DOSBox: whole screen turns black

perryh at perryh at
Wed Jul 13 23:49:06 UTC 2011

Philipp <trashavenue at> wrote:

> Hello,
> I've installed DOSBox 0.74 from Ports on FreeBSD 8.2 STABLE. After
> starting DOSBox I get some weird graphical errors on the screen:
> short horizontal lines appear for less than a second, scattered
> on the whole screen. About 5 to 20 seconds later the screen turns
> black (dunno whether the monitor turns off) and after 2 seconds my
> desktop is back and it starts again.
> My graphics card is an Intel GMA 3000 (Q965) with xf86-video-intel-2.7.1_4.

It sure sounds as if the video signal coming out of the graphics
card is beyond the monitor's range.

That's not supposed to happen with recent xorg, unless the monitor
is misreporting its capabilities when the graphics card interrogates
it or something (related to DOSBox?) is issuing an xrandr for an
unsupported mode.

What kind of monitor?

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