Red Hat ENTERPRISE LINUX 5.5 - TECHNICAL NOTES Manual page 136

Chapter 1. Package Updates
A problem was found in cpufreq_get which sometimes causes a kernel panic on HP DL785-G6
machines running Red Hat Enterprise Linux 5.3 and 5.4.
This update addresses the problem that was occurring and this kernel panic no longer occurs.
• [FIPS140-2] Provide option to disable/enable use of the first random block.
• [FIPS140-2] Do not use the first n-bit block generated after power-up, initialization, or reset.
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• thinkpad_acpi: Disable ecnvram brightness.
The brightness of the screen needed to be manually set using the "Fn + Home" key combination
every time you reboot an IBM T43 laptop, using the Intel Corporation Mobile 915GM/GMS/910GML
Express Graphics Controller (rev 03). This problem was traced to the fact that the thinkpad_acpi
CMOS NVRAM (7) and EC (5) did not agree on the display brightness level.
This update addresses this problem and the screen now always starts at the highest brightness
setting.
• pciehp: Fix PCI-E hotplug slot detection.
A problem was found where the PCI-E hotplug slot was not detected by the pciehp driver on
some platforms. The cause of this problem was traced to a bug in the pciehp driver. This update
addresses this bug and PCI-E hotplug slots are now detected correctly.
• Fix NULL pointer dereference in pci_bus_show_cpuaffinity()
A problem was found where reading /sys/class/pci_bus/0000:ff/cpuaffinity (using
cat or a similar function) would cause the kernel to crash and the system to reboot. This update
provides a solution to this problem.
• Fix device detach and hotplug with iommu=pt
A problem was found with iommu=pt mode for intel_iommu where if you are using iommu=pt and
you assign a device to a KVM guest and then de-assign it,the result is a device which is not usable
in the host. It can be re-assigned to other guests again, but not directly used in the host.
There is also an issue where with iommu=pt any PCI devices that are hot-plugged in the host cannot
be used.
This update provides a solution to the above problems.
• [firewire] fw-ohci: Fix IOMMU resource exhaustion.
• Support AMD Magny-Cours power-aware scheduler fix.
• Fix CPU llc_shared_map information.
• [cpufreq] Add option to avoid smi while calibrating.
The CPU frequency (cpu_khz) was infrequently calculated as larger value than the CPU's
specification in both Red Hat Enterprise Linux 5.1(x86) and 5.2(x86). This also contributed to the
system time being gradually delayed. This update adds an option to avoid this problem.
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