ok thank you. i have a raspberry pi 3 b v1.2
here is my config file
# For more options and information see
#
http://www.raspberrypi.org/documentatio ... fig-txt.md
# Some settings may impact device functionality. See link above for details
# disable Rpi rainbow splash
disable_splash=1
# to flip the image to account for monitor mounting
#display_rotate=2
# uncomment if you get no picture on HDMI for a default "safe" mode
#hdmi_safe=1
# make sure the pi outputs to correct scanlines without overscan
# use this even when playing with overscan settings for best results
# on CRT monitors always use this setting
disable_overscan=1
# uncomment the following to adjust overscan / picture position. Use positive
# numbers if console goes off screen, and negative if there is too much border
# also use overscan_scale so the emulators comply & still use disable_overscan
# do not adjust top and bottom or you will loose scanline perfect output although
# you can move the picture up or down evenly with okay-ish results better not to
overscan_scale=1
overscan_left=33
overscan_right=32
##overscan_top=4
##overscan_bottom=-4
# ignore edid - we just want video output to do as we say anyway
hdmi_ignore_edid=0xa5000080
# force hdmi output
hdmi_force_hotplug=1
# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes
hdmi_drive=2
# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
config_hdmi_boost=6
# use full spectrum RGB over HDMI
hdmi_pixel_encoding=2
## PLEASE NOTE: due to the resolution switching launcher scripts changes made
## in this section are at your own risk, 480i is correct for this build
## if you change settings here make sure to modify the launchers for each system
# uncomment to force a specific HDMI mode (this will force VGA) Group 1 (DMT)
# and Group 2 (CVT) behave slightly differently. You can only use one Group
# and Mode at a time. For Group 1 Mode 8 is 720x240, Mode 6 is 720x480i & Mode
# 1 is 640x480p. Group 2 allows custom settings using mode 87.
hdmi_group=1
hdmi_mode=6
### Group 1 custom modes (don't seem to work well, timings are very specific)
###hdmi_timings=640 0 16 16 34 480 0 21 1 22 0 0 0 60 1 327300000 1
###hdmi_mode=65
## CVT custom modes (works well but cannot do 480i)
#hdmi_cvt=720 240 60 1 0 0 0
#hdmi_group=2
#hdmi_mode=87
# Uncomment for composite PAL
#sdtv_mode=2
# Increase gpu mem for complex attract-mode themes to work properly
gpu_mem=256
#gpu_mem=128
# Uncomment to overclock RPi2
#arm_freq=1000
#sdram_freq=500
#core_freq=500
#over_voltage=2
#temp_limit=80 #Will throttle to default clock speed if hit.
# Experimental RPi3 overclocking - reported stable, you may want a heatsink
# the 1A fuse on a RaspberryJAMMA can be safely upgraded to a 2.5A fuse for RPi3
# and probably should be for overclocking
#arm_freq=1400
#over_voltage=4
#sdram_freq=500
#core_freq=500
#gpu_freq=400
#temp_limit=80 #Will throttle to default clock speed if hit.
# Uncomment some or all of these to enable the optional hardware interfaces
#dtparam=i2c_arm=on
#dtparam=i2s=on
#dtparam=spi=on
# Uncomment this to enable the lirc-rpi module
#dtoverlay=lirc-rpi
# Additional overlays and parameters are documented /boot/overlays/README
# Enable audio (loads snd_bcm2835)
dtparam=audio=on