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Debian

Talking to Grid Control

And suddenly, Firefox did not want to connect to Oracle Grid Control anymore.

The error message displayed was Cannot communicate securely with peer: no common encryption algorithm(s). (Error code: ssl_error_no_cypher_overlap). Google was not immediately useful (suggesting things like turning off SSL).

Lenovo E145: Backlight

Symptoms

The backlight brightness of an Lenovo E145 laptop with a Radeon HD 8240 graphics controller can not be adjusted on Debian. Neither the Fn-F7/Fn-F8 keys are working nor any other interface.

Solution

Force the use of the kernel Radeon driver by installing the (non-free) Radeon firmware.

Background

There are several drivers that may be used by the Linux kernel and the X Windows System. The trick is forcing the correct one, as not all drivers support the backlight.

Virtual Debian

I have been trying to get old versions of Debian to run as virtual machines. Most of it works without trouble, but there are some things you should be aware of, if you want to try it yourself.

My host is a Debian Wheezy machine running Linux kernel 3.11 and Qemu/KVM 1.1.2, using Virtual Machine Manager (virt-manager) 0.9.1.

Releasing old software

After a long, long time, I decided to release a new version of psiconv. That is tooling I wrote between ten and fifteen year ago. In those days I owned a Psion 5 (and later the upgraded model, the Psion 5MX), a small PDA with keyboard running EPOC (also known as EPOC32, a precursor of Symbian).

Lenovo E145: Wireless network

Symptoms

The wireless network adapter on Lenovo E145 laptops is not supported out of the box on Debian. Though you can see the PCI device (using lspci), you do not have a wireless interface (as checked with ifconfig -a, for example).

Sendmail: Using TLS for authentication

Symptoms

You have a laptop or other mobile device running Debian. You have your own Sendmail server, also running Debian. You want to send email from your laptop, but your Sendmail server does not accept your emails if you are not on your local network.

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by Dr. Radut