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Fan speed on the cooling page remains at 100 % after booting into the operating system when using iDRAC10 1.20.80.51 or older. Clock stretching on the I2C bus causes response times to exceed specifications and results in time‑outs. Other devices on the I2C bus may experience communication problems due to the clock‑stretching events.
The root cause of the issue is an I2C communication fault in iDRAC 10 firmware versions 1.20.80.51 and older. This defect affects the I2C controller handling of Kioxia CM6 NVMe drives on 17G servers. Clock‑stretching events occur on the I2C bus, causing response times to exceed specification limits. Extended response times trigger time‑outs, leading to communication failures for the NVMe drives, and other devices sharing the I2C bus. Repeated clock‑stretching can destabilize the backplane, risking loss of connectivity for all attached drives.
Upgrade iDRAC Firmware to 1.30.10.50 or Newer to Resolve I2C Communication and Fan Speed Issues. iDRAC 1.30.10.50 will be available to download late March 2026.
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