Hi,

I have a Dell Inspiron 8000 with an ATI Mobility M4 AGP (32 MB) and a TFT
display with a resolution of 1600x1200. I'm running XFree86 4.2 from the
SuSE8.0 CDs (2.4.18 Kernel).

Starting X with 1600x1200 is no problem. However, if I want to
connect the laptop to a beamer I need lower resolutions, i.e. 800x600 and
1024x768, but no matter what I do it doesn't work. As you can see from
my XF86Config file below I don't specify modelines and this works quite
well for 1600x1200. However, if I change to 800x600 in the Screen section
X discards all default 800x600 modes (either "vrefresh out of range" or
"hsync out of range" or "bad mode clock/interlace/doublescan") and
switches back to 1600x1200.

(A funny observation: If I increase the v- and hsync range I, indeed,
additional default modes like 1280x1024 or 1280x960 are available but all
with a dot clock of 160 MHz which of course then leads to v- and hync
rates beyond the specified range for lower resolutions. BTW, using these
modes also does not work, either the screen is corrupted (computer still
works) or the screen becoms white and the computer hangs. Where do these
default resolutions come from?)

Of course I also tried to specify modelines in the XF86Config files, e.g.

Modeline      "800x600" 37.44 800 816 928 1072 600 600 605 626

However, X still complains that the Hsync rate is out of range, though,
according to my calculations, it should be 34.9 kHz and therefore within
the allowed range. How does X determine the required frequencies?


In order to solve this problem I already invested a lot of time looking
into newsgroups and sending mails to discussion forums but up to now
knowbody was able to help me. Therefore all comments/suggestions that help
me to understand what's going wrong here are highly appreciated.

Best regards
        Alexander

---------------------------------------
/etc/X11/XF86Config:

Section "Files"
  FontPath     "/usr/X11R6/lib/X11/fonts/misc:unscaled"
  FontPath     "/usr/X11R6/lib/X11/fonts/local"
  FontPath     "/usr/X11R6/lib/X11/fonts/75dpi:unscaled"
  FontPath     "/usr/X11R6/lib/X11/fonts/100dpi:unscaled"
  FontPath     "/usr/X11R6/lib/X11/fonts/Type1"
  FontPath     "/usr/X11R6/lib/X11/fonts/URW"
  FontPath     "/usr/X11R6/lib/X11/fonts/Speedo"
  FontPath     "/usr/X11R6/lib/X11/fonts/PEX"
  FontPath     "/usr/X11R6/lib/X11/fonts/cyrillic:unscaled"
  FontPath     "/usr/X11R6/lib/X11/fonts/latin2/misc:unscaled"
  FontPath     "/usr/X11R6/lib/X11/fonts/latin2/75dpi:unscaled"
  FontPath     "/usr/X11R6/lib/X11/fonts/latin2/100dpi:unscaled"
  FontPath     "/usr/X11R6/lib/X11/fonts/latin2/Type1"
  FontPath     "/usr/X11R6/lib/X11/fonts/latin7/75dpi:unscaled"
  FontPath     "/usr/X11R6/lib/X11/fonts/baekmuk:unscaled"
  FontPath     "/usr/X11R6/lib/X11/fonts/japanese:unscaled"
  FontPath     "/usr/X11R6/lib/X11/fonts/kwintv:unscaled"
  FontPath     "/usr/X11R6/lib/X11/fonts/truetype"
  FontPath     "/usr/X11R6/lib/X11/fonts/uni:unscaled"
  FontPath     "/usr/X11R6/lib/X11/fonts/CID"
  FontPath     "/usr/X11R6/lib/X11/fonts/ucs/misc:unscaled"
  FontPath     "/usr/X11R6/lib/X11/fonts/ucs/75dpi:unscaled"
  FontPath     "/usr/X11R6/lib/X11/fonts/ucs/100dpi:unscaled"
  FontPath     "/usr/X11R6/lib/X11/fonts/hellas/misc:unscaled"
  FontPath     "/usr/X11R6/lib/X11/fonts/hellas/75dpi:unscaled"
  FontPath     "/usr/X11R6/lib/X11/fonts/hellas/100dpi:unscaled"
  FontPath     "/usr/X11R6/lib/X11/fonts/hellas/Type1"
  FontPath     "/usr/X11R6/lib/X11/fonts/misc/sgi:unscaled"
  FontPath     "/usr/X11R6/lib/X11/fonts/xtest"
  ModulePath   "/usr/X11R6/lib/modules"
  RgbPath      "/usr/X11R6/lib/X11/rgb"
EndSection

Section "ServerFlags"
  Option       "AllowMouseOpenFail"
EndSection

Section "Module"
  Load         "dbe"
  Load         "type1"
  Load         "speedo"
  Load         "extmod"
  Load         "record"
  Load         "xtrap"
  Load         "xie"
  Load         "freetype"
  Load         "glx"
  Load         "dri"
  Load         "v4l"
EndSection

Section "InputDevice"
  Driver       "keyboard"
  Identifier   "Keyboard[0]"
  Option       "Protocol" "Standard"
  Option       "XkbKeyCodes" "xfree86"
  Option       "XkbLayout" "de"
  Option       "XkbModel" "pc104"
  Option       "XkbRules" "xfree86"
  Option       "XkbVariant" "nodeadkeys"
EndSection

Section "InputDevice"
  Driver       "mouse"
  Identifier   "Mouse[0]"
  Option       "ButtonNumber" "3"
  Option       "Device" "/dev/mouse"
  Option       "Name" "AutoDetected"
  Option       "Protocol" "PS/2"
  Option       "Vendor" "AutoDetected"
EndSection


Section "InputDevice"
  Driver        "mouse"
  Identifier    "Mouse[1]"
  Option        "Device"        "/dev/input/mice"
  Option        "Protocol"      "imps/2"
  Option        "ZAxisMapping"  "4 5"
EndSection


Section "Monitor"
  Option       "CalcAlgorithm" "IteratePrecisely"
  HorizSync    30-95
  Identifier   "Monitor[0]"
  ModelName    "AutoDetected"
  Option       "DPMS"
  VendorName   "AutoDetected"
  VertRefresh  30-75
EndSection

Section "Screen"
  DefaultDepth 24
  SubSection "Display"
    Depth      24
    Modes      "800x600"
  EndSubSection
  Device       "Device[0]"
  Identifier   "Screen[0]"
  Monitor      "Monitor[0]"
EndSection


Section "Device"
  Driver       "ati"
  Identifier   "Device[0]"
  Option       "dpms"
  Screen       0
EndSection

Section "ServerLayout"
  Identifier   "Layout[all]"
  InputDevice  "Keyboard[0]" "CoreKeyboard"
  InputDevice  "Mouse[0]" "CorePointer"
  InputDevice  "Mouse[1]" "SendCoreEvents"
  Option       "Clone" "off"
  Option       "Xinerama" "off"
  Screen       "Screen[0]"
EndSection

Section "DRI"
    Group      "video"
    Mode       0666
EndSection


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