Incident: iPhone 6S Battery Percentage Display Bug Impacting Users' Perception.

Published Date: 2016-01-18

Postmortem Analysis
Timeline 1. The software failure incident with the iPhone 6S battery percentage bug happened in September when the iPhone 6S and 6S Plus were released [39699]. 2. The incident was reported in an article published on January 18, 2016 [39699, 39585]. Therefore, the software failure incident with the iPhone 6S battery percentage bug occurred in September 2015.
System 1. iOS software on iPhone 6S and 6S Plus [39699, 39585]
Responsible Organization 1. Apple [39699, 39585]
Impacted Organization 1. iPhone 6S and 6S Plus users [39699, 39585]
Software Causes 1. Bug in the iOS software causing the battery percentage icon to inaccurately update on iPhone 6S and 6S Plus [39699, 39585] 2. Issue related to the iPhone's clock and time zone changes affecting the battery meter update [39699, 39585]
Non-software Causes 1. Changing the system time or date manually on the iPhone (Article 39699) 2. Moving between time zones (Article 39585)
Impacts 1. The software failure incident with the iPhone 6S and 6S Plus battery meter bug led to the incorrect display of battery percentage, causing some users to believe they had more battery power remaining than they actually did [39699, 39585]. 2. Users experienced iPhones shutting down while still displaying a full charge due to the bug in the battery meter that failed to update the percentage displayed [39585]. 3. The issue was particularly affecting users who had recently traveled through several time zones or manually adjusted the time on their devices, leading to confusion and potential inconvenience [39699, 39585]. 4. Apple advised affected users to restart their iPhones and enable the automatic time setting within the "Date & Time" settings as a temporary solution until a fix was implemented [39699, 39585]. 5. The bug highlighted the importance of accurate time and date settings in Apple devices, as previous issues related to time adjustments had caused problems such as broken alarms and crashing smartphones [39585].
Preventions 1. Implementing thorough testing procedures for time and date-related changes in the software to catch any potential bugs before release [39699, 39585]. 2. Conducting more extensive user testing to identify any edge cases or scenarios that could trigger the battery percentage display bug [39699, 39585]. 3. Providing clearer user guidelines or warnings regarding the potential impact of manually adjusting the time on the device [39699, 39585]. 4. Ensuring prompt communication with users about the issue and providing interim solutions or workarounds while a permanent fix is being developed [39699, 39585].
Fixes 1. Restarting the iPhone and enabling the automatic time setting within the "Date & Time" settings [39585]. 2. Apple pushing out a fix in the next iteration of its iOS software [39699].
References 1. Apple - The articles gather information about the software failure incident from Apple itself, as the company admitted to the bug and is working on a fix [39699, 39585]. 2. Reddit - Information about user experiences and workarounds for the software issue was gathered from Reddit, where a user shared their personal experience with the battery percentage bug [39699].

