diff --git a/Core/HLE/sceDisplay.cpp b/Core/HLE/sceDisplay.cpp
index d657610979..49a78a14b6 100644
--- a/Core/HLE/sceDisplay.cpp
+++ b/Core/HLE/sceDisplay.cpp
@@ -135,8 +135,10 @@ std::map<SceUID, int> vblankPausedWaits;
 
 // STATE END
 
-// The vblank period is 731.5 us (0.7315 ms)
-const double vblankMs = 0.7315;
+// tests/display/vblanklen measures 730-770us from sceDisplayWaitVblankStart returning until
+// vblank ends, and an hcount of up to 14 inside it. The wait's own latency is in that, so this is
+// the upper end.
+const double vblankMs = 0.770;
 // These are guesses based on tests.
 const double vsyncStartMs = 0.5925;
 const double vsyncEndMs = 0.7265;
diff --git a/test.py b/test.py
index 0553541591..985ceacfb2 100755
--- a/test.py
+++ b/test.py
@@ -180,6 +180,7 @@ tests_good = [
   "ctrl/sampling2/sampling2",
   "ctrl/vblank",
   "display/display",
+  "display/hcount",
   "display/vblankmulti",
   "display/isstate",
   "display/setframebuf",
@@ -293,6 +294,7 @@ tests_good = [
   "mstick/mstick",
   "power/cpu",
   "power/power",
+  "power/freq",
   "power/volatile/lock",
   "power/volatile/trylock",
   "power/volatile/unlock",
@@ -532,7 +534,6 @@ tests_next = [
   "audio/output2/frequency",
   "audio/output2/rest",
   "ccc/convertstring",
-  "display/hcount",
   "font/fonttest",
   "font/charinfo",
   "font/newlib",
@@ -593,7 +594,6 @@ tests_next = [
   #"modules/loadexec/loader",
   "net/http/http",
   "net/primary/ether",
-  "power/freq",
   "sysmem/partition",
   # These two mbx tests only appeared to work because they papered over bugs