Raspberry PI4 video and audio problems

Alain De Vos · Dec 25, 2021

Raspberry PI4 has an internal audio card & is connected to a monitor with HDMI-audio, but gtk-mixer shows no audio device.
The monitor is badly detected but i could increase the resolution with the following in the boot config text file.

Code:

hdmi_safe=1
framebuffer_width=1280
framebuffer_height=1024
hdmi_force_hotplug=1

Still video output is "too heigh on the screen". There is room left over. It makes font rendering also ugly.
[ PS: Cfr. Using Raspberry O.S. video and audio show no problems ]
Any ideas for better video & audio are welcome.

Alain De Vos · Dec 26, 2021

I have much better hdmi video using config.txt below

Code:

[all]
device_tree_address=0x4000
kernel=u-boot.bin
arm_64bit=1
dtparam=audio=on,i2c_arm=on,spi=on
dtoverlay=mmc
dtoverlay=disable-bt
dtoverlay=vc4-kms-v3d
display_auto_detect=0
disable_overscan=1
max_framebuffers=2
framebuffer_width=1280
framebuffer_height=1024
camera_auto_detect=0
[cm4]
otg_mode=1
[pi4]
#hdmi_safe=1
armstub=armstub8-gic.bin
arm_boost=1

Audio remains a bummer.
[PS: Recent versions of netbsd should have audio non 64bit in the lower 1G. ]

eternal_noob · Dec 26, 2021

Audio only works on RPI 1 and RPI 2 at the moment.

Alain De Vos · Dec 26, 2021

An USB audio dongle could be a workaround.

eternal_noob · Dec 26, 2021

Yes. (If you can spare a USB port)

Alain De Vos · Dec 26, 2021

Using a 3 port USB hub. The Raspberry PI will start to look like LEGO. [Or Mac]

grahamperrin · Dec 28, 2021

Alain De Vos said:
HDMI-audio

Alain's aware of this already, for the benefit of other readers:

FreeBSD Foundation-supported projects: call for ideas, November 2021

Raspberry Pi 400 sound over HDMI

Is the 4 akin to the 400?

covacat · Dec 28, 2021

grahamperrin said:
Is the 4 akin to the 400?

4 and 400 is the same hardware

eternal_noob · Dec 28, 2021

covacat said:
4 and 400 is the same hardware

There are some subtle differences.
See https://all3dp.com/2/raspberry-pi-400-vs-raspberry-pi-4-differences/

Alain De Vos · Dec 29, 2021

grahamperrin said:
Alain's aware of this already, for the benefit of other readers:

FreeBSD Foundation-supported projects: call for ideas, November 2021

Is the 4 akin to the 400?

The cpu is fine. But i wonder the other choices they made.

Alain De Vos · Dec 29, 2021

As workaround i use currently a very cheap usb-audio dongle which works fine.

timmawhinney · Jun 7, 2022

Alain De Vos said:
I have much better hdmi video using config.txt below

Code:

[all] device_tree_address=0x4000 kernel=u-boot.bin arm_64bit=1 dtparam=audio=on,i2c_arm=on,spi=on dtoverlay=mmc dtoverlay=disable-bt dtoverlay=vc4-kms-v3d display_auto_detect=0 disable_overscan=1 max_framebuffers=2 framebuffer_width=1280 framebuffer_height=1024 camera_auto_detect=0 [cm4] otg_mode=1 [pi4] #hdmi_safe=1 armstub=armstub8-gic.bin arm_boost=1

Audio remains a bummer.
[PS: Recent versions of netbsd should have audio non 64bit in the lower 1G. ]

I am trying this config.txt

[all]
arm_64bit=1
dtparam=audio=on,i2c_arm=on,spi=on
dtoverlay=mmc
dtoverlay=disable-bt

dtoverlay=vc4-kms-v3d
max_framebuffers=2

device_tree_address=0x4000
kernel=u-boot.bin
camera_auto_detect=0

[pi4]
hdmi_safe=0
armstub=armstub8-gic.bin

over_voltage=15
force_turbo=1
arm_freq=2230
core_freq=990
gpu_freq=990
sdram_freq=2100

Using GLXINFO the rendering appears to still be done with MESA LLVMpipe and not with hardware acceleration.

Any suggestions gratefully received!