Voila mon config.txt

Je me posais la question pour le # de la première ligne vis a vis du HDMI et pour le avoid_safe_mode=1 ?

uncomment if you get no picture on HDMI for a default "safe" mode
#hdmi_safe=1

disable_overscan=1

uncomment to force a specific HDMI mode (this will force VGA)
#hdmi_group=1
#hdmi_mode=1

comment to get jack audio
hdmi_drive=2

Using /etc/modules is deprecated and no longer supported on 4.4 kernel
So manually enable audio
dtparam=audio=on

config_hdmi_boost=0

force hdmi while the tv can take time before sending the signal on the hdmi output
hdmi_force_hotplug=1

uncomment for composite PAL
#sdtv_mode=2

uncomment for lirc-rpi
#dtoverlay=lirc-rpi

if you plug your tv at the same time as your rpi and that the rpi switches from the hdmi or give a low resolution >>because tv had no enough time to initialize it
boot_delay=3

uncomment if you don't want the rainbow at startup
disable_splash=1

default CEC name
cec_osd_name=recalbox

Overclock
gpu_mem_256=128
gpu_mem_512=256
gpu_mem_1024=512

avoid_safe_mode=1

kernel=zImage
arm_freq=1350
core_freq=500
sdram_freq=575
force_turbo=0
over_voltage=4
over_voltage_sdram_p=6
over_voltage_sdram_i=4
over_voltage_sdram_c=4
gpu_freq=500
sdram_schmoo=0x02000020