(Changing the heat, severity, or the fact that it's used by lubuntu won't solve the bug magically unless someone works on it.)
This might be fixed by this upstream commit, if someone wants to try: <http://git.xfce.org/xfce/xfce4-power-manager/commit/?id=6b86e87fabb8ffe7916aa9c18d8b21e8d7896870> (either that, or missing calls to gdk_error_trap_push() and gdk_error_trap_pop() around XRRQueryOutputProperty() in xfpm_brightness_xrand_get_limit() to handle the case when the output doesn't support the old "BACKLIGHT" atom).
(Changing the heat, severity, or the fact that it's used by lubuntu won't solve the bug magically unless someone works on it.)
This might be fixed by this upstream commit, if someone wants to try: <http:// git.xfce. org/xfce/ xfce4-power- manager/ commit/ ?id=6b86e87fabb 8ffe7916aa9c18d 8b21e8d7896870> (either that, or missing calls to gdk_error_ trap_push( ) and gdk_error_ trap_pop( ) around XRRQueryOutputP roperty( ) in xfpm_brightness _xrand_ get_limit( ) to handle the case when the output doesn't support the old "BACKLIGHT" atom).