For more options and information see
http://www.raspberrypi.org/documentation/configuration/config-txt.md
Some settings may impact device functionality. See link above for details
uncomment if you get no picture on HDMI for a default "safe" mode
#hdmi_safe=1

uncomment this if your display has a black border of unused pixels visible
and your display can output without overscan
#disable_overscan=1

uncomment the following to adjust overscan. Use positive numbers if console
goes off screen, and negative if there is too much border
#overscan_left=16
#overscan_right=16
#overscan_top=16
#overscan_bottom=16

uncomment to force a console size. By default it will be display's size minus
overscan.
#framebuffer_width=1280
#framebuffer_height=960

uncomment if hdmi display is not detected and composite is being output
hdmi_force_hotplug=1

uncomment to force a specific HDMI mode (this will force VGA)
hdmi_group=2
hdmi_mode=35

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=4

uncomment for composite PAL
#sdtv_mode=2

#uncomment to overclock the arm. 700 MHz is the default.
#arm_freq=800

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
gpu_mem_256=128
gpu_mem_512=256
gpu_mem_1024=256
overscan_scale=1
disable_audio_dither=1
audio_pwm_mode=2
hdmi_force_edid_audio=1