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setting screen rez.

mark ahlenius
Occasional Advisor

setting screen rez.


now that I have X11 working under RHL 7.3, I cannot seem to change the screen resolution. It seems stuck somewhere in one of the lowest resolution settings. Thus my browser and editors come up very large and I can't see whole documements like I can under an XP boot.

I have a SiS 650 graphics chipset on a HP Pavilion 540n computer. I got a link to a patched driver from this group (thanks!).

I have tried changing the Screen settings and Display settings in the /etc/X11/XF86Config-4 file, but cannot get the resolution to change.

below is a snapshot of that section of the file;

Section "Screen"
Identifier "Screen 1"
Device "SiS 650"
Monitor "Vivitron 1776"
DefaultDepth 16

Subsection "Display"
Depth 8
# Modes "640x480"
Modes "640x480" "800x600" "1024x768"
# Modes "1280x1024" "640x480" "800x600" "1024x768"
ViewPort 0 0
Subsection "Display"
Depth 16
Modes "640x480" "800x600" "1024x768"
# Modes "1280x1024" "640x480" "800x600" "1024x768"
# Modes "800x600"
ViewPort 0 0
Subsection "Display"
Depth 24
Modes "640x480" "800x600" "1024x768"
# Modes "1280x1024" "640x480" "800x600" "1024x768"
# Modes "1024x768"
ViewPort 0 0


Here is the section on the device driver:

Section "Device"
Identifier "SiS 650"
Driver "sis"
# VideoRam 256
# Insert Clocks lines here if appropriate


Also if I try to enable the "VideoRam" section ( the chipset has 32 Megs), it prevents X from coming up.

Any help would be appreciated.

best regards,

Honored Contributor

Re: setting screen rez.


Your configuration said
> DefaultDepth 16

so check out Depth 16.

> Depth 16
Modes "640x480" "800x600" "1024x768"

Looks like the first candidate resolution is 640x480.
Why don't you change this line?

Then if your X Window is up, try xdpyinfo to see your current resolution and depth.

And also /var/log/Xfree86.0.log give you more information such as how many video RAM your X Window recognize.

Good luck

Kodjo Agbenu
Honored Contributor

Re: setting screen rez.

Hi Mark,

SiS 650 is not yet supported by XFree86 4.x. That seems to be the reason why the 32 meg video RAM is not accepted.


If you want to be a beta-tester for future XFree86 releases, I found this on Google :

Otherwise, you will find an "official" driver here :

It was developed for XFree86 4.0 and 4.1 but in my op??nion, it should work with 4.2.

Good luck.

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