When I log into KDE on any driver above 304.64 the brightness is two values below the brightest, when I try to adjust the brightness with my FN - Brightness UP key combo it flashes up to the brightest setting for a second then back down to the two values below it. I have tried multiple driver versions above 304.64 and all of them have the same problem. Following are install details, if further information is needed I will post it.
Dist: Debian Testing 7.0
KDE: 4.8.4
Computer: Toshiba Qosimo (Laptop)
Nvidia version that works: 295.71 and 304.64
Nvidia versions that do not: 310.32, 310.40, 313.09 beta and 313.18 beta
Follow up, I just tried 304.84 figuring a minor version change wouldn’t have the same problem. It’s does. So this broke between 304.64 and 304.84. I figure that should make it easy to track down. Also 304.84 seems to break ttys too I switch to them and they are blank… Only 304.84 does this.
Still not working as of 310.44 trying acpi_backlight=legacy and acpi_backlight=vendor in my kernel lines did not help. Stuck on 304.64. Apparently it’s not just KDE that has these issues either.
I can try 319.12 later but I am pretty sure I will encounter the same bug there, my brightness controls still work they just don’t go to the highest level it’s very annoying. I am worried 4.10 will not fixes it for me either as it seems to be a different bug. Upgrading to 4.10 is also hard for me as it’s not in my distros repo.