bin/49393: screenblank doesn't wake on keyboard/mouse activity if root file-system is mounted with nodevmtime

[jmcneill%invisible.ca@localhost]

>Number:         49393
>Category:       bin
>Synopsis:       screenblank doesn't wake on keyboard/mouse activity if root file-system is mounted with nodevmtime
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Nov 15 00:25:01 +0000 2014
>Originator:     Jared McNeill
>Release:        7.99.1
>Organization:
>Environment:
NetBSD a31 7.99.1 NetBSD 7.99.1 (HUMMINGBIRD_A31) #297: Fri Nov 14 19:41:01 AST 2014  jmcneill@megatron.local:/Users/jmcneill/branches/HEAD/src/sys/arch/evbarm/compile/obj/HUMMINGBIRD_A31 evbarm
>Description:
screenblank(1) depends on wskbd device mtime to unblank the screen. This doesn't work if the "nodevmtime" option is in fstab for the root file-system.
>How-To-Repeat:
Using a frame buffer driver that supports WSDISPLAYIO_SVIDEO:

 - mount root fs with "nodevmtime" option
 - # /etc/rc.d/screenblank onestart
 - wait for 10 minutes
 - when the screen blanks, press a key on the keyboard
>Fix: