Show warning for missing capability

2 files changed, 7 insertions, 1 deletions

diff --git a/dbus/client/dbus_client.h b/dbus/client/dbus_client.h
index c9e8182..98a1ecf 100644
--- a/dbus/client/dbus_client.h
+++ b/dbus/client/dbus_client.h
@@ -2,7 +2,7 @@
 #define GSR_DBUS_CLIENT_H
 
 /*
-    Using a client-server architecture is needed for dbus because cap_sys_nice doesn't work with desktop portal.
+    Using a client-server architecture is needed for dbus because cap_sys_nice breaks desktop portal.
     The main binary has cap_sys_nice and we launch a new child-process without it which uses uses desktop portal.
 */
 
diff --git a/src/egl.c b/src/egl.c
index 8e38589..dd84325 100644
--- a/src/egl.c
+++ b/src/egl.c
@@ -39,6 +39,12 @@ static void reset_cap_nice(void) {
     if(!caps)
         return;
 
+    cap_flag_value_t cap_sys_nice_value = CAP_CLEAR;
+    cap_get_flag(caps, CAP_SYS_NICE, CAP_EFFECTIVE, &cap_sys_nice_value);
+    if(cap_sys_nice_value == CAP_CLEAR) {
+        fprintf(stderr, "gsr warning: cap_sys_nice capability is missing on the gpu-screen-recorder binary, performance might be affected. If you are using the flatpak version of gpu-screen-recorder then the only fix is to use a non-flatpak version of gpu-screen-recorder\n");
+    }
+
     const cap_value_t cap_to_remove = CAP_SYS_NICE;
     cap_set_flag(caps, CAP_EFFECTIVE, 1, &cap_to_remove, CAP_CLEAR);
     cap_set_flag(caps, CAP_PERMITTED, 1, &cap_to_remove, CAP_CLEAR);