Comment 2 for bug 1248808

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Martin Pitt (pitti) wrote : Re: volume and brightness keys are mismapped on Samsung Chromebook

Can you please install the "evtest" package, run "sudo evtest", and select the device which represents your keyboard? Then you can press the Fn keys and check which of them have a wrong KEY_* code. Please note down the scan code, current, and intended key code.

 For example,

Event: time 1384346796.203894, type 4 (EV_MSC), code 4 (MSC_SCAN), value 06
Event: time 1384346796.203894, type 1 (EV_KEY), code 227 (KEY_SWITCHVIDEOMODE), value 0

This is scan code 4 (from "code 4 (MSC_SCAN)"), and key code "SWITCHVIDEOMODE". With the updated map that you provide I can fix udev's keymaps.