This is what he suggests (if the above is indeed what Ubuntu uses, because it is meant for Fedora):
In the gsd_backlight_helper_get_best_backlight helper.
It only looks at the type of backlight and not at the connection between the backlight interface and the connector.
An option is, if the gsd_backlight_helper_get_type (devices, "firmware")
and gsd_backlight_helper_get_type (devices, "platform") calls both
are unsuccessful, then instead of using gsd_backlight_helper_get_type which simply returns the first matching one of the found backlights of type raw, do the following:
Take $PATH as the variable to /sys/class/backlight/foo dir
and check the content of $PATH/../enabled, it has to be "enabled", that way you can find out which backlight interface is connected to an LVDS interface that actually has a connected LCD.
If no interface is found with:
`cat $PATH/../enabled` == "enabled" then as a fallback, still return the first found interface.
I tried to implement this, but just getting the development environment setup to develop and test took me so much time that I haven't gotten to it.
Perhaps the above is easy to implement for someone with the proper setup.
Please keep us informed, if I make progress I will post too (but that might take a while).
cheers
Hi,
Thanks for your feedback. I had a chat with somebody with some experience and he suggested it should be fixed in userspace, here: /git.gnome. org/browse/ gnome-settings- daemon/ tree/plugins/ power/gsd- backlight- linux.c
https:/
This is what he suggests (if the above is indeed what Ubuntu uses, because it is meant for Fedora):
In the gsd_backlight_ helper_ get_best_ backlight helper. helper_ get_type (devices, "firmware") helper_ get_type (devices, "platform") calls both helper_ get_type which simply returns the first matching one of the found backlights of type raw, do the following:
It only looks at the type of backlight and not at the connection between the backlight interface and the connector.
An option is, if the gsd_backlight_
and gsd_backlight_
are unsuccessful, then instead of using gsd_backlight_
Take $PATH as the variable to /sys/class/ backlight/ foo dir
and check the content of $PATH/../enabled, it has to be "enabled", that way you can find out which backlight interface is connected to an LVDS interface that actually has a connected LCD.
If no interface is found with:
`cat $PATH/../enabled` == "enabled" then as a fallback, still return the first found interface.
I tried to implement this, but just getting the development environment setup to develop and test took me so much time that I haven't gotten to it.
Perhaps the above is easy to implement for someone with the proper setup.
Please keep us informed, if I make progress I will post too (but that might take a while).
cheers