Brightness up/down keys stopped working?

[David Rosenstrauch]

On 2017-06-20 5:41 pm, David Rosenstrauch wrote:
> On 06/20/2017 11:46 AM, David Rosenstrauch wrote:
>> I'm not sure what triggered this, but it looks like some recent 
>> upgrade has disabled the XF86MonBrightnessUp & Down keys, and I think 
>> the issue might be limited to XFCE.  (When I run xev under XFCE, it 
>> never registers that key press.  But when I launch fluxbox in VT8 and 
>> run xev there it does.)
>> 
>> Anyone aware of any recent release that might have caused this?  (And, 
>> if so, how I might fix it?)
>> 
>> Thanks,
>> 
>> DR
> 
> 
> A little more info:
> 
> Although xev doesn't register the brightness key events, it does seem
> to be firing some brightness related events that are unexpected:
> 
> RRNotify event, serial 68, synthetic NO, window 0x3e00001,
>     subtype XRROutputPropertyChangeNotifyEvent
>     output eDP1, property Backlight, timestamp 243122, state NewValue
> 
> DR

I think this may be relevant:  looks like for some reason the XFCE 
notifications daemon isn't running, and keypresses that trigger 
notifications are taking a long time to get processed:

Jun 20 18:07:27 darosedm dbus-daemon[642]: Activating service 
name='org.freedesktop.Notifications'
Jun 20 18:08:27 darosedm plasma_waitforname[5624]: 
org.kde.knotifications: WaitForName: Service was not registered within 
timeout
Jun 20 18:08:27 darosedm dbus-daemon[642]: Activated service 
'org.freedesktop.Notifications' failed: Process 
org.freedesktop.Notifications exited with status 1

DR