Screen Brightness Keys Not Working - Thinkpad W540 & Fedora 20

[D. Hugh Redelmeier]

| From: CS DBA <cs_dba at consistentstate.com>

| Just setup a Thinkpad W540, most everything is working well.

I hope you are aware that there is a BIOS bug that can cause Linux to
brick the machine.  As in: once it happens, the motherboard needs to
be replaced.

See this, for example:
<http://forums.lenovo.com/t5/W-Series-ThinkPad-Laptops/HOWTO-Brick-a-W540-in-easy-steps/m-p/1414465/highlight/true#M43530>

Google will tell you more.