Raspberry Pi 4 Resolution Change

Pocketsven

Hi there,
i try to change the resolution from 4k to full HD but it don't work.
retropi does not run very smoothly.
This is my config:

# 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=1
#hdmi_mode=16

# 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 infrared communication.
#dtoverlay=gpio-ir,gpio_pin=17
#dtoverlay=gpio-ir-tx,gpio_pin=18

# Additional overlays and parameters are documented /boot/overlays/README

# Enable audio (loads snd_bcm2835)
dtparam=audio=on

[pi4]
# Enable DRM VC4 V3D driver on top of the dispmanx display stack
dtoverlay=vc4-fkms-v3d
max_framebuffers=2

[all]
#dtoverlay=vc4-fkms-v3d
overscan_scale=1

Can someone help?

mitu

Un-comment the lines that set the resolution to 1080p then reboot.

hdmi_group=1
hdmi_mode=16

Pocketsven

@mitu Thank you.Worked

Stuffu

@mitu said in Raspberry Pi 4 Resolution Change:

Un-comment the lines that set the resolution to 1080p then reboot.
hdmi_group=1
hdmi_mode=16

Is this preferred over hdmi_ignore_edid=0xa5000080? What’s the difference?

mitu

@Stuffu said in Raspberry Pi 4 Resolution Change:

Is this preferred over hdmi_ignore_edid=0xa5000080?

Yes.

What’s the difference?

hdmi_ignore_edid should be used when the desired video mode is not correctly reported by the display and it's not on the list of supported modes.
You can use it in conjunction with other the video mode settings to set your desired resolution, but for a 4k display it would be a bit unusual to not support 1080p, so there's no reason to force the EDID to be ignored.

Stuffu

@mitu said in Raspberry Pi 4 Resolution Change:

@Stuffu said in Raspberry Pi 4 Resolution Change:

Is this preferred over hdmi_ignore_edid=0xa5000080?

Yes.

What’s the difference?

hdmi_ignore_edid should be used when the desired video mode is not correctly reported by the display and it's not on the list of supported modes.
You can use it in conjunction with other the video mode settings to set your desired resolution, but for a 4k display it would be a bit unusual to not support 1080p, so there's no reason to force the EDID to be ignored.

you learn something new every day :)

ctumbles

After those two lines are uncommented is there something in Retroarch that needs to be configured as well? I made the change and it does change Emulationstation to 1080p. However when running any games they all still try to run at what appears to be 4k. All I can see is the top left quarter of the game taking up the whole screen.

I tried to change the render resolution for all cores to 1920x1080 in configuration but that didn't seem to change anything. The only way the games appear correctly is by running them at 4k.

mitu

@ctumbles said in Raspberry Pi 4 Resolution Change:

After those two lines are uncommented is there something in Retroarch that needs to be configured as well?

Normally RetroArch's settings should not have the resolution hardcoded, RetroPie doesn't configure it that way. If you manually modified the resolution or used the RGUI to set it (and saved it afterwards), that might happen.

dankcushions

@ctumbles please provide all the info requested in https://retropie.org.uk/forum/topic/3/read-this-first including a verbose log

ctumbles

@dankcushions Here is the setup info:

Pi Model or other hardware: PI 4b
Power Supply used: usb C charger
RetroPie Version Used (eg 3.6, 3.8.1, 4.1 - do not write latest): 4.7.1
Built From: Pre made SD Image on RetroPie website
USB Devices connected: USB snes controller
Controller used: 8bitdo and USB snes
Error messages received: none
Verbose log (if relevant): n/a
Guide used: this post
File: n/a
Emulator: n/a, all
Attachment of config files: n/a
How to replicate the problem:

Update /boot/config.txt with

hdmi_group=1
hdmi_mode=16

This sets emulationstation to 1080p 60. However games running in retroarch still run at 4k 30. Is there a way to adjust the resolution in retroarch to 1080p 60? When I attempted to change in configuration for all cores the emulators don't display correctly. They just display the top left corner of the game in the entire tv screen. The other 3/4 of the screen is missing.

mitu

@ctumbles said in Raspberry Pi 4 Resolution Change:

This sets emulationstation to 1080p 60. However games running in retroarch still run at 4k 30

Did you use the 'Save Configuration' from RetroArch's menus ? Did you use the Runcommand launch menu to set the resolution ?

ctumbles

@mitu I went to Retropie > Configuration Editor > Configure basic libretro emulation options > Configure default options for all libretro emulators > Render resolution.

Is there a better place to change the resolution for Retroarch?

qbone

Sorry to stumble in on this post, but I believe my question is in the same line as OP. I have an old monitor and tried connecting my freshly installed RetroPie on Rpi4 to it. It is connected through a HDMI to VGA adapter, so the Rpi will most likely not recognize the display. The issue I experienced was baad flickering and display turning on and off. I believe the max resolution of the monitor is 1280x1024.
Is it just the same two lines I need to uncomment?

hdmi_group=1
hdmi_mode=16

mitu

@qbone said in Raspberry Pi 4 Resolution Change:

Is it just the same two lines I need to uncomment?

Those lines set-up the display for 1080p, which your monitor will not support (not sure if VGA can even go up to 1080p).
Have you tried using raspi-config to set-up your resolution ?
You can also try

hdmi_group=2
hdmi_mode=35

which, according to the docs, should match your resolution.

qbone

@mitu ah, wonderful! I will give it a shot. Thanks for the swift reply :)