesn't sacrifice on its looks. (DisplayLink patch)"
arch=(any)
url="https://github.com/hyprwm/Hyprland"
license=('BSD')
depends=(
  cairo
  gcc-libs
  glib2
  glibc
  glslang
  hyprlang
  hyprcursor
  libdisplay-info
  libdrm
  libglvnd
  libinput
  libliftoff
  libx11
  libxcb
  libxcomposite
  libxfixes
  libxkbcommon
  libxrender
  opengl-driver
  pango
  pixman
  polkit
  seatd
  systemd-libs
  tomlplusplus
  wayland
  wayland-protocols
  xcb-proto
  xcb-util
  xcb-util-errors
  xcb-util-keysyms
  xcb-util-renderutil
  xcb-util-wm
  xorg-xinput
  xorg-xwayland
)
depends+=(libdisplay-info.so)
makedepends=(
  cmake
  gdb
  git
  jq
  meson
  ninja
  pkgconf
  xorgproto
)
source=(
  "${pkgname}-${pkgver}.tar.gz::https://github.com/hyprwm/Hyprland/releases/download/v${pkgver}/source-v${pkgver}.tar.gz"
  "displaylink.patch"
  )
conflicts=("${_pkgname}")
provides=(hyprland)
sha256sums=('1a86365cc006fca4bc96c6c41347d0bde048b6463c516e09b9c54cff58fb73ab'
            '70c8f6af41ed252c2cee7b1fc0b29ff29c7f81932a9dd3014716571b0728e5ab')
options=(!makeflags !buildflags !strip)

prepare() {
    cd "$srcdir/hyprland-source"
    patch -d subprojects/wlroots -Np1 < ../displaylink.patch
}

build() {
    cd "$srcdir/hyprland-source"

    meson setup build \
        --prefix     /usr \
        --libexecdir lib \
        --sbindir    bin \
        --buildtype  release \
        --wrap-mode  nodownload \
        -D           b_lto=true \
        -D           b_pie=true \
        -D           default_library=shared \
        -D           xwayland=enabled \
        -D           systemd=enabled

    meson compile -C build
}

package() {
  cd "$srcdir/hyprland-source"

  meson install -C build \
    --destdir "$pkgdir" \
    --skip-subprojects hyprland-protocols

  mkdir "$pkgdir/usr/include/hyprland/wlroots"
  mv "$pkgdir/usr/include/wlr" "$pkgdir/usr/include/hyprland/wlroots"

  # resolve conflicts with system wlr
  rm -f "$pkgdir/usr/lib/libwlroots.so"
  rm -rf "$pkgdir/usr/lib/pkgconfig"

  # FIXME: remove after xdg-desktop-portal-hyprland disowns hyprland-portals.conf

  rm -rf "$pkgdir/usr/share/xdg-desktop-portal"

  # license
  install -Dm0644 -t "$pkgdir/usr/share/licenses/${pkgname}" LICENSE
}

Okay, so now your hyprland setup works. I would say you may want to try few things:

1. instead of the evdi package, try evdi-git or evdi-compat,
2. try the same setup with and lts kernel,

Also, regularly nvidia drivers are breaking things. If you do not use your GPU, I'd suggest trying the nouveau driver. For my personal workflow, nouveau suits my needs on my laptop as I do not use CUDA and cuDNN on it. At least, if you try the nouveau driver and see that your screen is working, it means that's effectively an issue with nvidia, so you can try to temporarily downgrade your nvidia drivers. I got tired of nvidia breaking things randomly so I gave up and went the nouveau path :)

Already tried using evdi-git and using lts kernel , unfortunately my workflow relies heavily on CUDA so I cannot really live without it, I'm just gonna stick with x11 in the meanwhile, thanks for your work

Hopefully one day this patch will be merged into wlroots, let's cross our fingers :)