7inch Capacitive Touch Screen LCD (C), 1024×600, HDMI, Does not work with DietPi v9.2.1

[learncodingforweb]

7inch Capacitive Touch Screen LCD (C), 1024×600, HDMI, Does not work with DietPi v9.2.1

[learncodingforweb]

resolved option. Step i followed

1. Install Dietpi
2. open sd card and edited config.txt by adding following

hdmi_group=2
hdmi_mode=87
hdmi_cvt 1024 600 60 6 0 0 0
hdmi_drive=1

[MichaIng]

Jep, DietPi an RPi OS are fully config compatible. Just note that these hdmi_* settings work only with the legacy graphics driver, not with KMS enabled. So I do actually wonder that this works OOTB on RPi OS Bookworm, where KMS is enabled OOTB. Did you remove the dtoverlay=vc4-kms-v3d line there?

With KMS enabled, display resolution and rotation needs to be applied a differently: https://www.raspberrypi.com/documentation/computers/configuration.html#command-line-options

[learncodingforweb]

I have not changed anything other than config.txt by adding

hdmi_group=2
hdmi_mode=87
hdmi_cvt 1024 600 60 6 0 0 0
hdmi_drive=1

[MichaIng]

Interesting: On RPi OS Bookworm these options are all legacy and should not have any effect anymore, at least unless you manually revert to legacy framebuffer graphics by removing dtoverlay=vc4-kms-v3d from your config.txt. Is this line really still present?

Furthermore, as you want to set the resolution for your desktop (?): These have their own display and resolution settings, while the hdmi_* and cmdline.txt KMS settings are for console mode resolution only. Of course they are the initial resolution for X sessions as well, but the X server and/or desktop environment can and usually do change it, at least when you used their display settings once 🤔.

However, good that you found a solution that works for you. I'll need to play with all of this anyway, to migrate our dietpi-config resolution options for new RPi kernel/firmware stack.