Hello and happy new year to all
When converting to Bookworm for my Pi 4b i got the same problem as i had with the older Pi OS Buster and Bullseye versions, with a not working display ....so i had to find a solution since the config.txt file is not what i was used to in the older version Buster. So to get my Motorola Lapdock and an old Samsung tv working again with the 1360 x 768 screen resolution ( and not 1366 x 768 ) was to implement following ...NOTE: it's important to *hash* the line disable_fw_kms_setup or alternative just insert *=0* instead of *=1*.
[this]
#disable_fw_kms_setup=1
hdmi_group=2
hdmi_mode=39
[/this]
and below, the whole config.txt
[working Bookworm config.txt]
# For more options and information see
# http://rptl.io/configtxt
# Some settings may impact device functionality. See link above for details
# Uncomment some or all of these to enable the optional hardware interfaces
#dtparam=i2c_arm=on
#dtparam=i2s=on
#dtparam=spi=on
# Enable audio (loads snd_bcm2835)
dtparam=audio=on
# Additional overlays and parameters are documented
# /boot/firmware/overlays/README
# Automatically load overlays for detected cameras
#camera_auto_detect=1
# Automatically load overlays for detected DSI displays
display_auto_detect=1
# Automatically load initramfs files, if found
auto_initramfs=1
# Enable DRM VC4 V3D driver
dtoverlay=vc4-kms-v3d
max_framebuffers=2
# Don't have the firmware create an initial video= setting in cmdline.txt.
# Use the kernel's default instead.
#disable_fw_kms_setup=1
hdmi_group=2
hdmi_mode=39
# Run in 64-bit mode
arm_64bit=1
# Disable compensation for displays with overscan
disable_overscan=1
# Run as fast as firmware / board allows
arm_boost=1
[cm4]
# Enable host mode on the 2711 built-in XHCI USB controller.
# This line should be removed if the legacy DWC2 controller is required
# (e.g. for USB device mode) or if USB support is not required.
otg_mode=1
[all]
over_voltage=4
arm_freq=1900
gpu_freq=600
usb_max_current_enable=1
[/working Bookworm config.txt]
When converting to Bookworm for my Pi 4b i got the same problem as i had with the older Pi OS Buster and Bullseye versions, with a not working display ....so i had to find a solution since the config.txt file is not what i was used to in the older version Buster. So to get my Motorola Lapdock and an old Samsung tv working again with the 1360 x 768 screen resolution ( and not 1366 x 768 ) was to implement following ...NOTE: it's important to *hash* the line disable_fw_kms_setup or alternative just insert *=0* instead of *=1*.
[this]
#disable_fw_kms_setup=1
hdmi_group=2
hdmi_mode=39
[/this]
and below, the whole config.txt
[working Bookworm config.txt]
# For more options and information see
# http://rptl.io/configtxt
# Some settings may impact device functionality. See link above for details
# Uncomment some or all of these to enable the optional hardware interfaces
#dtparam=i2c_arm=on
#dtparam=i2s=on
#dtparam=spi=on
# Enable audio (loads snd_bcm2835)
dtparam=audio=on
# Additional overlays and parameters are documented
# /boot/firmware/overlays/README
# Automatically load overlays for detected cameras
#camera_auto_detect=1
# Automatically load overlays for detected DSI displays
display_auto_detect=1
# Automatically load initramfs files, if found
auto_initramfs=1
# Enable DRM VC4 V3D driver
dtoverlay=vc4-kms-v3d
max_framebuffers=2
# Don't have the firmware create an initial video= setting in cmdline.txt.
# Use the kernel's default instead.
#disable_fw_kms_setup=1
hdmi_group=2
hdmi_mode=39
# Run in 64-bit mode
arm_64bit=1
# Disable compensation for displays with overscan
disable_overscan=1
# Run as fast as firmware / board allows
arm_boost=1
[cm4]
# Enable host mode on the 2711 built-in XHCI USB controller.
# This line should be removed if the legacy DWC2 controller is required
# (e.g. for USB device mode) or if USB support is not required.
otg_mode=1
[all]
over_voltage=4
arm_freq=1900
gpu_freq=600
usb_max_current_enable=1
[/working Bookworm config.txt]
Statistics: Posted by johnkramme — Tue Jan 02, 2024 11:03 pm