{"node_id": "f3c2686e-2f95-11f1-82b5-e86a64d24d78", "revisions": [{"id": "f3c30c4e-2f95-11f1-b5b4-e86a64d24d78", "node_id": "f3c2686e-2f95-11f1-82b5-e86a64d24d78", "user_id": "edc3f576-2f95-11f1-900f-e86a64d24d78", "author": "foxhop", "data": "Grub2 ubuntu add kernel parameters that survive updates\r\n=============================================================\r\n\r\nIf your Ubuntu Kernel is updated your kernel parameters will be lost.  In my case one of my IBM systems will not boot unless *iommu=soft* exists as a kernel boot parameter. To make this change survive after kernel updates do the following.\r\n\r\nedit **/etc/default/grub** and add the entry to **GRUB_CMDLINE_LINUX_DEFAULT**:\r\n\r\n.. code-block:: grub\r\n\r\n GRUB_CMDLINE_LINUX_DEFAULT=\"quiet splash iommu=soft\"\r\n ", "source_format": "rst", "revision_number": 1, "created": 1352822275000}], "count": 1}