diff --git a/MobileGL/MG_Benchmark/Driver/CMakeLists.txt b/MobileGL/MG_Benchmark/Driver/CMakeLists.txt
index caad1a3d..5144f0c9 100644
--- a/MobileGL/MG_Benchmark/Driver/CMakeLists.txt
+++ b/MobileGL/MG_Benchmark/Driver/CMakeLists.txt
@@ -11,8 +11,29 @@ endif()
 add_executable(DriverBench DriverBench.c)
 target_link_libraries(DriverBench PRIVATE dl)
 
+# WHY EVERY ENTRY HERE CARRIES A PASS_REGULAR_EXPRESSION.
+#
+# DriverBench prints one CSV row per case it ran and exits 0 whatever it ran. Before this, a ctest
+# entry naming a case therefore could not answer the only question it exists to ask: an argument
+# matching nothing in kBenchCases selected no case, printed only the header row, and still exited
+# 0. DriverBench.c now refuses an unknown case name (exit 2), which closes it at the source - but
+# the entry must be able to go red for the reason it exists WITHOUT depending on that check
+# staying in the binary, so each entry also requires the case's own output row to appear.
+#
+# The regex is what a healthy run of that case prints and nothing else does: the case name at the
+# start of a line, then the frames / ops-per-frame / median-ms / ns-per-op / fps columns
+# (run_case()). A rename, a drop from kBenchCases, a boot_egl() failure or
+# a crash part-way through the case all remove that row and turn the entry red.
+#
+# Note that a PASS_REGULAR_EXPRESSION makes ctest ignore the process exit code (cmCTestRunTest:
+# success is `retVal == 0 || !RequiredRegularExpressions.empty()`), which is why the row itself
+# has to be the evidence rather than a companion to the rc.
 add_test(NAME DriverBench COMMAND DriverBench draw_tiny)
-set_tests_properties(DriverBench PROPERTIES LABELS benchmark)
+# draw_tiny's a/ops scale with $DRIVERBENCH_DRAWS (main()), so only the shape of
+# the row is pinned here, not the column values.
+set_tests_properties(DriverBench PROPERTIES
+    LABELS benchmark
+    PASS_REGULAR_EXPRESSION "(^|\n)draw_tiny,[0-9]+,[0-9]+,[0-9.]+,[0-9.]+,[0-9.]+")
 
 # The Blaze3D blend toggle, as its own entry.
 #
@@ -31,4 +52,10 @@ set_tests_properties(DriverBench PROPERTIES LABELS benchmark)
 # when unset) - the ctest entry is a "does this case still run" gate, not the measurement. The
 # measurement is run_driver_bench.sh against each of {native, espryt, magma}.
 add_test(NAME DriverBenchStateToggle COMMAND DriverBench mc_state_toggle)
-set_tests_properties(DriverBenchStateToggle PROPERTIES LABELS benchmark)
+# The ops-per-frame column is pinned to 46 here, unlike the entry above: the mc_* cases are
+# excluded from the $DRIVERBENCH_DRAWS scaling on purpose ("the mc_* rates are measured and must
+# not move, or the numbers stop being comparable", main()), so 46 toggles per frame
+# is part of what "this case still runs" means. Change the workload and this entry says so.
+set_tests_properties(DriverBenchStateToggle PROPERTIES
+    LABELS benchmark
+    PASS_REGULAR_EXPRESSION "(^|\n)mc_state_toggle,[0-9]+,46,[0-9.]+,[0-9.]+,[0-9.]+")
diff --git a/MobileGL/MG_Benchmark/Driver/DriverBench.c b/MobileGL/MG_Benchmark/Driver/DriverBench.c
index 6f966794..8eb20db7 100644
--- a/MobileGL/MG_Benchmark/Driver/DriverBench.c
+++ b/MobileGL/MG_Benchmark/Driver/DriverBench.c
@@ -476,6 +476,28 @@ int main(int argc, char** argv) {
     if (getenv("DRIVERBENCH_FRAMES")) g_frames = atoi(getenv("DRIVERBENCH_FRAMES"));
     if (getenv("DRIVERBENCH_SPRITES")) g_mixSprites = atol(getenv("DRIVERBENCH_SPRITES"));
 
+    /* A requested case name that matches nothing used to select nothing, print the header row and
+     * exit 0 - so a caller that names a case (run_driver_bench.sh, and the two ctest entries in
+     * CMakeLists.txt) could not tell "the case ran" from "the case has been renamed or deleted".
+     * Refuse it here, before any GL work, so the refusal reaches a caller that has no display
+     * either, and name what does exist so the fix is obvious. */
+    int unknownCases = 0;
+    for (int j = 1; j < argc; ++j) {
+        int known = 0;
+        for (int i = 0; i < kBenchCaseCount; ++i)
+            if (strcmp(argv[j], kBenchCases[i].name) == 0) known = 1;
+        if (!known) {
+            fprintf(stderr, "DriverBench: no case named '%s'\n", argv[j]);
+            unknownCases = 1;
+        }
+    }
+    if (unknownCases) {
+        fprintf(stderr, "DriverBench: the %d cases in kBenchCases are:\n", kBenchCaseCount);
+        for (int i = 0; i < kBenchCaseCount; ++i)
+            fprintf(stderr, "  %s\n", kBenchCases[i].name);
+        return 2;
+    }
+
     if (boot_egl()) return 1;
     build_resources();