  The first Large Size Telescope (LST-1) of the Cherenkov Telescope Array has
been operational since October 2018 at La Palma, Spain. We report on the
results obtained during the camera commissioning. The noise level of the
readout is determined as a 0.2 p.e. level. The gain of PMTs are well equalized
within 2\% variation, using the calibration flash system. The effect of the
night sky background on the signal readout noise as well as the PMT gain
estimation are also well evaluated. Trigger thresholds are optimized for the
lowest possible gamma-ray energy threshold and the trigger distribution
synchronization has been achieved within 1~ns precision. Automatic rate control
realizes the stable observation with 1.5\% rate variation over 3 hours. The
performance of the novel DAQ system demonstrates a less than 10\% dead time for
15 kHz trigger rate even with sophisticated online data correction.
