r128 - ATI Rage 128 video driver
r128 is an Xorg driver for ATI Rage 128 based video cards. It contains
full support for 8, 15, 16 and 24 bit pixel depths, hardware acceleration of
drawing primitives, hardware cursor, video modes up to 1800x1440 @ 70Hz,
doublescan modes (e.g., 320x200 and 320x240), gamma correction at all pixel
depths, a fully programming dot clock and robust text mode restoration for VT
switching. Dualhead is supported on M3/M4 mobile chips.
The r128 driver supports all ATI Rage 128 based video cards including the
Rage Fury AGP 32MB, the XPERT 128 AGP 16MB and the XPERT 99 AGP 8MB.
Please refer to xorg.conf(5) for general configuration details. This section
only covers configuration details specific to this driver.
The driver auto-detects all device information necessary to
initialize the card. However, if you have problems with auto-detection, you
VideoRam - in kilobytes
MemBase - physical address of the linear framebuffer
IOBase - physical address of the MMIO registers
ChipID - PCI DEVICE ID
In addition, the following driver Options are
- Option "SWcursor" "boolean"
- Selects software cursor. The default is off.
- Option "NoAccel" "boolean"
- Enables or disables all hardware acceleration. The default is to
enable hardware acceleration.
- Option "EnablePageFlip"
- Enable page flipping for 3D acceleration. This will increase performance
but not work correctly in some rare cases, hence the default is
- Option "RenderAccel"
- Enables or disables hardware Render acceleration. It is only supported
when using EXA acceleration and DRI. The default is to enable
- Option "AccelMethod"
- Chooses between available acceleration architectures. Valid options are
XAA and EXA. XAA is the traditional acceleration
architecture and support for it is very stable. EXA is a newer
acceleration architecture with better performance for the Render and
Composite extensions. The default is XAA.
- Option "Dac6Bit" "boolean"
- Enables or disables the use of 6 bits per color component when in 8 bpp
mode (emulates VGA mode). By default, all 8 bits per color component are
used. The default is off.
- Option "VideoKey" "integer"
- This overrides the default pixel value for the YUV video overlay key. The
default value is undefined.
- Option "Display" "string"
- Select display mode for devices which support flat panels. Supported modes
"FP" - use flat panel;
"CRT" - use cathode ray tube;
"Mirror" - use both FP and CRT;
"BIOS" - use mode as configured in the
The default is FP.
The following Options are mostly important for non-x86
- Option "ProgramFPRegs"
- Enable or disable programming of the flat panel registers. Beware that
this may damage your panel, so use this at your own risk. The
default depends on the device.
- Option "PanelWidth"
- Option "PanelHeight"
- Override the flat panel dimensions in pixels. They are used to program the
flat panel registers and normally determined using the video card BIOS. If
the wrong dimensions are used, the system may hang.
- Option "UseFBDev" "boolean"
- Enable or disable use of an OS-specific framebuffer device interface
(which is not supported on all OSs). See fbdevhw(4) for further
information. Default: on for PowerPC, off for other
- Option "DMAForXv" "boolean"
- Try or don't try to use DMA for Xv image transfers. This will reduce CPU
usage when playing big videos like DVDs, but may cause instabilities.
The following additional Options are supported:
- Option "ShowCache" "boolean"
- Enable or disable viewing offscreen cache memory. A development debug
option. Default: off.
- Option "VGAAccess" "boolean"
- Tell the driver if it can do legacy VGA IOs to the card. This is necessary
for properly resuming consoles when in VGA text mode, but shouldn't be if
the console is using radeonfb or some other graphic mode driver. Some
platforms like PowerPC have issues with those, and they aren't necessary
unless you have a real text mode in console. The default is off on
PowerPC and SPARC and on on other architectures.
Dualhead Note: The video BIOS on some laptops interacts
strangely with dualhead. This can result in flickering and problems changing
modes on crtc2. If you experience these problems try toggling your laptop's
video output switch (e.g., fn-f7, etc.) prior to starting X or switch to
another VT and back.
Xorg(1), xorg.conf(5), Xserver(1), X(7)
Rickard E. (Rik) Faith email@example.com
Kevin E. Martin firstname.lastname@example.org