[make-initrd] [PATCH 1/2] plymouth: fix plymouth showing when drm is not ready yet

[antohami@basealt.ru]

From: Anton Midyukov <antohami@altlinux.org>

Fix waiting for a real video card when simpledrm is available.
card0 will disappear when the DRM module of the real video card is
loaded. Because of this, by the time Plymouth was shown, simpledrm
was no longer there, and there was no real video card yet.

Instead of waiting for devices to appear, is proposed to launch
triggers for subsystems, as is uses in dracut.

Signed-off-by: Anton Midyukov <antohami@altlinux.org>
---
 features/plymouth/data/etc/rc.d/init.d/plymouth | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/features/plymouth/data/etc/rc.d/init.d/plymouth b/features/plymouth/data/etc/rc.d/init.d/plymouth
index 20d64011..27d91876 100755
--- a/features/plymouth/data/etc/rc.d/init.d/plymouth
+++ b/features/plymouth/data/etc/rc.d/init.d/plymouth
@@ -19,8 +19,17 @@ start() {
 	[ -z "${NOSPLASH-}" ] && [ -z "${RDSHELL-}" ] ||
 		return 0
 
-	udevadm settle --timeout=30 --exit-if-exists=/sys/class/drm/card0/dev
-	udevadm settle --timeout=30 --exit-if-exists=/sys/class/graphics/fb0/dev
+	# first trigger graphics subsystem
+	udevadm trigger --action=add --attr-match=class=0x030000 > /dev/null 2>&1
+	# first trigger graphics and tty subsystem
+	udevadm trigger --action=add \
+		--subsystem-match=graphics \
+		--subsystem-match=drm \
+		--subsystem-match=tty \
+		--subsystem-match=acpi \
+		> /dev/null 2>&1
+
+	udevadm settle --timeout=60 2>&1
 
 	local pidfile=/run/plymouth/pid
 
-- 
2.42.1