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Date: Tue, 22 Dec 1998 06:10:02 -0800 (PST)
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To: freebsd-bugs@FreeBSD.ORG
From: Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>
Subject: Re: kern/9143: Instabilities of 3.0-RELEASE due to syscons driver 
Reply-To: Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>
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The following reply was made to PR kern/9143; it has been noted by GNATS.

From: Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>
To: p@znet.de
Cc: FreeBSD-gnats-submit@freebsd.org, yokota@zodiac.mech.utsunomiya-u.ac.jp
Subject: Re: kern/9143: Instabilities of 3.0-RELEASE due to syscons driver 
Date: Tue, 22 Dec 1998 23:06:16 +0900

 >>Number:         9143
 >>Category:       kern
 >>Synopsis:       syscons of 3.0-RELEASE causes system to crash
 [...]
 >>Release:        FreeBSD 3.0-RELEASE i386
 >>Environment:
 >
 >486DX2, 16 MB RAM, Tseng ET4000 based ISA video adapter.
 >sc driver (syscons) of 3.0-RELEASE.
 >
 >>Description:
 >
 >The sc driver may cause the kernel to panic when using multiple video
 >modes and/or XFree86.
 >
 >>How-To-Repeat:
 >
 >Simple: Type "vidcontrol VGA_80x30" on a virtual tty (you will get 30 lines
 >on your display). Start some applications. Try to switch back to a terminal
 >with the standard mode (25 lines). You will get a long beep and the system
 >crashes.
 >
 >With X11: start X11 via xdm. Wait until xdm login screen appears. Log
 >in, start a memory intensive application (e.g. Netscape Communicator 4.5).
 >Try to switch back to a virtual syscons tty (CTRL-ALT-F1 for example).
 >A long beep, and the system crashes.
 
 Would you describe more about the crash?  Did the beep sound stop?
 Did you see any panic messages?
 
 Would you also show us your kernel configuration file?  Does it
 include "options VESA"?  Were you using any VESA modes (132x25,
 132x43, etc) in other vtys when your system crashed?
 
 >>Fix:
 >	
 >The problem went away when I upgraded the sc driver with the one of
 >3.0-CURRENT (current from 1998/12/18). You have to tweak a little bit because
 > f the changed inthand2_t (ointhand2_t)-stuff of 3.0-CURRENT.
 
 Hmmm.
 
 Changes after 3.0-RELEASE are all minor and it is difficult to see why
 your problem is solved by using the latest syscons.c...
 
 Kazu
 yokota@FreeBSD.ORG
 
 

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