fix: verify work during continuously hidden guest intervals

hydra/profiles.py

@@ -40,8 +40,9 @@ class Profile:
         for key in ('width', 'height'):
             if type(getattr(self, key)) is not int or not 1 <= getattr(self, key) <= 16384:
                 raise ValueError(f'{key} must be an integer between 1 and 16384')
-        if type(self.refresh_millihz) is not int or not 0 <= self.refresh_millihz <= 1000000:
-            raise ValueError('refresh_millihz must be an integer between 0 and 1000000')
+        if type(self.refresh_millihz) is not int or not (self.refresh_millihz == 0 or
+                                                       50000 <= self.refresh_millihz <= 255000):
+            raise ValueError('refresh_millihz must be 0 (automatic) or an integer between 50000 and 255000')
         if not isinstance(self.disk_size, str) or not re.fullmatch(r'[1-9][0-9]{0,5}[MGT]', self.disk_size):
             raise ValueError('disk_size must be a positive size with M, G or T suffix')
         if self.graphics not in ('auto', 'software'):