kmstest: add help text about env variables

diff --git a/utils/kmstest.cpp b/utils/kmstest.cpp
index 34fb35217a66aadfd94f6df03e9664cb87a20333..f9486a4da4871320357f2711a996f1f2c05dbe0d 100644 (file)
--- a/utils/kmstest.cpp
+++ b/utils/kmstest.cpp
@@ -381,6 +381,10 @@ static const char* usage_str =
                "    kmstest -p 400x400 -f XR24\n\n"
                "Test pattern on the second connector with default mode:\n"
                "    kmstest -c 1\n"
+               "\n"
+               "Environmental variables:\n"
+               "    KMSXX_DISABLE_UNIVERSAL_PLANES    Don't enable universal planes even if available\n"
+               "    KMSXX_DISABLE_ATOMIC              Don't enable atomic modesetting even if available\n"
                ;
 
 static void usage()