ATI Mobility Radeon X300

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ATI Mobility Radeon X300

This is a ATI video adapter


  • Chipset: ATI M22
  • PCI ID: 1002:5460
  • PCI Express x16
  • 32 or 64MB GDDR1 on-chip video memory
  • "HyperMemory": can use system memory for graphics processing
  • "PowerPlay 4.0" technology for dynamic engine cloc, memory clock and core voltage, refresh rate reduction and thermal status reporting.

See specifications from ATI, as well as the "snapshot" data sheet (referes to the 32MB on-chip, 128MB "HyperMemory" version).

Linux driver

Use Driver "radeon" in the xorg.conf file - it works at least for xorg 6.8.2, maybe older versions too. Currently (as of xorg 6.8.2) this will only give you 2D-acceleration, though. To enbable 3D acceleration as well you need to use the binary ATI driver fglrx.

There is also an open source Radeon driver with 3D acceleration support (merged into here recently), but it's still highly experimental and does not support all features.

ThinkPad LCD

Display on the internal LCD works as long as you set the monitor settings correct.

External VGA port

There are known problems. The driver from ATI turns off the switching between internal and external port.

To make switching with, use the "vesa" driver built into instead of the ATI or "radeon" drivers. This loses acceleration and some capabilities.

Alternatively, start X without an external monitor, and then connect the external monitor. Both displays will be active, and cannot be switched off until you exit X. Note that if the external monitor is connected when X starts, the LCD will be deactivated and you will need to restart X. To have a reasonable refresh rate on the external monitor (the default is the LCD's 50Hz), use the following in /etc/X11/xorg.conf:

Section "Device"
	Identifier  "Videocard0"
	VendorName  "Videocard vendor"
	BoardName   "ATI Radeon Mobility X300"

	Driver      "radeon"
	Option      "DynamicClocks" "on"

	Option      "MergedFB" "on"
	Option      "CRT2Hsync" "50-75"
	Option      "CRT2VRefresh" "30-82"

(Tested wth Fedora Core 4 on ThinkPad T43).

See also the related discussion about Additional options for the radeon driver.

S-Video port (TV-out)

Linux support status is unknown.

There is some generic advise here about making it work using the proprietary Fglrx driver.

DVI port


Proprietary ATI driver

The fglrx driver adds 3D acceleration.

Linux kernel Framebuffer driver

radeonfb might cause problems with hardware acceleration under X on some systems, vesafb and vesafb-tng on the other hand has been reported to work just fine.

Clock rates, voltage and power

Clock rates, voltages and power 1
Mode core freq memory freq voltage idle 3DMarks (Windows, 1600x1200, LCD only)
Performance 300 230 MHz 1.15V 2.98 W 8.28 W
Balanced 183 210 MHz 1.00V 1.71 W 3.88 W
Battery 120 105 MHz 1.00V 1.61 W 2.74 W

ATI driver for Windows 2
Mode core freq memory freq
Performance 297.00 229.50
Balanced 209.25 182.25
Battery 104.63 121.50

Experimentally, the difference between the Performance and Battery settings under Linux with DynamicClocks enabled is roughly 0.3W and 3-4 degrees in GPU temperature on a ThinkPad T43. Further frequency reduction leads to display flickering or corruption.

Clock rates can be changed through Rovclock, and are also affected by the DynamicClocks option to the radeon driver.

ThinkPads this chip may be found in

  1. according to the "Snapshot" data sheet (which refers to the 32MB on-chip, 128MB "HyperMemory" version)
  2. inspected using Notebook Hardware Control