I had previously been running Kde 4.10.x from the 4.11 Factory repo.
I have since switched over to the stable 4.11 repo.
Two regressions I’ve found so far after going from Factory to stable.
On my main desktop running the 325.15 NVIDIA driver upon reboot there is massive tearing and it seems that vsync isn’t working at all at this point. The only way I have found to fix this is to toggle the OpenGL level (in my my case I flip it from 3.1 to 2.0 and then back). This behavior wasn’t present with the Factory packages. For KDE vsync I use full screen repaints as that is the only setting that eliminates tearing. Switching this setting has no effect. Only changing OpenGL levels seems to engage vsync.
On my Asus Zenbook, the keyboard backlight controls that were working with the 4.11 Factory repo no longer work. There isn’t even a keyboard brightness slider in the taskbar power settings like there was in the Factory repo packages.
Both of these seem like fairly serious regressions, given how smoothly they had been working until the final stable upgrade. I’m going to continue to play around and see what else I find.
It seems that on the Asus Zenbook if you login then immediately logout and login again, the keyboard brightness controls work just as they had previously. This holds true for my user account and the test user account I made to see if there was an old config file that might be messing with the settings. I’m not sure why it doesn’t load the first time, but it’s very annoying.
Just tried it, I don’t seem to have that problem, using the packages from the KR411 repo.
Like the OP I also have some backlight issues with KDE, but in my case I don’t think its a regression because I think I remember 4.10 doing the same thing (at least with the fn keys, the screen dim bug might be a regression). Its quite annoying:
Both my fn keys and kde’s brightness control work to change my brightness. But when I use my fn brightness keys, the brightness changes but KDE does not realize it changed and continues to show the old brightness. I also have an issue with the “screen dim” feature in the power settings. If I leave my laptop unplugged long enough for the screen dim to go into effect after 2 minutes, when I plug it back in it doesn’t return to 100% brightness like it is supposed to, but instead returns to ~50% brightness. KDE is the only DE I have these issues on, the fn keys work flawlessly in gnome or XFCE. KDE’s brightness handling seems quite buggy.
I have not had the issue where there is no brightness slider in the battery applet though, its always there on first login for me.