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Nouveau driver not loaded

Tue, 04/07/2020 - 12:44

After experiencing some X11-crashes, it turns out that X11 was using the modesetting driver instead of Nouveau. For some reason my Debian configuration was not selecting the driver I needed.

If you inspect your X log-file (usually /var/log/Xorg.0.log) and look for Modeline entries, the log lines will start with modeset(0) if you are using the modeset driver, and with NOUVEAU(0) if you are using the Nouveau driver.

Firefox: You've launched an older version

Thu, 11/14/2019 - 17:58

After upgrading my workstation to buster, Firefox insisted on creating a new profile:

The new version was 68.2, the old version too, but Firefox kept complaining.

The solution: create a new profile, close Firefox and compare ~/.mozilla/firefox/*/compatibility.ini. Copy the LastVersion setting from your new to your old profile. Now Firefox is happy to use your old profile again.

Talking to Grid Control

Tue, 04/14/2015 - 19:41

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

Tue, 03/24/2015 - 11:23

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

Wed, 10/22/2014 - 13:10

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

Wed, 10/22/2014 - 12:20

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).

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by Dr. Radut