Operational Defect Database
BugZero found this defect 3273 days ago.
Data sources
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Hewlett Packard Enterprise | c04704148
Advisory: Linux - the Linux pcc-cpufreq Driver May Fail to Load When HP Dynamic Power Savings Mode Is Enabled
Last update date:
2/24/2024
Affected products:
HPE ProLiant BL280c G6 Server Blade
HPE ProLiant BL2x220c G6 Server Blade
HPE ProLiant BL460c G6 Server Blade
HPE ProLiant BL460c Gen8 Server Blade
HPE ProLiant BL460c Gen9 Server Blade
HPE ProLiant BL465c G6 Server Blade
HPE ProLiant BL490c G6 Server Blade
HPE ProLiant BL495c G6 Server Blade
HPE ProLiant BL660c Gen8 Server Blade
HPE ProLiant BL685c G6 Server Blade
HPE ProLiant DL160 G6 Server
HPE ProLiant DL160 Gen8 Server
Affected releases:
No affected releases provided.
Fixed releases:
No fixed releases provided.
Description:
Info
With HP Dynamic Power Savings Mode enabled and under certain conditions platform firmware (BIOS) may return a processor frequency of zero to the Linux pcc-cpufreq driver. This may cause the driver to fail to load either for all processors or for a single processor. To determine the current Linux power management driver status the command "cpupower -c all frequency-info" or the command "cpufreq-info -c all" can be executed. In both cases the output will list the currently loaded driver or indicate no driver was loaded. For example, using the "cpupower" utility to check the status of processor 0 in the case where the pcc-cpufreq driver is not loaded the output would display the following: In the case where a Linux power management driver is loaded the output would be similar to the following:
Scope
Any HP ProLiant G6, G7, Gen8, or Gen9-series server running Linux.
Resolution
Change the HP Power Regulator setting to OS Control Mode in the ROM-Based Setup Utility (RBSU) as follows: During Power-On Self-Test (POST), Press F9 to Enter the ROM Based-Setup Utility (RBSU). Select the Power Management Options menu. Select HP Power Regulator . Select the OS Control Mode . Press F10 to Save and Exit. Figure 1: HP Power Regulator setting at OS Control Mode in the RBSU. RECEIVE PROACTIVE UPDATES : Receive support alerts (such as Customer Advisories), as well as updates on drivers, software, firmware, and customer replaceable components, proactively via e-mail through HP Subscriber's Choice. Sign up for Subscriber's Choice at the following URL: Proactive Updates Subscription Form NAVIGATION TIP : For hints on navigating HP.com to locate the latest drivers, patches, and other support software downloads for ProLiant servers and Options, refer to the Navigation Tips document . SEARCH TIP : For hints on locating similar documents on HP.com, refer to the Search Tips document . To search for additional advisories related to Linux, use the following search string: +Advisory +ProLiant -"Software and Drivers" +Linux
