Date: Thu, 14 Oct 1999 22:24:05 -0400 (EDT)
From: rafal@mediaone.net
Reply-To: rafal@mediaone.net
To: gnats-bugs@gnats.netbsd.org
Subject: switching wscons screens occasionally updates display incorrectly


>Number:         9733
>Category:       kern
>Synopsis:       switching wscons screens can corrupt display
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Mar 31 00:16:56 PST 2000
>Closed-Date:    
>Last-Modified:  
>Originator:     Rafal Boni
>Release:        -current from 10/10 or so
>Organization:
none
>Environment:
System: NetBSD doppelganger.waterside.net 1.4L NetBSD 1.4L (DOPPELGANGER) #1: Tue Oct 12 18:44:19 EDT 1999 root@groo-the-wanderer.waterside.net:/usr/src/sys/arch/i386/compile/DOPPELGANGER i386
	problem happens on my laptop with Neomagic MagicGraph 128XD


>Description:
	I'm running the following:
		screen 0: tail -f cvs-update-log (which was empty and not
			  changing)
		screen 1: tcpdump -i ne0
		screen 2: vmstat 5


	At some point, I switched from screen 1 to screen 2 and noticed
	that the *middle* of the screen contained data from screen 1.
	Switched to screen 3 (empty screen with login prompt) and back,
	but the "droppings" from screen 1 were still present on screen 2.


	Screen 1 seemed to contain the right data.


	It looks like screen 1 was in the middle of a scrolling action
	when I switched screens.


>How-To-Repeat:
	See above..
>Fix:
	None available.
>Release-Note:
>Audit-Trail:
>Unformatted: