kern/112256: SC_PIXEL_MODE crashs system

[Dr. Markus Waldeck]

>Number:         112256
>Category:       kern
>Synopsis:       SC_PIXEL_MODE crashs system
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Apr 29 20:50:01 GMT 2007
>Closed-Date:
>Last-Modified:
>Originator:     Dr. Markus Waldeck
>Release:        6.2-RELEASE
>Organization:
>Environment:
>Description:
I wanted to use a better resolution on the console of my laptop (T42).

So I built an kernel based on GENERIC and the addtion of following lines
options         SC_PIXEL_MODE
options         VESA

With vidcontrol MODE_324 I got 1400x1050 pixels.
This works fine but if I start X11 and I try to switch back to the console
the system hangs up.
If the sound is enabled this is combined with a special noise.

I could switch to a virtual terminal with the original resolution.
But if I change the resoultion in this terminal I will get the same effect.

X11 loads radeon.ko and drm.ko.

>How-To-Repeat:

>Fix:

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