This facility can be used to prevent such uncontrolled GPE floodings. acpi_rsdp= [ACPI, EFI, KEXEC] Pass the RSDP address to the kernel, mostly used on machines running EFI runtime service to boot the second kernel for kdump. acpi_sci= [HW, ACPI] ACPI System Control Interrupt trigger mode Format: acpi_skip_timer_override [HW, ACPI] Recognize and ignore IRQ0/pin2 Interrupt Override. acpi_mask_gpe= [HW, ACPI] Due to the existence of _Lxx/_Exx, some GPEs triggered by unsupported hardware/firmware features can result in GPE floodings that cannot be automatically disabled by the GPE dispatcher. acpi_no_static_ssdt [HW, ACPI] Disable installation of static SSDTs at early boot time By default, SSDTs contained in the RSDT/XSDT will be installed automatically and they will appear under /sys/firmware/acpi/tables. Note that specifying this option does not affect dynamic table installation which will install SSDT tables to /sys/firmware/acpi/tables/dynamic. acpi_pm_good [X86] Override the pmtimer bug detection: force the kernel to assume that this machine's pmtimer latches its value and always returns good values. acpi_no_auto_serialize [HW, ACPI] Disable auto-serialization of AML methods AML control methods that contain the opcodes to create named objects will be marked as "Serialized" by the auto-serialization feature. acpi_osi= [HW, ACPI] Modify list of supported OS interface strings acpi_osi="string1" # add string1 acpi_osi="! # enable all built-in OS vendor strings acpi_osi= # disable all strings 'acpi_osi=! * acpi_osi="Windows 2000"' is equivalent to 'acpi_osi=! acpi_sleep= [HW, ACPI] Sleep options Format: See Documentation/power/for information on s3_bios and s3_mode. MTD MTD (Memory Technology Device) support is enabled. Format: Support masking of GPEs numbered from 0x00 to 0x7f. acpi_os_name= [HW, ACPI] Tell ACPI BIOS the name of the OS Format: To spoof as Windows 98: ="Microsoft Windows" acpi_rev_override [ACPI] Override the _REV object to return 5 (instead of 2 which is mandated by ACPI 6) as the supported ACPI specification revision (when using this switch, it may be necessary to carry out a cold reboot _twice_ in a row to make it take effect on the platform firmware). # disable all built-in OS vendor strings acpi_osi=!! For broken n Force2 BIOS resulting in XT-PIC timer.Everything after “–” is passed as an argument to init. DRM Direct Rendering Management support is enabled. amd_iommu= [HW, X86-64] Pass parameters to the AMD IOMMU driver in the system.Module parameters can be specified in two ways: via the kernel command line with a module name prefix, or via modprobe, e.g.: Parameters for modules which are built into the kernel need to be specified on the kernel command line. DYNAMIC_DEBUG Build in debug messages and enable them at runtime EDD BIOS Enhanced Disk Drive Services (EDD) is enabled EFI EFI Partitioning (GPT) is enabled EIDE EIDE/ATAPI support is enabled. Possible values are: fullflush - enable flushing of IO/TLB entries when they are unmapped.
See For this reason, Apache 2.4 is not available via the standard yum repositories.
This command is useful when one want to control the state of the feature group strings to debug BIOS issues related to the OSPM features. acpi_use_timer_override [HW, ACPI] Use timer override. For some broken Nvidia NF5 boards that require a timer override, but don't have HPET add_efi_memmap [EFI; X86] Include EFI memory map in kernel's map of available physical RAM.
But it may still not able to affect the final state of a string if there are quirks related to this string. sci_force_enable causes the kernel to set SCI_EN directly on resume from S1/S3 (which is against the ACPI spec, but some broken systems don't work without it).
I would give it some time before upgrading - there is a good reason why Cent OS and RHEL wait until the new update is fully tested before releasing it.
I would strongly recommend you wait for a bit before updating.