Software Taxonomy of Faults

Category Option Rationale
Recurring one_organization (a) The software failure incident related to the battery percentage display issue on iPhone 6S and 6S Plus has happened again at Apple. This incident is not the first time Apple has faced software bugs related to time and date settings on its devices. In the past, there have been issues with automatic daylight savings adjustments breaking alarms, a do not disturb bug in 2013, and a bug in text handling that could crash the iPhone with an SMS message [39699, 39585]. (b) There is no information in the provided articles about the software failure incident happening at multiple organizations or with their products and services.
Phase (Design/Operation) design, operation (a) The software failure incident related to the design phase is evident in the articles. Apple's iOS software had a bug that caused the battery percentage icon on iPhone 6S and 6S Plus to inaccurately update. This issue was linked to the iPhone's clock and particularly affected users who manually adjusted the time on their devices or traveled through different time zones. The bug was acknowledged by Apple, and they were investigating the cause and a solution [39699, 39585]. (b) The software failure incident related to the operation phase is also highlighted in the articles. Users experienced the battery meter failing to update the percentage displayed correctly, leading to iPhones shutting down while still showing a full charge. This issue occurred when users manually changed the time on their iPhones or moved between time zones, actions typically associated with the operation or use of the device. Apple recommended restarting the iPhones and enabling the automatic time setting within the "Date & Time" settings as a temporary solution while they worked on a fix [39585].
Boundary (Internal/External) within_system (a) within_system: - The software failure incident related to the iPhone battery percentage display issue on the iPhone 6S and 6S Plus is primarily within the system. The problem is linked to the iPhone's clock and is affecting users who have manually adjusted the time on their devices or traveled through different time zones [39699, 39585]. - Users changing the system time or moving between time zones are triggering the bug that causes the battery percentage icon to freeze and not accurately update, leading to incorrect battery level displays [39699, 39585]. (b) outside_system: - There is no explicit mention in the articles of contributing factors originating from outside the system that led to the software failure incident.
Nature (Human/Non-human) non-human_actions (a) The software failure incident occurring due to non-human actions: - The software failure incident related to the incorrect battery percentage display on iPhone 6S and 6S Plus was attributed to a bug in Apple's iOS software [39699, 39585]. - The bug caused the battery percentage icon to inaccurately update, leading some users to believe they had more battery power remaining than they actually did. - The problem was linked to the iPhone's clock and was particularly affecting users who had recently traveled through different time zones or manually adjusted the time on their devices. - Apple acknowledged the issue and was investigating the cause and a solution, advising affected users to reset their iPhones and ensure the "Set Automatically" option was turned on in the Date & Time settings. (b) The software failure incident occurring due to human actions: - The software failure incident was not directly attributed to human actions but rather to a bug in the iOS software related to time zone changes and manual time adjustments [39699, 39585]. - Users who manually changed the time on their iPhones or moved between time zones were more likely to experience the battery percentage display issue. - Apple recommended restarting the iPhones and enabling automatic time setting as a temporary solution until a fix was implemented in the iOS software update.
Dimension (Hardware/Software) hardware, software (a) The software failure incident related to hardware: - The issue with the iPhone 6S and 6S Plus displaying incorrect battery percentage was linked to a bug in Apple's iOS software [39699]. - Different versions of the iPhone 6S had varying battery life due to two chip variations inside the phone [39699]. - The problem with the battery percentage icon not updating accurately was closely linked to the iPhone's clock and affected users who had recently traveled through several time zones or manually adjusted the time on their device [39699]. - Apple advised affected users to reset their iPhones and ensure that the "Set Automatically" option in the Date & Time settings was turned on [39699]. (b) The software failure incident related to software: - The bug causing the iPhone 6S and 6S Plus to display a higher charge than the actual battery level was attributed to a software issue in Apple's iOS [39585]. - Apple acknowledged the bug and mentioned that it occurred when users manually changed the time on their iPhones or moved between time zones [39585]. - Apple was working on a fix for the bug and recommended users to restart their iPhones and enable the automatic time setting within the Date & Time settings as a temporary solution [39585]. - Apple was testing a new version of its iOS software, iOS 9.3, which was expected to address the bug along with adding new features [39585].
Objective (Malicious/Non-malicious) non-malicious (a) The software failure incident related to the iPhone battery percentage display issue is non-malicious. The problem was identified as a bug in the iOS software that caused the battery percentage icon to inaccurately update on the iPhone 6S and 6S Plus. Users experienced this issue when manually adjusting the time on their devices or traveling through different time zones. Apple acknowledged the bug and was investigating the cause to provide a solution [39699, 39585].
Intent (Poor/Accidental Decisions) poor_decisions, accidental_decisions (a) The software failure incident related to the iPhone battery percentage display issue seems to be more aligned with poor_decisions. The issue arose from users manually changing the time on their iPhones or moving between time zones, which caused the battery percentage icon to inaccurately update, leading to some iPhones shutting down while still displaying a full charge. Apple acknowledged the bug and recommended users to restart their iPhones and enable the automatic time setting to mitigate the problem. This issue highlights the impact of poor decisions such as manual time adjustments on the software functionality [39699, 39585]. (b) Additionally, the incident could also be attributed to accidental_decisions as users changing the time on their devices or traveling between time zones may not have intended to cause the battery percentage display issue. These actions, which are common practices like adjusting the clock for daylight savings or while traveling, inadvertently triggered the bug in the software. Apple is working on a fix for this issue, indicating that it was an unintended consequence of user actions rather than a deliberate choice [39699, 39585].
Capability (Incompetence/Accidental) accidental (a) The software failure incident related to development incompetence is not evident in the provided articles. (b) The software failure incident related to accidental factors is highlighted in both articles [39699, 39585]. The incident of the iPhone 6S and 6S Plus displaying incorrect battery percentages was attributed to a bug in the iOS software. This bug caused the battery meter to fail to update the percentage displayed accurately, leading to some iPhones shutting down while still showing a full charge. The issue was triggered when users manually changed the time on their iPhones or moved between time zones, actions that users might take when adjusting the clock for daylight savings or while traveling. Apple acknowledged the bug and was working on a fix, advising users to restart their iPhones and enable the automatic time setting within the "Date & Time" settings.
Duration temporary The software failure incident related to the iPhone battery percentage display issue can be categorized as a temporary failure. The issue with the battery percentage not updating accurately on the iPhone 6S and 6S Plus is linked to users manually changing the time on their devices or moving between time zones. This specific circumstance triggers the bug in the software, causing the battery meter to display incorrect information. Apple is working on a fix for this bug, and in the meantime, users are advised to restart their iPhones and enable the automatic time setting within the "Date & Time" settings [39699, 39585].
Behaviour omission, timing, other (a) crash: The software failure incident described in the articles does not involve a crash where the system loses state and does not perform any of its intended functions. Instead, the issue is related to the battery percentage icon not accurately updating on the iPhone 6S and 6S Plus, leading to users believing they have more battery power remaining than they do [39699, 39585]. (b) omission: The software failure incident can be categorized as an omission where the system omits to perform its intended functions at an instance(s). In this case, the bug causes the battery meter to fail to update the percentage displayed accurately, potentially leading to iPhones shutting down while still showing a full charge [39585]. (c) timing: The issue with the software failure incident is related to timing, where the system performs its intended functions correctly but at the wrong time. Specifically, the problem seems to be closely linked to the iPhone's clock and is affecting users who have recently traveled through several time zones or manually adjusted the time on their device [39699, 39585]. (d) value: The software failure incident does not involve a failure due to the system performing its intended functions incorrectly in terms of value. The issue with the battery percentage icon not updating accurately does not impact the total amount of battery power the phone can provide on one charge [39699]. (e) byzantine: The software failure incident is not characterized by a byzantine behavior where the system behaves erroneously with inconsistent responses and interactions. The issue is more straightforward, related to the battery percentage display not updating correctly under certain circumstances [39699, 39585]. (f) other: The behavior of the software failure incident can be categorized as a user-triggered anomaly. The problem arises when users manually change the time on their iPhones or move between time zones, affecting the accuracy of the battery percentage display. This user-triggered action leads to the system failing to update the battery meter correctly, causing potential confusion for users regarding their remaining battery power [39699, 39585].

