Owners Manual

Cause: DMAR on g4x/gm45 graphic processing unit is not fully supported.
Workaround: Use “intel_iommu=igfx_off” kernel parameter to avoid errors.
Xserver crashe, while booting Red Hat Enterprise Linux 6.5
after installation
Description: During the rst boot of Red Hat Enterprise Linux 6.5 on Windows 2012 R2 Virtual Machine, the Xserver crashes.
Cause: The vesa driver is used instead of hyperv_fb driver during the installation.
Workaround: Remove the string “xdriver=vesa ” from kernel boot parameters during installation.
Invalid naming conventions for the ports of Vindicator 2
Emulex card when NPAR-EP is enabled
Description: Red Hat Enterprise Linux 6.5 with Emulex card naming conventions by biosdevname may not be accurate for all
the networking devices. As a result partitions 3 and 4 of all the four ports of Emulex is not named as expected.
Cause: Biosdevname has the Limitation, which cannot handle more than 7 PCI functions.
Workaround: Add kernel boot parameter “biosdevname=0” this return back to ethN naming.
NVMe Devices Are Not Identied During Operating System
Installation
Description
When installing Red Hat Enterprise Linux 6.5, the NVM express devices are listed as unknown data storage devices
in the installer.
Cause The vendor and model name for the NVMe devices are not identied by the installer.
Red Hat Enterprise Linux 6 fails when the DSDT in the BIOS
has IPMI Opregion enabled
Description
dmesg displays the following ACPI-IPMI related error messages on system startup:
[ 4.724118] ACPI Error: No handler for Region [IPMI] (ffff880c04d8c240) [IPMI]
(20110623/evregion-373)
[ 4.724122] ACPI Error: Region IPMI (ID=7) has no handler (20110623/
exfldio-292)
Workaround There is no functionality loss.
Cause The DSDT feature is enabled in BIOS as per ACPI 4.0 specications. Platforms that require IPMI Opregion enabled
in BIOS for Power Meter usage display the ACPI error messages. The kernel does not have handlers to support the
methods in IPMI Opregion.
20 Installation instructions and important information