ttm: Automatically regenerate initramfs when TTM configuration changes by daissi · Pull Request #35 · superm1/amd-debug-tools

daissi · 2026-04-27T13:52:14Z

When modifying TTM configuration via modprobe, the changes won't take effect until the next reboot. However, if the ttm module is loaded during early boot (e.g., in initramfs), the new configuration won't be applied unless the initramfs is regenerated.

This commit adds functionality to:

Check if the ttm module is included in existing initramfs images
Detect the system's initramfs generation tool (update-initramfs, dracut, or mkinitcpio)
Automatically regenerate the initramfs if needed after modifying TTM configuration

This ensures that TTM configuration changes are properly applied during the next reboot, even when the module is loaded from initramfs.

Please note that this has only been tested on a Debian system.

superm1 · 2026-04-27T14:04:41Z

+    try:
+        # Run lsinitramfs and search for "ttm" in the output
+        result = subprocess.run(
+            ["lsinitramfs", initramfs_path],


do you know if this works with initramfs images built with dracut?

I've just tried it and it works.

Okay - besides it working is it present in systems that only use dracut? Like on Fedora for example

superm1

Can you add some unit tests that mock some behaviors of the tools?

codecov · 2026-04-27T14:07:59Z

Codecov Report

❌ Patch coverage is 41.17647% with 30 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.61%. Comparing base (720acec) to head (7cc69fa).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/amd_debug/ttm.py	41.17%	27 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #35      +/-   ##
==========================================
- Coverage   85.90%   85.61%   -0.30%     
==========================================
  Files          34       34              
  Lines        7693     7744      +51     
  Branches      724      731       +7     
==========================================
+ Hits         6609     6630      +21     
- Misses        871      898      +27     
- Partials      213      216       +3

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When modifying TTM configuration via modprobe, the changes won't take effect until the next reboot. However, if the ttm module is loaded during early boot (e.g., in initramfs), the new configuration won't be applied unless the initramfs is regenerated. This commit adds functionality to: 1. Check if the ttm module is included in existing initramfs images 2. Detect the system's initramfs generation tool (update-initramfs, dracut, or mkinitcpio) 3. Automatically regenerate the initramfs if needed after modifying TTM configuration This ensures that TTM configuration changes are properly applied during the next reboot, even when the module is loaded from initramfs. Signed-off-by: Dylan Aïssi <dylan.aissi@collabora.com>

superm1 reviewed Apr 27, 2026

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