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To: FreeBSD-gnats-submit@freebsd.org
Subject: Crashing OS when changing between console screens
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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:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat May 29 23:40:01 PDT 1999
>Closed-Date:    Sat Jun 9 16:53:13 PDT 2001
>Last-Modified:  Sat Jun 09 16:53:41 PDT 2001
>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:

From: Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>
To: als@fl.net.au
Cc: FreeBSD-gnats-submit@freebsd.org,
	yokota@zodiac.mech.utsunomiya-u.ac.jp
Subject: Re: kern/11941: Crashing OS when changing between console screens 
Date: Fri, 09 Jul 1999 23:56:40 +0900

 >>Number:         11941
 >>Category:       kern
 >>Synopsis:       FreeBSD box reboots itself when changing screens at the conso
 >le
 [...]
 >>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.
 
 Was the user by any chance switching between vtys quite quickly?
 
 Would you possibly send us output from the `dmesg' command and
 `vidcontrol -i mode' command on this 3.1-RELEASE system, and the
 kernel configuration file if you are not running the GENERIC kernel?
 
 They might reveal something.
 
 Kazu
 yokota@FreeBSD.org
 
 >>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).
 
State-Changed-From-To: open->closed 
State-Changed-By: dd 
State-Changed-When: Sat Jun 9 16:53:13 PDT 2001 
State-Changed-Why:  
This has most likely been fixed, and the originator did not respond to 
yokota's request for further information. 

http://www.FreeBSD.org/cgi/query-pr.cgi?pr=11941 
>Unformatted:
