Power Management Optimization

Optimize Energy • Extend Battery Life • Reduce Operational Cost

Optimize energy usage. Extend battery life. Reduce operational cost. Our experienced engineers help your team actively manage hardware resources to take advantage of the power efficiency of RISC. Meet your energy budgets, thermal constraints, and sustainability objectives.

At RISCstar, we bring deep expertise in power management for both Linux kernel and Zephyr RTOS — helping your teams optimize dynamically for real-world usage, not just lab conditions.

Stop Needlessly Wasting Power

Power management problems rarely surface cleanly. They compound across the stack and throughout a product’s lifetime. Development teams face challenges such as:

Battery life that falls short of specs due to under-tuned idle and sleep states
Heat and thermal costs that increase time-to-market risk and long-term reliability issues
Performance mismatches, high power draw under light load, or latency penalties under heavy load
Inconsistent behavior across silicon revisions, firmware versions, and OS kernels
Missed sustainability targets and higher operational costs in the field

In our blog “Power Management on Embedded Linux Systems” we explain how embedded Linux platforms often overlook deeper layers of power management — from device-tree tuning to idle-state clustering.

In “Power Management Embedded Linux Dynamic Voltage and Frequency Scaling” we cover how DVFS domains are implemented incorrectly, leaving large savings on the table.

And in “Power Management on Embedded Linux Systems: Idle State Management” shows how idle-state (C-state) management that isn’t aligned with hardware leads to large cumulative losses in battery or energy cost.

These issues are solvable — but only with deep expertise in power management across the full software stack. RISCstar has the experience and expertise to help you solve these issues, delivering measurable improvements to battery life, thermal performance, and long-term operating cost.

Our Expertise: We Understand the Entire Power Stack

Our engineers specialise in the full stack of power management for Linux and Zephyr systems, covering:

Device-tree and topology configuration for PM domains
CPU DVFS, big.LITTLE cluster transitions
Idle-state (C-state) tuning, tick-stop, SO-stop, wake-source mapping
System power domains, regulators, clocks, memory retention and wake logic
Thermal management integration and runtime power constraints
OS power budgeting, latency trade-offs, and real-world workload modelling
Zephyr’s tickless and idle system patterns for ultra-low power embedded use
In-field power monitoring, instrumentation, profiling and long-tail behaviour

This kind of depth ensures your product is power-efficient not only in lab conditions but across varied use cases and lifecycle scenarios.

RISCstar's Approach to Power Management

RISCstar has deep expertise in power management for Linux and Zephyr, and can help with:

We profile your platform under representative workloads, measuring idle behavior, DVFS transitions, wake-source impact, and component-level consumption — then identify the highest-impact hotspots.

We tune DVFS governors for your workload profile and sleep patterns, including big.LITTLE cluster transitions, ensuring the right operating point is selected under real-world conditions.

We map and optimize idle states, align OS timers to reduce wake-ups, and ensure wake-source discipline to maximize time spent in deep sleep across the full system.

We configure device-tree and driver support for power domains, clocks, regulators, and memory retention — integrated with thermal management and runtime power constraints.

We enable CPU idle states, wake-up events, and sleep-entry using Zephyr’s low-power OS features.

We deploy instrumentation to validate energy savings and produce reports tied to your product KPIs. We align test harnesses with CI behavior and embed power-aware workflows into your long-term board bring-up and maintenance.

Our Approach: Methodical & Results-Driven

Initial Audit & Baseline Profiling

We begin by profiling your platform under representative workloads, measuring idle behaviour, DVFS transitions, wake-source impact, memory retention leakage and component-level consumption. We compare against expected product energy envelopes and identify hotspots

Re-tailor device-tree and driver support for power domains, clocks and regulators
Tune DVFS governors for your workload profile and sleep/pause patterns
Map and optimize idle states, ensure wake-source discipline, align OS timers and tickless behaviour Integrate thermal, battery-fuel gauge and runtime power constraints
For Zephyr: enable CPU idle states, wake-up events, and sleep-entry using low power OS features

We deploy instrumentation (RCM/DAQ, power‐mon adapters, on-board sensors) to validate energy savings, cycle count, and produce reports with pass/fail criteria tied to your product KPIs. We also align test harnesses with nightly/CI behaviour for sustained optimisation.

We help embed power-aware workflows into your board bring-up, SOC enablement, and long-term maintenance. That includes regression tracking, upstream kernel/Zephyr patch integration, power-budget dashboards and night-time telemetry where appropriate.

Proven Experience

Optimised battery life by 35% on a wearable device by realigning idle states and reducing wake-source noise
Delivered server-platform power reduction of 18% under idle and low-utilisation by tuning DVFS and C-states
Ported Zephyr low-power modes to custom SoC and enabled 10× longer sleep times in an IoT sensor network
Upstreamed power-related kernel improvements for a major SoC vendor, reducing maintenance burden and achieving earlier mainline release readiness

We are active contributors in both the Linux kernel power subsystem and the Zephyr energy domains — and our blog archives serve as published thought-leadership in this field.

Why RISCstar? Proven Experience Across Platforms

Our engineers don’t just use the Linux kernel power subsystem — they contribute to it. That upstream depth means we can trace any power problem from hardware through firmware to OS with surgical precision. That translates directly to client results like:

Optimized battery life by 35% on a wearable device by realigning idle states and reducing wake-source noise
Delivered 18% power reduction on a server platform under idle and low-utilization conditions by tuning DVFS and C-states
Upstreamed power-related kernel improvements for a major SoC vendor, reducing long-term maintenance burden and accelerating mainline readiness
Ported Zephyr low-power modes to a custom SoC, enabling 10× longer sleep times in an IoT sensor network

RISCstar is the partner you want when power targets are on the line — because we’ve solved these problems before.

Why RISCstar?

Dual-stack expertise (Linux + Zephyr) across embedded, edge and server domains
Deep hardware-aware power engineering (regulators, clocks, memory, SoC topology)
Proven approach linking product KPIs (battery life, TCO, thermal envelope) to software optimisations
Knowledge transfer built in — your team upgrades while your product reduces cost
Upstream and community ties — enabling early access and long-term sustainability

RISCstar, Your Partner For Success

If you have:

We have extensive experience resolving these scenarios and are here to help.

Power Management Optimization

Stop Needlessly Wasting Power

Our Expertise: We Understand the Entire Power Stack

RISCstar's Approach to Power Management

Initial Audit & Baseline Profiling

DVFS & CPU Frequency Optimization

Idle State Tuning

System Power Domains & Thermal Integration

Zephyr Low-Power Enablement

Verification, Validation & Sustained Optimization

Our Approach: Methodical & Results-Driven

Optimization & Implementation

Verification & Validation

Sustainability & Support

Proven Experience

Why RISCstar? Proven Experience Across Platforms

Why RISCstar?

RISCstar, Your Partner For Success