HDMI to VGA Video Adapter and 3.5mm Male/Male Stereo Cable

• Adapter body: 57mm x 40mm x 17mm
• Cable tail: 6" / 150mm long
• Standard HDMI plug
• Standard DB15 VGA socket

Here's Adafruit's known-good /boot/config.txt which will set the resolution to 800x600 and enable the audio out of the adapter. Adafruit have a couple other resolution options documented as well!

# 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=720 # 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=87 # Put your VGA monitor resolution below # hdmi_cvt =        # width width in pixels # height height in pixels # framerate framerate in Hz # aspect aspect ratio 1=4:3, 2=14:9, 3=16:9, 4=5:4, 5=16:10, 6=15:9 # margins 0=margins disabled, 1=margins enabled # interlace 0=progressive, 1=interlaced # rb 0=normal, 1=reduced blanking # For example, 800x600 @ 60 Hz hdmi_cvt=800 600 60 1 0 0 1 # or maybe 800x480 @ 60 Hz #hdmi_cvt=800 480 60 6 0 0 1 # or, 1024 x 768 @ 50 Hz #hdmi_cvt=1024 768 60 1 0 0 1 # or if you're not sure, nothing beats 640x480 #hdmi_cvt=640 460 60 1 0 0 1 # see http://www.raspberrypi.org/forum/viewtopic.php?f=29&t=24679 # uncomment to force a HDMI mode rather than DVI. This can make audio work in # DMT (computer monitor) modes ############################################################### ### THIS LINE IS WHAT ENABLES THE AUDIO OUT OF THE ADAPTER! ### 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 # for more options see http://elinux.org/RPi_config.txt