Tag: linux

If you make changes to /etc/profile and want them to take effect immediately without rebooting, run the script using . ./profile (assuming the file has execute flag set, if not chmod +x profile to set it).

Use this command to add an ip address to be blocked by iptables:

<code>
iptables -I INPUT -s x.x.x.x -j DROP
iptables -I INPUT -s x.x.x.x -j LOG
</code>

This example inserts a rule at the top of the table to block all incoming requests from ip x.x.x.x, and then inserts a second rule at the top to first log any connection attempts from this address (before they are blocked).

To see what rules are currently configured, use: iptables -L

For more info, see this entry in the O’Reily Linux Hacks book.

To enable sleep mode on a laptop with Ubuntu, edit the /etc/default/acpi-support file and uncomment the ACPI_SLEEP line at the top of the file which is commented out by default.

Download the ATI Radeon drivers ‘fglrx’ from the Synaptic Package Manager.

Edit /etc/X11/xorg.conf:

Add to ‘Section “Module”‘: Load “GLCore”

In ‘Section “Device”‘ change “ati” to “fglrx”

After restaring, check output in glxinfo – direct rendering should be ‘yes’ and ‘renderer string’ should show ‘MOBILITY/RADEON 9000 DDR Generic’

Initially I had errors running glxinfo – this post here explains the problem and provides a fixed (older?) .so file to replace one in the lates fglrx dirver.