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The "log_buf_len" parameter may be useful if you need to capture more output. Enable processor driver info messages: acpi.debug_layer=0x20000000 Enable PCI/PCI interrupt routing info messages: acpi.debug_layer=0x400000 Enable AML "Debug" output, i.e., stores to the Debug object while interpreting AML: acpi.debug_layer=0xffffffff acpi.debug_level=0x2 Enable all messages related to ACPI hardware: acpi.debug_layer=0x2 acpi.debug_level=0xffffffff Some values produce so much output that the system is unusable. This option is useful for developers to identify the root cause of an AML interpreter issue when the issue has something to do with the repair mechanism.
align_va_addr= [X86-64] Align virtual addresses by clearing slice  when allocating a VMA at process creation time.
The following is a consolidated list of the kernel parameters as implemented by the __setup(), core_param() and module_param() macros and sorted into English Dictionary order (defined as ignoring all punctuation and sorting digits before letters in a case insensitive manner), and with descriptions where known. 32: only for 32-bit processes 64: only for 64-bit processes on: enable for both 32- and 64-bit processes off: disable for both 32- and 64-bit processes alloc_snapshot [FTRACE] Allocate the ftrace snapshot buffer on boot up when the main buffer is allocated.
The kernel parses parameters from the kernel command line up to “–”; if it doesn’t recognize a parameter and it doesn’t contain a ‘.’, the parameter gets passed to init: parameters with ‘=’ go into init’s environment, others are passed as command line arguments to init. This is handy if debugging and you need to use tracing_snapshot() on boot up, and do not want to use tracing_snapshot_alloc() as it needs to be done where GFP_KERNEL allocations are allowed.
modprobe looks through the kernel command line (/proc/cmdline) and collects module parameters when it loads a module, so the kernel command line can be used for loadable modules too. EVM Extended Verification Module FB The frame buffer device is enabled. Otherwise they are flushed before they will be reused, which is a lot of faster off - do not initialize any AMD IOMMU found in the system force_isolation - Force device isolation for all devices.
Hyphens (dashes) and underscores are equivalent in parameter names, so: where the final item represents CPUs 100,101,125,126,150,151,... The IOMMU driver is not allowed anymore to lift isolation requirements as needed.