diff --git a/src/utils.c b/src/utils.c
index d37eeee..e5a4639 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -33,10 +33,24 @@
 void request_log(const char *format, ...)
 {
 	va_list arguments;
+	static FILE *trace_fp;
 
 	fprintf(stderr, "%s: ", V4L2_REQUEST_STR_VENDOR);
 
 	va_start(arguments, format);
 	vfprintf(stderr, format, arguments);
 	va_end(arguments);
+
+	/* Fourier-local: also tee to /tmp/libva-fourier.log so messages are
+	 * visible from sandboxed GPU processes (Chromium etc.) where stderr
+	 * is redirected. Append-mode, lazy-open. */
+	if (trace_fp == NULL)
+		trace_fp = fopen("/tmp/libva-fourier.log", "a");
+	if (trace_fp != NULL) {
+		fprintf(trace_fp, "%s: ", V4L2_REQUEST_STR_VENDOR);
+		va_start(arguments, format);
+		vfprintf(trace_fp, format, arguments);
+		va_end(arguments);
+		fflush(trace_fp);
+	}
 }