diff --git a/control/lti.py b/control/lti.py
index cccb44a63..e631a6213 100644
--- a/control/lti.py
+++ b/control/lti.py
@@ -120,7 +120,8 @@ def frequency_response(self, omega=None, squeeze=None):
response = self(s)
return FrequencyResponseData(
response, omega, return_magphase=True, squeeze=squeeze,
- dt=self.dt, sysname=self.name, plot_type='bode')
+ dt=self.dt, sysname=self.name, inputs=self.input_labels,
+ outputs=self.output_labels, plot_type='bode')
def dcgain(self):
"""Return the zero-frequency gain"""
diff --git a/control/nlsys.py b/control/nlsys.py
index c154c0818..8ccd49515 100644
--- a/control/nlsys.py
+++ b/control/nlsys.py
@@ -1746,9 +1746,9 @@ def find_eqpt(sys, x0, u0=None, y0=None, t=0, params=None,
# Make sure the input arguments match the sizes of the system
if len(x0) != nstates or \
- (u0 is not None and len(u0) != ninputs) or \
- (y0 is not None and len(y0) != noutputs) or \
- (dx0 is not None and len(dx0) != nstates):
+ (u0 is not None and iu is None and len(u0) != ninputs) or \
+ (y0 is not None and iy is None and len(y0) != noutputs) or \
+ (dx0 is not None and idx is None and len(dx0) != nstates):
raise ValueError("length of input arguments does not match system")
# Update the parameter values
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