Egbert
> If trident works it is better as it is accelerated.
> Vesa uses the BIOS and allows mode switching - but it is
> unacceled. It may still have quirks. fbdev is so simple
> it should always work - but unaccelerated.
I think I may have found something interesting (thus I copy the list ;-)
1) Using Vesa driver works.
2) Passing vga=790 or vga=791 or even vga=792 at linux kernel and using
Trident driver *works* but it's very slooow, a lot slower that Vesa
driver, in 24bpp and 16bpp -I didn't try 8bpp-
3) Never use vga=xxx and Vesa XFree driver all together. It seems to be
dangerous for the LCD display (use either normal textmode with XFree
Vesa driver or fb text mode with XFree trident driver, but *not* fb text
mode and Vesa driver !)
What's puzzling me is why the trident driver with vga=xxx is so slow. I
include my XF86Config file so you can check and see by yourself (note
that I define all 3 devices, vesa, trident and fbdev and select the one
I want by uncommenting the right line in the screen section)
Section "ServerLayout"
Identifier "XFree86 Configured"
Screen 0 "Screen0" 0 0
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection
Section "Files"
FontPath "unix/:7100"
EndSection
# Module loading section
Section "Module"
Load "dbe" # Double-buffering
Load "GLcore" # OpenGL support
Load "dri" # Direct rendering infrastructure
Load "glx" # OpenGL X protocol interface
Load "extmod" # Misc. required extensions
# Load "v4l" # Video4Linux
# Load "pex5" # PHIGS for X 3D environment (obsolete)
# Load "record" # X event recorder
# Load "xie" # X Image Extension (obsolete)
# You only need the following two modules if you do not use xfs.
# Load "freetype" # TrueType font handler
# Load "type1" # Adobe Type 1 font handler
EndSection
Section "InputDevice"
Identifier "Keyboard0"
Driver "keyboard"
Option "XkbLayout" "fr"
EndSection
Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Device" "/dev/mouse"
Option "Protocol" "PS/2"
Option "Emulate3Buttons" "on"
Option "ZAxisMapping" "4 5"
EndSection
Section "Monitor"
Identifier "My Monitor"
VendorName "Unknown"
ModelName "Unknown"
HorizSync 31.5 - 48.5
VertRefresh 50-70
Option "dpms"
EndSection
Section "Device"
Identifier "* Generic VESA compatible"
Driver "vesa"
BoardName "Unknown"
Option "UseFBDev"
EndSection
Section "Device"
Identifier "Linux Frame Buffer"
Driver "fbdev"
BoardName "Unknown"
EndSection
Section "Device"
Identifier "Trident"
Driver "trident"
BoardName "Unknown"
Option "NoAccel" "false"
Option "ShadowFB" "false"
BusID "PCI:1:0:0"
Option "CyberStretch" "false"
Option "CyberShadow" "true"
Option "ShadowFB" "true"
EndSection
Section "Screen"
Identifier "Screen0"
Device "* Generic VESA compatible"
#Device "Linux Frame Buffer"
#Device "Trident"
Monitor "My Monitor"
DefaultDepth 16
Subsection "Display"
Depth 24
Modes "1024x768" "800x600" "640x480"
EndSubSection
Subsection "Display"
Depth 16
Modes "1024x768" "800x600" "640x480"
EndSubSection
Subsection "Display"
Depth 8
Modes "1024x768" "800x600" "640x480"
EndSubSection
EndSection
Section "DRI"
Mode 0666
EndSection
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