ATI Mobility Radeon X300
Display on the internal LCD works as long as you set the monitor settings correct.
External VGA port
There are known problems. Both the radeon and fglrx drivers turn off the switching between internal and external port.
With the vesa driver
Using the "vesa" driver built into X.org, mode switching modes. However, this loses acceleration and some capabilities.
With the radeon driver
On-the-fly swiching doesn't work. To activate both ports in clone mode with a reasonable CRT refresh rate, 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 "MonitorLayout" "LVDS, CRT" Option "CRT2Hsync" "50-75" Option "CRT2VRefresh" "50-82" EndSection
Note that without the MonitorLayout option, if the external monitor is connected when X starts then the LCD will be deactivated and you will need to restart X.
(Tested wth Fedora Core 4 on ThinkPad T43).
See also the related discussion about Additional options for the radeon driver.
With the fglrx driver
On-the-fly works with aticonfig in the newest Drivers, see Display Switching. Additionally, to use both ports there is the possibility to either have the monitor connected during X startup, or force activation of both ports by adding
Option "ForceMonitors" "lvds,crt1"
to the Device section in your /etc/X11/xorg.conf. Powering the CRT port consumes 400-500mW, regardless of whether a CRT is attached.
S-Video port (TV-out)
Works with the proprietary fglrx driver (as of version 8.19.10). To activate, add
Option "ForceMonitors" "lvds,tv"
to the Device section in your /etc/X11/xorg.conf and restart X.
OpenGL 3D acceleration is provided by the proprietary fglrx driver (when DRI is enabled). Note that performance is affected by the power saving mode.
The open source r300 DRM module also aims to provide 3D acceleration. This currently requires the CVS/GIT versions of X.org, DRM and Mesa, and has been observed to occasionally crash (e.g., when running Google Earth or ppraceron a T43). You can install it experimentally for testing.
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
|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|
|Mode||core freq||memory freq|
Experimentally, the difference between the Performance and Battery settings under Linux with the radeon driver and 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.
See How to make use of Graphics Chips Power Management features for details on how to control this using Rovclock, DynamicClocks option to the radeon driver and or the fglrx driver.
Presently the lowest idle-mode power consumption is achieved using the proprietary fglrx driver and
# aticonfig --set-powerstate=1 --effective=now
ThinkPads this chip may be found in