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Pi custom resolution

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TheOnlyShad0w:
I'm having trouble figuring out how to set a custom resolution for my Pi running Emulation Station. I'm using a 720p 16:9 TV and my intention is to have it oriented in portrait in my cabinet so my arcade games fill as much space as possible.

I was able to set the screen rotation in my config.txt which rotated it 90 degrees, great. Now I just need to set the resolution to 960x720 (960 tall by 720 wide) so I'm able to create a frame around the unused space on the screen. Is anyone aware of how to do this?

Also, as soon as I changed the display rotation I noticed a very odd ripple going on. I can see it in emulation station as well as in-game. It's only a single ripple and appears to cross diagonal from top to bottom crossing the about a quarter into the left of the display. . You'll have to look really close to see it in the video. I added an annotation to hopefully help you see the location of the ripple. I'm hoping someone can help me resolve this as well.

Slippyblade:
That looks like, to me at least, an LCD backlight problem.

TheOnlyShad0w:

--- Quote from: Slippyblade on February 07, 2016, 02:35:03 am ---That looks like, to me at least, an LCD backlight problem.

--- End quote ---
Interesting. My TV is brand new and I don't get this problem when running the monitor in regular landscape mode. I'll try running in portrait on a different TV and see if I get the same outcome.

MacGyver:
Your screen might not support that exact resolution. 

Here is a link with just about everything you need to set custom resolutions on your Pi.
https://www.raspberrypi.org/documentation/configuration/config-txt.md

You might have to get it close, and then play with the overscan to eliminate the black bars.  (mine ended up needing to be about -30 all around in config.txt.)

I did see a page once with references to very custom resolutions, but in the end your TV is the deciding factor.  The pi is great for letting you set it how you like.


--- Quote ---Enter the following command to give a list of CEA supported modes:
/opt/vc/bin/tvservice -m CEA

Enter the following command to give a list of DMT supported modes:
/opt/vc/bin/tvservice -m DMT

--- End quote ---

Mine currently uses:

--- Code: ---hdmi_group=2
hdmi_mode=87
hdmi_cvt=800 480 60 6 0 0 0
display_rotate=1
--- End code ---

hdmi_mode=87    <---custom mode

hdmi_cvt=<width> <height> <framerate> <aspect> <margins> <interlace> <rb>
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, 7=21:9, 8=64:27
margins      0=margins disabled, 1=margins enabled
interlace    0=progressive, 1=interlaced
rb           0=normal, 1=reduced blanking


You can also dig deeper and set the timings

--- Code: ---hdmi_timings=<h_active_pixels> <h_sync_polarity <h_front_porch> <h_sync_pulse> <h_back_porch> <v_active_lines> <v_sync_polarity> <v_front_porch> <v_sync_pulse> <v_back_porch> <v_sync_offset_a> <v_sync_offset_b> <pixel_rep> <frame_rate> <interlaced> <pixel_freq> <aspect_ratio>
--- End code ---

This link goes a little deeper:http://elinux.org/RPiconfig

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