From 23238b175a69d99c4a3c13496ccb75b5745b597c Mon Sep 17 00:00:00 2001
From: Xaver Hugl <xaver.hugl@gmail.com>
Date: Tue, 12 Sep 2023 13:41:49 +0200
Subject: [PATCH] backends/drm: fix the hardware cursor with atomic modesetting
 + no modifier support

Unless we have explicit information of the opposite, buffers for the cursor need to be linear
---
 src/backends/drm/drm_plane.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/backends/drm/drm_plane.cpp b/src/backends/drm/drm_plane.cpp
index 99da63b40c..4e211a8562 100644
--- a/src/backends/drm/drm_plane.cpp
+++ b/src/backends/drm/drm_plane.cpp
@@ -95,7 +95,8 @@ bool DrmPlane::updateProperties()
             m_supportedFormats[iterator.fmt].push_back(iterator.mod);
         }
     } else {
-        const QVector<uint64_t> modifiers = {DRM_FORMAT_MOD_INVALID};
+        // if we don't have modifier support, assume the cursor needs a linear buffer
+        const QVector<uint64_t> modifiers = {type.enumValue() == TypeIndex::Cursor ? DRM_FORMAT_MOD_LINEAR : DRM_FORMAT_MOD_INVALID};
         for (uint32_t i = 0; i < p->count_formats; i++) {
             m_supportedFormats.insert(p->formats[i], modifiers);
         }