Summary : interestingly, in a bare X session, xev does not react to those hotkeys, while it reacts to other. Does it mean the problem lies at X level ?
## General test To isolate the problem, I logged in with an empty account running OpenBox only (no full desktop environment) and ran xev. Here is the complete list of hotkeys I see when pressing special keys and Fn-* combinations, as reported by xev. $ grep -o 'XF86[^ )]*' /tmp/xevlog.txt | sort | uniq XF86AudioLowerVolume XF86AudioMute XF86AudioNext XF86AudioPlay XF86AudioPrev XF86AudioRaiseVolume XF86AudioStop XF86Bluetooth XF86Calculator XF86Display XF86Launch1 XF86Phone XF86Sleep XF86TouchpadToggle XF86WebCam XF86WLAN They all occur at expected places, except XF86Phone (Fn-T, without other symbol), XF86Launch1 (Fn-C, symbol like a monitor showing letter S). Also pressing Fn-F2 shows XF86WLAN (expected) but also XF86Bluetooth a few seconds after (expected only XF86WLAN but that's probably a feature). In bug description you can see which keys does what in regular desktop environment. ## Specific interesting part Now, something different happens when pressing Fn-F5 (brightness down), Fn-F6 (brightness up) and Fn-F7 (backlight toggle, icon shows screen covered by a big X). All three keys do change backlight as expected, but : Fn-F5 (brightness down) cause no event seen by xev Fn-F6 (brightness up) cause no event seen by xev Fn-F7 (backlight toggle) causes the events below (it seems to be the only key that provides keycode 253): KeyPress event, serial 48, synthetic NO, window 0x1600001, root 0xca, subw 0x0, time 704540, (23,116), root:(253,574), state 0x10, keycode 253 (keysym 0x0, NoSymbol), same_screen YES, XLookupString gives 0 bytes: XmbLookupString gives 0 bytes: XFilterEvent returns: False KeyRelease event, serial 48, synthetic NO, window 0x1600001, root 0xca, subw 0x0, time 704540, (23,116), root:(253,574), state 0x10, keycode 253 (keysym 0x0, NoSymbol), same_screen YES, XLookupString gives 0 bytes: XFilterEvent returns: False ## Now what ? Does it mean that these keys are missing at X input driver level ? I'd be okay to test some fix at the X level, so that this problem gets fixed. Thanks. -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-input-evdev in Ubuntu. https://bugs.launchpad.net/bugs/1042359 Title: Partially broken brightness hotkey handling. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-input-evdev/+bug/1042359/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp