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In this case the <code>powersave</code> governor is used. Most importantly, Ethernet interface is disabled, as described in i.MX 6UltraLite Power Consumption Measurement application note.<ref name=[https://www.nxp.com/docs/en/application-note/AN5170.pdf "AN5170">NXP Semiconductors, ''i.MX 6UltraLite Power Consumption Measurement'', Rev. 1, 04/2016</ref> ] This allows to reduce power consumption significantly because

Two idle configurations have been tested, detailed in the following sections: generic idle and system idle. System idle is the same nomenclature used NXP official documentation (specifically processor's data sheet<ref name="[https://www.nxp.com/docs/en/data-sheet/IMX6ULIEC.pdf IMX6ULIEC">Freescale Semiconductor, ''i.MX 6UltraLite Applications Processors for Industrial Products Data Sheet'', Rev. 1, 04/2016<] and [https://www.nxp.com/docs/en/ref> and AN5170 application -note<ref name=/AN5170.pdf "AN5170">NXP Semiconductors, ''i.MX 6UltraLite Power Consumption Measurement'', Rev. 1, 04/2016</ref>]).

[1] '''24MHz active oscillator power consumption is included'''. As the board under test is equipped with iMX6UL revision 1.0, active oscillator is required to implement the fix described by errata ERR009455. Typical consumption of this oscillator is about 20mW. Future revision of the board will be populated with silicon revision 1.1 or newer. Thus active oscillator will be removed. For more details please refer to ''Chip Errata for the i[https://www.nxp.MX 6UltraLite''<ref name="com/docs/en/errata/IMX6ULCE">Freescale Semiconductor, .pdf ''Chip Errata for the i.MX 6UltraLite'', Rev. 0.1, 02/2016</ref>].

In this case the <code>powersave</code> governor is used. Most importantly, Ethernet interface is disabled, as described in ''i.MX 6UltraLite Power Consumption Measurement'' application note<ref name=[https://www.nxp.com/docs/en/application-note/AN5170.pdf "AN5170">NXP Semiconductors, ''i.MX 6UltraLite Power Consumption Measurement'', Rev. 1, 04/2016</ref>]. This allows to reduce power consumption significantly because

[1] '''24MHz active oscillator power consumption is included'''. As the board under test is equipped with iMX6UL revision 1.0, active oscillator is required to implement the fix described by errata ERR009455. Typical consumption of this oscillator is about 20mW. Future revision of the board will be populated with silicon revision 1.1 or newer. Thus active oscillator will be removed. For more details please refer to ''Chip Errata for the i[https://www.nxp.MX 6UltraLite''<ref name="com/docs/en/errata/IMX6ULCE">Freescale Semiconductor, .pdf ''Chip Errata for the i.MX 6UltraLite'', Rev. 0.1, 02/2016</ref>].

It is worth to remember that the use of <code>powersave</code> governor '''has a drawback in terms of system reactivity''', because processor is relatively slow to get out of the idle condition. This can lead to phenomena such as the UART RX FIFO overrun, as shown in the following box{{efn|This is the same issue described [[Linux_and_interrupt_latency_(Axel)#A_real-word_case:_UART_RX_FIFO_overrun|here]].}}. In this example, a relatively long command string has been pasted into the serial console terminal: 

[1] When entering DSM mode, iMX6UL turns 24MHz external active oscillator off. As the board under test is equipped with iMX6UL revision 1.0, active oscillator is required to implement the fix described by errata ERR009455. For more details please refer to ''Chip Errata for the i[https://www.nxp.MX 6UltraLite''<ref name="com/docs/en/errata/IMX6ULCE">Freescale Semiconductor, .pdf ''Chip Errata for the i.MX 6UltraLite'', Rev. 0.1, 02/2016</ref>].