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From 69f643f87db21db2820ead3efff8f08c712fa2dc Mon Sep 17 00:00:00 2001
From: Daniel Golle <daniel@makrotopia.org>
Date: Thu, 24 Sep 2026 22:43:44 +0100
Subject: [PATCH] drm: treat a node without resources as having no displays
A render-only drm node has neither crtcs nor connectors, and
drmModeGetResources returns NULL for it. The hotplug path logged that
as an error and returned -EACCES, and since it runs from the poll
handler the result was a tight error loop: on an rk3588, where panthor
takes card0 and the display controller card1, kmscon wrote 776 error
lines in eighty seconds while the console itself worked fine on card1.
Such a node simply has no displays to offer, so say so once at debug
level and carry on.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
src/video/drm_shared.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/src/video/drm_shared.c
+++ b/src/video/drm_shared.c
@@ -1462,8 +1462,10 @@ int drm_video_hotplug(struct video *vide
res = drmModeGetResources(vdrm->fd);
if (!res) {
- log_err("cannot retrieve drm resources");
- return -EACCES;
+ /* A render-only node carries no crtcs or connectors. */
+ log_debug("no drm resources on %s, no displays here",
+ vdrm->name);
+ return 0;
}
shl_dlist_for_each(iter, &video->displays)
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