Comment 303 for bug 1098216
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a60fb26
(Get the code!)
The backlight keys do not work properly with kernel 3.15.1 and ThinkPad T530 (with Intel integrated graphics). Only 2 brightness levels are available.
I noticed that using native backlight option for Thinkpad T530 fixes the issue:
see attachment 140631
After applying the above patch 11 brightness levels + blank can be set (I am using an Xfce 4.10 desktop).
Weirdly, in pre 3.15 kernel versions adding the use native backlight option caused my monitor to become unresponsive (stay blank) after a screen lock followed by a suspend screen. I no longer get that behavior with kernel version 3.15.1. Should you need any more information I can happily provide it.