Known issues

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.

Kernel and boot

Table: Kernel and boot known issues

Issue	Description	Workaround
First boot after flash may be slow	The 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.

Real-time kernel

Table: Real-time kernel known issues

Issue	Description	Workaround
High worst-case latency on first run	The 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.

Device tree

Table: Device tree known issues

Issue	Description	Workaround
DTB mismatch after kernel upgrade	Flashing 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.

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.

⌘I

Introduction

Architecture

Key Documents

Technologies

System

Release Notes

Kernel and boot

Real-time kernel

Device tree

Report an issue

​Kernel and boot

​Real-time kernel

​Device tree

​Report an issue

Kernel and boot

Real-time kernel

Device tree

Report an issue