kern/134504: thinkpad t60 with ati x1400 in vesa console mode 1400x1050, char is eated

[bsdx]

>Number:         134504
>Category:       kern
>Synopsis:       thinkpad t60 with ati x1400 in vesa console mode 1400x1050, char is eated
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed May 13 08:10:02 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator:     bsdx
>Release:        freebsd 7
>Organization:
>Environment:
FreeBSD fasia.osu.org 7.1 FreeBSD  #1: Mon May 11 14:28:14 UTC 2009     root at fasia.osu.org:/usr/obj/usr/src/sys/FASIA  i386
>Description:
I met the problem when I began use freebsd 6.1.
Before I use 8-current, I always use i386 version on my Thinkpad T60 with ati x1400 mobility. I compile the kernel with vesa and sc_pixel_mode
When I switch the mode to full 1400x1050 at console, use ls command, the problem appears, the first line is ok, the second line eat first char, the third eat first two chars, etc. For example(ls /bin) : the good 
[		df		link		pwd		sleep
cat		domainname	ln		rcp		stty
chflags		echo		ls		realpath	sync
chio		ed		mkdir		red		tcsh
chmod		expr		mv		rm		test

but it appears:
[		df		link		pwd		sleep
at		domainname	ln		rcp		stty
flags		echo		ls		realpath	sync
o		ed		mkdir		red		tcsh
d		expr		mv		rm		test

Ehen I use linux vesa console, it's ok
>How-To-Repeat:
Every time I switch to vesa console 1400x1050 mode.
>Fix:


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