1.8 KiB
Dasung Paperlike display
FDS includes dasungd for the configured Dasung Paperlike 13K grayscale monitor.
The controller starts during early boot and remains supervised in the base system,
including console-only use. No GUI or ENVIRONMENT cartridge is required.
The supplied profile uses the dedicated monitor's EDID and USB companion identity, with raw mode 1 and contrast 4 as startup defaults. It is specific to that monitor; do not use its identity as a blanket match for other CH340 USB devices.
Inspect the controller
The controller's socket is restricted to root. From a root maintenance console on FDS:
dasungd status
dasungd query
status reports whether the monitor is connected and responsive, the age of its
last reply and cached parameters. query requests current values. To refresh
the display or adjust contrast:
dasungd refresh
dasungd set contrast 4
dasungd set mode 1 --save
dasungd forget mode
A successful set means the command was sent; use query/status to read back the
result. The grayscale model uses raw numeric modes. Saved overrides in
/run/dasungd/settings.json survive a daemon restart during the same boot, but
not power loss. Image configuration defaults are in /etc/dasungd.toml.
Diagnose a connection problem
Inspect /run/log/dasungd/current and the reported status. Discovery requires
the configured DRM EDID and matching USB companion topology. An ambiguous match
is rejected. Set usb_path only after identifying the intended device topology.
FDS uses the daemon for USB control. Its configuration disables the original workstation-specific display hotplug procedure. Video mode and cabling are part of the machine's boot/display configuration. The detailed protocol, build rationale and physical display procedures are in the developer reference.