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Qualcomm® Linux kernel known issues and their workarounds for the current release are listed below, organized by subsystem.
To see the current list of open issues and their status, see the Qualcomm Linux release notes - Introduction.

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Kernel and boot

Table: Kernel and boot known issues
IssueDescriptionWorkaround
First boot after flash may be slowThe first boot after flashing a new image may take longer than subsequent boots as the firmware performs one-time initialization.Wait up to two minutes. The issue does not recur on subsequent boots.

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Real-time kernel

Table: Real-time kernel known issues
IssueDescriptionWorkaround
High worst-case latency on first runThe first cyclictest run after boot may show elevated worst-case latency due to CPU frequency ramp-up and thermal settling.Run the RT tuning script before the test and discard the first run’s results. See RT kernel fundamentals.

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Device tree

Table: Device tree known issues
IssueDescriptionWorkaround
DTB mismatch after kernel upgradeFlashing a new kernel without updating the DTB partition can cause boot failures if new DT bindings are required.Always flash the kernel and DTB together. See Build and deploy DTBs.

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Report an issue

To report a new issue, use the Qualcomm developer support portal or file a bug in the project tracker. Include the following information in the report:
  • Kernel version: run uname -r on the target.
  • Board and SoC: run cat /proc/device-tree/compatible on the target.
  • Reproduction steps and the relevant dmesg output.