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Date:      Sun, 30 May 1999 16:34:59 +1000 (EST)
From:      als@fl.net.au
To:        FreeBSD-gnats-submit@freebsd.org
Subject:   kern/11941: Crashing OS when changing between console screens
Message-ID:  <199905300634.QAA03266@notwork.snowville.fl.net.au>

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>Number:         11941
>Category:       kern
>Synopsis:       FreeBSD box reboots itself when changing screens at the console
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat May 29 23:40:01 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator:     Andrew Snow
>Release:        FreeBSD 3.1-RELEASE i386
>Organization:
No organisation
>Environment:

FreeBSD 3.0 and 3.1-RELEASE, Cyrix 6x86 P166+ processor, Gigabyte HX chipset
motherboard, 64MB system RAM, Tekram DC-390F (ncr) SCSI controller
with IBM ultrawide SCSI hard drive.  ed1 and de0 PCI network cards.

Video card:
vga0: <Cirrus Logic GD5434 SVGA controller> rev 0x26 int a irq 9 on pci0.10.0

Console video mode for one or more screens is often set to 80x50 from 80x25
with the vidcontrol utility.

>Description:

When at the console and changing screens (using the Alt+F1/F2/.. keystrokes),
very occasionally the system pauses for a few seconds then restarts.  No 
helpful information is found in any system log files. 

>How-To-Repeat:

It has only been experienced 3 times by this user.  Once was whilst running
3.0-RELEASE and the most recent two times were in a 3.1-RELEASE
installation.  It has only been experienced with this particular
motherboard/video card combination (it never happened on a different
motherboard but same video card, earlier, whilst running 3.0-RELEASE).

It _seems_ to only occur when one console screen is running in say 80x50
video mode, and the other in 80x25 (that was the situation the most
recent time it happened).  Alt+F3 was pressed and the video display
appeared corrupted for a few moments, and then the machine rebooted itself.

>Fix:

My workaround has been to not change console screens too much (or
change console video modes as it is the changing between screens of
different video modes that is suspected to be related to the problem).


>Release-Note:
>Audit-Trail:
>Unformatted:


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