Hi all, at Akademy we discussed some plans on how to handle screen brightness on Wayland. Unfortunately I must say that this doesn't work at all as we imagined :-(
I had a look at what Weston is doing for brightness. It uses a forked "libbacklight" which internally interacts with the sysfs brighness helpers. I integrated this into KWin and tried to change backlight. But this obviously did not work as only root user is allowed to write to the sysfs file. I then tried to open it with the logind wrapper, but logind doesn't have support for this kind of files, so that unfortunately doesn't work either. And here, poor fool, I stand once more, no wiser than I was before. We have a file only root can write to, but we are not root. Adding a KAuth helper to KWin would not gain us anything compared to having it in powerdevil. So I suggest that we drop the idea that KWin is responsible for backlight and move this feature completely to powerdevil and use the KAuth helper. Cheers Martin
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