IoT System Layer

Layer Option Rationale
Perception None None
Communication None None
Application None None

Other Details

Category Option Rationale
Consequence unknown The consequence of the software failure incident related to the iPhone battery percentage display issue was primarily inconvenience and potential confusion for users. There were no reported real observed consequences such as death, harm, basic needs impact, property loss, or delays due to this software bug. The issue mainly affected the accuracy of the battery percentage display on the iPhone 6S and 6S Plus, potentially leading users to believe they had more battery power remaining than they actually did. Apple acknowledged the bug and recommended temporary solutions until a fix could be implemented [39699, 39585].
Domain information, finance, other (a) The software failure incident reported in the articles is related to the information industry. The incident involves a bug in Apple's iOS software that affects the battery percentage display on iPhone 6S and 6S Plus devices, impacting the accurate information provided to users about their remaining battery power [39699, 39585]. (h) The incident also has implications for the finance industry as it involves a critical component of the iPhone, a widely used device for various financial transactions and activities. The inaccurate battery percentage display could potentially lead to unexpected shutdowns, affecting users' ability to access financial apps or make transactions [39699, 39585]. (m) Additionally, the software failure incident can be linked to the "other" category as it pertains to the technology industry. The bug in the iOS software, specifically related to the battery meter, highlights a technological flaw that impacts the functionality and user experience of Apple's smartphones, which are integral to the technology sector [39699, 39585].

Sources

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