A megoldás!
Nekem sikerült!
http://www.winischhofer.net/linuxsisvga.shtml#download

„SiS Display Control Panel” Ez minden kép hasznos egy progi lesz neked is.
Aztán!
4.3.0 (gcc 3.2) Ezt, miután kicsomagoltad másold be ide „/usr/lib/modules/drivers”.

Az alábbi pár sor pedig a csemegézésre szolgál. NEM biztos, hogy neked minden kell ebbõl!
Jelezd ha sikerült!

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#

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# MONITOR section
#

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# This section contains data for monitor configuration.

# Monitor section for CRT2 (master head)

Section „Monitor”

Identifier „CRT2”
VendorName „Monitor Vendor”
ModelName „Monitor Model”

# VertRefresh & HorizSync:
# Despite this section describing CRT2, you should set some values here
# anyway to keep XFree86 from deleting the mode from the mode list.
# The values don’t matter in any way as long as the upper limits are high
# enough to allow the resolution to be used on CRT2.
VertRefresh 60-75
HorizSync 30-90
# [sisctrl] Gamma correction
Gamma 1.000 1.000 1.000
EndSection

# Monitor section for CRT1 (slave head)
Section „Monitor”
Identifier „CRT1”
VendorName „Monitor Vendor”
ModelName „Generic Laptop Display Panel 1024×768”
HorizSync 31.5 – 48.5
VertRefresh 40.0 – 70.0
Option „dpms”
EndSection

#

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# DEVICE sections
#

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# This section contains configuration data of the video card.

# Device section for CRT1 (master head)

Section „Device”
Identifier „SiS 650-0”
Driver „sis”
VendorName „Videocard vendor”
BoardName „SiS 650”
Option „HWcursor”
Option „SWcursor”
Option „EnableSiSCtrl” „true”

# „BusID” is mandatory for dual head / Xinerama mode.
BusID „PCI:1:0:0”

# „Screen” is mandatory for dual head / Xinerama mode.
# Usually, „Screen 0” is CRT2 (master), „Screen 1” is CRT1
# (slave)
Screen 0

# [sisctrl] Set CRT1 status (Note: overrides auto-detection)
Option „ForceCRT1” „true”

# [sisctrl] Set CRT1 type
Option „ForceCRT1Type” „LCD”

# [sisctrl] Set CRT2 type (Note: overrides auto-detection)
Option „ForceCRT2Type” „SVIDEO”

# [sisctrl] TV related options
Option „TVStandard” „NTSC”
Option „SISTVAntiFlicker” „ADAPTIVE”
Option „SISTVSaturation” „0”
Option „SISTVColorCalibCoarse” „0”
Option „SISTVColorCalibFine” „0”
Option „SISTVCFilter” „true”
Option „SISTVYFilter” „1”
Option „SISTVXScale” „0”
Option „SISTVYScale” „0”
Option „TVXPosOffset” „0”
Option „TVYPosOffset” „0”

# [sisctrl] Gamma correction: Brightness values
# The driver does NOT write these to the hardware. Instead, for
# using gamma brightness, you need to execute sisctrl with the
# -setgammabrightness (or -sg) switch at server start. It is
# most convenient to do this by adding this to your ~/.xsession
# file:
# sisctrl -sg &
Option „StoredGammaBrightnessRed” „1000”
Option „StoredGammaBrightnessGreen” „1000”
Option „StoredGammaBrightnessBlue” „1000”
Option „StoredGammaPreBrightnessRed” „1000”
Option „StoredGammaPreBrightnessGreen” „1000”
Option „StoredGammaPreBrightnessBlue” „1000”

# [sisctrl] Xv related options
Option „XvDefaultContrast” „5”
Option „XvDefaultBrightness” „10”
Option „XvDefaultHue” „0”
Option „XvDefaultSaturation” „0”
Option „XvOnCRT2” „false”

# For MergedFB mode, see the following 7 options:

# To enable MergedFB mode, uncomment this
# Option „MergedFB” „true”
# „CRT2Position” to select the relative position of CRT2 to CRT1
# Valid choices are „LeftOf”, „RightOf”, „Above”, „Below” and
# „Clone”
# Option „CRT2Position” „LeftOf”

# Fill in the supported frequency ranges for your CRT2 device
# below. For LCD and TV, the values here don’t matter, but
# they must be high enough to keep the server from deleting
# some modes. HSync is in kHz, VRefresh in Hz. For example:
# Option „CRT2HSync” „31-64”
# Option „CRT2VRefresh” „50-75”

# The „MetaModes” select the (real) display modes to be used
# for CRT1 (left of „-„) and CRT2 (right of „-„). Eg:
# Option „MetaModes” „1280×1024-1024×768 1024×768-1024×768”

# Set this option to disable Pseudo-Xinerama support
# Option „NoMergedXinerama” „true”

# To reverse the screen order in Pseudo-Xinerama mode:
# Option „MergedXineramaCRT2IsScreen0” „true”
# or
# Option „MergedXineramaCRT2IsScreen0” „false”
EndSection

# Device section for CRT2 (Slave head)

Section „Device”
Identifier „SiS 650-1”
Driver „sis”

# For dual head mode, BusID must be specified!
BusID „PCI:1:00:0”

# Generally: Set all the options you need in the master
# section, not here. See above.

# „Screen” selects the screen number for this device in dual head mode
# Screen 1 is slave (always CRT1 = external VGA)
Screen 1

EndSection

#

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# SCREEN section(s)
#

---

# This section defines the available resulutions and depths.

# Screen section for CRT2 (LCD/DVI-D, TV, VGA2/DVI-A)

Section „Screen”
Identifier „Screen0”
Device „SiS 650-0”
Monitor „CRT2”
DefaultDepth 24
SubSection „Display”
Depth 24
Modes „1024×768” „800×600” „640×480”
EndSubSection
EndSection

Section „Screen”
Identifier „Screen1”
Device „SiS 650-1”
Monitor „CRT1”
DefaultDepth 24
SubSection „Display”
Depth 24
Modes „1024×768” „800×600” „640×480”
EndSubSection
EndSection

Section „ServerLayout”
Identifier „Default Layout”

# To enable dual head mode:
Screen „Screen0”
Screen „Screen1” RightOf „Screen0”

# This enables Xinerama. If you don’t set this to „on”, startx will spawn
# two indepentent X screens. In Xinerama mode, both screens are virtually
# one screen.

# Option „Xinerama” „on”
InputDevice „Mouse0” „CorePointer”
InputDevice „Keyboard0” „CoreKeyboard”
InputDevice „DevInputMice” „AlwaysCore”
EndSection

Section „DRI”
Group 0
Mode 0666
EndSection