Re: Using an external monitor with a laptop

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Date: 10 Nov 2005 01:52:25 -0800

Dances With Crows wrote:
> On 9 Nov 2005 15:55:26 -0800, ejner1@gmail.com staggered into the Black
> Sun and said:
> > My system is a laptop with a shared graphics card
>
> ? Did you mean "a graphics card that can't do dual-head"? What's the
> make+model of this laptop? Or the output of "lspci | grep VGA",
> whichever's easier....

0000:01:00.0 VGA compatible controller: Silicon Integrated Systems
[SiS] 661FX/M661FX/M661MX/741/M741/760/M760 PCI/AGP

- I don't know if this tells if the graphics card can go dual-head ?

>
> > Ubuntu 5.04. The resolution on the LCD 15" laptop screen is 1024x768.
> > [Sometimes] I attach a 19" TFT monitor [to the laptop's VGA
> > connector]. That then shows the content from the laptop screen.
> > I would like to be able to increase the resolution to 1280x1024.
>
> This may or may not be possible. My laptop has a 1600x1200 LCD, but the
> highest resolution possible on its external VGA port is 1280x1024. The
> external port/controller/whatever was almost certainly designed this way
> to save money. It may be that your laptop's hardware is set up in such
> a way that the max resolution on the external VGA is equal to the LCD's
> max resolution, <sarcasm> because who would ever want more than that?
> </sarcasm>

In Windows XP, I managed to get the 1280x1024 resolution.

>
> > Section "Device"
> > Driver "sis"
> >
> > Section "Monitor"
> > HorizSync 28-49
> > VertRefresh 43-72
>
> You may want to increase these ranges. If I use "normal LCD" ranges on
> my laptop, the only Mode I can use is 1600x1200. I have mine set to
> ranges far in excess of what the LCD can do, 20-150 Hsync and 10-400
> Vsync IIRC.
>
> > SubSection "Display"
> > Depth 24
> > Modes "1024x768" "800x600" "640x480"
> > EndSubSection
>
> There's no "1280x1024" entry here. There needs to be one if you want to
> use that Mode. If you put one in, restart X, and X doesn't behave the
> way you expect, look in /var/log/Xorg.0.log for possible reasons why.
> Things like "Not using Modeline 1280x1024 (needed Hsync XX KHz violates
> Hsync range YY-ZZ KHz) " are what you'll probably see.

Ok, I'll try that next.

>
> Or it might be that you have a 6326 SiS chip, and that's limited by
> hardware to using 4M for the 2D engine, and 1280x1024 @ 32bpp requires
> 5M. In that case, drop down to 16-bit color and you'll be fine. (You
> can also manually set the VideoRam parameter, but setting this to > 4M
> will disable acceleration on a SiS 6326, which is a pain.)

>>From lspci it said [SiS] 661FX/M661FX/M661MX Host (rev 11), so that is
probably not the case.

>
> --
> Matt G|There is no Darkness in Eternity/But only Light too dim for us to see
> Brainbench MVP for Linux Admin / mail: TRAP + SPAN don't belong
> http://www.brainbench.com / "He is a rhythmic movement of the
> -----------------------------/ penguins, is Tux." --MegaHAL

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