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From 3b9c7376c22816e9adae936f6831b1255aa5aae7 Mon Sep 17 00:00:00 2001
From: Alessandro Astone <alessandro.astone@canonical.com>
Date: Wed, 26 Nov 2025 16:07:00 +0100
Subject: [PATCH] gdm-session-worker: Set XDG_SESSION_EXTRA_DEVICE_ACCESS
Graphical-remote sessions may not have access to GPU rendering nodes
because
that is usually associated with a seat. Some distributions set
permission 666
on render nodes, while others like Debian and Ubuntu prefer not to.
XDG_SESSION_EXTRA_DEVICE_ACCESS is being introduced in systemd to
support
the use-case of granting sessions extra device access.
Set XDG_SESSION_EXTRA_DEVICE_ACCESS=render to gain access to DRM render
nodes
tagged as `xaccess-render` in udev.
Also set XDG_SESSION_EXTRA_DEVICE_ACCESS=accel to gain acces to NPU
nodes
tagged as `xaccess-accel` in uev.
This also applies to physical sessions where the user will now retain
access
to these devices even after the session goes in the background.
* https://github.com/systemd/systemd/pull/38516
* https://github.com/systemd/systemd/pull/40645
Closes: https://gitlab.gnome.org/GNOME/gnome-remote-desktop/-/issues/224
---
daemon/gdm-session-worker.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/daemon/gdm-session-worker.c b/daemon/gdm-session-worker.c
index fc49ba2ba..ac6bf69e3 100644
--- a/daemon/gdm-session-worker.c
+++ b/daemon/gdm-session-worker.c
@@ -1242,6 +1242,9 @@ gdm_session_worker_initialize_pam (GdmSessionWorker *worker,
}
}
+ /* Grant extra access to GPUs and NPUs (i.e. for remote sessions without a seat) */
+ gdm_session_worker_set_environment_variable (worker, "XDG_SESSION_EXTRA_DEVICE_ACCESS", "render:accel");
+
/* set seat ID */
if (seat_id != NULL && seat_id[0] != '\0') {
gdm_session_worker_set_environment_variable (worker, "XDG_SEAT", seat_id);
--
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