gizmo

ThinkPad X270 RAM upgrade

Since 32 GiB SO-DIMMs are cheap at the moment, I decided to try an upgrade my ThinkPad X270 from it’s current 16 GiB RAM to 32.

ThinkPad x230

In February 2013, I got a new work laptop. It’s a Lenovo ThinkPad x230.

These are my installation notes.

Fedora 16 - Huawei E17X - udev rule

SMS reception while online

Wanting to be able to use gnokii while I have a connection open with ModemManager, I created the following udev rules in /etc/udev/rules.d/98-pcfe-modem.rules

TPM to feed random number generator

One of the uses of a TPM is to feed /dev/random on your linux box. I will not go into the political implications of TPM.

See also Matt Domsch’s blog.

Those still running RHEL5/CentOS5, be sure to have rng-utils-2.0-4 or later and kernel-2.6.18-238.el5 or later.

Some of the following steps are specific to my HP ProLiant MicroServer, but most will apply to any modern linux and HW (one would prefer the TPM to be an integral part of the motherboard as opposed to a module).

apcupsd on RHEL5 / CentOS5

While the current Smart-UPS (aka SMT) range of UPS from APC has much fewer variables exposed in a way that is useful for fancy apcupsd usage (you’ll find apcupsd in EPEL), they are still amply sufficient for home use. Basically, the UPS gives an estimated time left at current load and the remaining battery level. At home these are anyway the only two readings I want to trigger scripts on.