I am trying to understand how to use conf file in /etc/modprobe.d/. For instance on my system I define:
$ cat /etc/modprobe.d/nouveau.conf # debug nouveau options nouveau debug="PGRAPH=debug" After a shutdown followed by a fresh start here is what I see:
$ dmesg | grep nouveau [ 1.495465] [drm:nouveau_drm_init [nouveau]] Loading Nouveau with parameters: [ 1.495490] [drm:nouveau_drm_init [nouveau]] ... tv_disable : 0 [ 1.495515] [drm:nouveau_drm_init [nouveau]] ... ignorelid : 0 [ 1.495539] [drm:nouveau_drm_init [nouveau]] ... duallink : 1 [ 1.495563] [drm:nouveau_drm_init [nouveau]] ... nofbaccel : 0 [ 1.495587] [drm:nouveau_drm_init [nouveau]] ... config : (null) [ 1.495611] [drm:nouveau_drm_init [nouveau]] ... debug : PFIFO=debug Which is confirmed by:
$ sudo cat /sys/module/nouveau/parameters/debug PFIFO=debug So it looks like upon startup the nouveau module is reading from another location the debug option (since PGRAPH != PFIFO). Where is this alternate file stored ? How do I find out which one is used ?
1 Answer
nouveau is starting from initramfs.
To change load options for this kind of modules you need to run
sudo update-initramfs -u to get the setting applied.
