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Cisco Bug: CSCur58188 - i2c clk line read errors logged by PFM

Last Modified

Jun 09, 2020

Products (1)

  • Cisco Nexus 3000 Series Switches

Known Affected Releases

6.0(2)U1(2.155) 6.0(2)U1(2.157)

Description (partial)

Symptom:i2c read failure kernel messages logged in syslog.  

PFM: nuova_sys_i2c_read_byte_data failed for QS_PCA9539_INST_0 I2C_PCA9539_CMD_IN1: rc = -14 - kernel
PFM: detect_lc_module_presence() returned error -14 - kernel
PFM: Error while trying to service 0x2aa, err=-14 - kernel


In some cases,  FAN and PSU might show failed but will be functioning as expected. 

No known impact to regular port detection and data traffic.

Conditions:known to trigger from  QSA's or QSFP's.  not fully secured to the port or may be seen when connected in a particular position.
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