Re: Console screen corruption?

[Sascha Wildner <saw@xxxxxxxxx>]

walt schrieb:
> On Fri, 12 Dec 2008, Sascha Wildner wrote:
>
> > walt schrieb:
> > > I've installed dfly using the kvm/qemu emulator and I'm seeing
> > > strange corruption of the console screen at times.
> > Does it happen randomly or when you do some specific thing? Did you change the
> > mode using vidcontrol(8) or does it happen with plain 80x25?
>
> Plain 80x25.  In fact I wish I could remember how to change to 80x50 :o)

Hm, you can change to 80x50 with 'vidcontrol -f 8x8 iso-8x8.fnt 80x50'. 
After trying 80x50, switch back to 80x25 with 'vidcontrol 80x25' and 
check if the problem persists.

Also, can you recompile with

options VGA_DEBUG=2
options FB_DEBUG=2

in your kernel config and post or mail me a verbose boot message?

AFAIK we don't mess with the VGA registers for our initial 80x25 (we 
just take the BIOS settings).

> I just discovered by accident that if I keep typing (any) characters
> the characters will disappear randomly as I type, until I get a linewrap.

Weird, I tried DragonFly in plain Windows qemu and the console behaves fine.

> At that point the entire line I just typed suddenly appears normal. If
> I continue typing on the (wrapped) line, it will again blank out chars
> randomly until I reach the second linewrap, when *both* lines on the
> screen suddenly appear normal again.
>
> Does that mean anything to you?  Pretty mysterious to me.

Yes, seems weird. I hope we can find the cause.

Sascha

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