Ubuntu 21 on Raspberry Pi + 4K ウルトラワイドモニター + ツイ廃液晶

config.txt

[pi4]
disable_fw_kms_setup=1
max_framebuffers=2
disable_overscan=1
dtoverlay=vc4-fkms-v3d
hdmi_force_hotplug=1
boot_delay
kernel=vmlinuz
initramfs initrd.img followkernel
gpu_mem=512


[all]
arm_64bit=1
kernel=vmlinuz
cmdline=cmdline.txt
initramfs initrd.img followkernel

# Enable the audio output, I2C and SPI interfaces on the GPIO header
dtparam=audio=on
dtparam=i2c_arm=on
dtparam=spi=on

# Enable the FKMS ("Fake" KMS) graphics overlay, enable the camera firmware
# and allocate 128Mb to the GPU memory
#dtoverlay=vc4-fkms-v3d
#gpu_mem=512

# Comment out the following line if the edges of the desktop appear outside
# the edges of your display

# If you have issues with audio, you may try uncommenting the following line
# which forces the HDMI output into HDMI mode instead of DVI (which doesn't
# support audio output)
#hdmi_drive=2

# If you have a CM4, uncomment the following line to enable the USB2 outputs
# on the IO board (assuming your CM4 is plugged into such a board)
#dtoverlay=dwc2,dr_mode=host
#hdmi_group=2

[HDMI:0]
hdmi_enable_4kp60:0=1
hdmi_pixel_freq_limit:0=600000000
max_framebuffer_width:0=3440
max_framebuffer_height:0=1440
framebuffer_width:0=3440
framebuffer_height:0=1440
#hdmi_mode:0=87
#hdmi_group:0=2
#hdmi_cvt:0=3440 1440 60 7 0 0 1

[HDMI:1]
max_framebuffer_width:1=480
max_framebuffer_height:1=1920
framebuffer_width:1=480
framebuffer_height:1=1920
hdmi_mode:1=87
hdmi_timings:1=480 0 30 30 30 1920 0 6 6 6 0 0 0 60 0 55296000 0
hdmi_group:1=2
#hdmi_drive=2
#hdmi_force_mode=2