13.02.2014 04:26, David Herrmann wrote: > The "attach" stuff actually sounds doable, but who decides which one > to attach? You still need some user-space script during device-plug > for that. > But to be honest, the simplest way would be a "backlightd" > bus-activatable daemon. SetBacklight() then takes a DRM-connector and > brightness-value, which the daemon looks up in /sys and sets.. This > has the advantage that we can do any fancy matching in user-space. We > can provide quirks (maybe even via udev-hwdb) and other helpers for > weird setups.
What would be done with Samsung monitors (like an old SyncMaster 770P) that have a DVI connection, no physical buttons and have to be controlled via DDC-CI? Currently, ddccontrol works (via /dev/i2c-*), but only from root. I would like this use case to be covered in such a way that it could work both in Xorg and in Wayland, and, if possible, without races related to i2c usage from the kernel and from userspace. -- Alexander E. Patrakov
