glyn

X crashes on resume

This gist captures debugging information about a crash that has been happening relatively recently on my arch system.

See my distro-hopping history for more context.

The symptoms are that X crashes on resume. If I issue startx again, then there seem to be issues using the USB mouse, so I suspect some USB mouse problem is responsible for the crash.

Diagnostics

glyn

Glyn Normington
Prove pythagoras's theorem.

Pythagoras's theorem states that in a right triangle (a triangle with one 90 degree angle), the square of the length of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the other two sides. This can be written as:

a^2 + b^2 = c^2

where a and b are the lengths of the other two sides of the triangle, and c is the length of the hypotenuse.

Here is a proof of this theorem using Euclidean geometry:

glyn

(The following overlooks my early use of Red Hat Linux, on a Thinkpad, around the turn of the century and my repeated use of Ubuntu in VMs since then.)

The NVIDIA GK106GL [Quadro K4000] graphics card seems to cause crashes on various distros. Here's the checkered history of my desktop machine:

• Ubuntu crash on suspend/resume.
• Fedora 35 The nouveau driver occasionally crashes and locks up the desktop, requiring a power off.
• Fedora 35 installed nvidia 470 driver.
• Fedora 36 beta.

glyn

Here's a list of topics I think would benefit some CompSci or Software Engineering undergraduate degrees. Which of these are already covered really well by some universities? Comments welcome here or on this Mastodon thread.

1. Version control
   • Theory
   • Branching and merging
   • Centralised and distributed VCS
   • Collaboration models
   • Commit logs
   • Debugging

• git

glyn

This is an OpenPGP proof that connects my OpenPGP key to this Github account. For details check out https://keyoxide.org/guides/openpgp-proofs

[Verifying my OpenPGP key: openpgp4fpr:FINGERPRINT]

glyn

Context: https://askubuntu.com/questions/1371055/ubuntu-21-10-resume-produces-blank-screen How to debug: https://wiki.ubuntu.com/DebuggingKernelSuspend Did this and found the following in dmesg output:

[    1.322162] PM:   Magic number: 0:486:890
[    1.322167] PM:   hash matches drivers/base/power/main.c:905
[    1.322237] pci 0000:00:1f.3: hash matches

lspci contained:

glyn

Superseded by a book.

glyn

echo '["a"]' | ./src/wrap_in_docker.sh ./src/one_off.sh '$[0,0]'
Sending build context to Docker daemon  75.26kB
Step 1/24 : FROM ubuntu:20.10
...
Step 24/24 : RUN apt-get install -y --no-install-recommends ruby
 ---> Using cache
 ---> 25adaf4f6bcb
Successfully built 25adaf4f6bcb
Successfully tagged json-path-comparison:latest
[1/4] (cd implementations/Bash_JSONPath.sh && npm install) && echo > implementations/Bash_JSONPath.sh/build/node_modules_installed

glyn

This is a short, fun series of articles on some of the parts of Rust that newcomers find most confusing. Thanks @eeeeeta for taking the time to make things clearer!

• Learn You a Rust for Great Good
• Learn You a Rust II - References and Borrowing
• Learn You a Rust III - Lifetimes 101
• Learn You a Rust IV - Lifetime Fenangling

Doubtless the title was inspired by Learn You Some Erlang for Great Good! and Learn You a Haskell for Great Good!.

glyn

$ ./sheaf init --bundle-path scratch/example --bundle-name example
$ ./sheaf manifest add --bundle-path scratch/example -f scratch/deployment.yaml
Adding manifest from scratch/deployment.yaml
$ cat scratch/deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: sample-deployment
spec:
  template: