admin-guide/laptops/laptop-mode.rst

82 Laptop mode is controlled by the knob /proc/sys/vm/laptop_mode. This knob is
95 /proc/sys/vm to about 10 minutes (by default), which means that pages that are
105 gather information by setting the flag /proc/sys/vm/block_dump. When this flag
170 the /proc/sys/vm/dirty_ratio sysctl.
176 this nice and low. This corresponds to the /proc/sys/vm/dirty_background_ratio
429   if [ ! -e /proc/sys/vm/laptop_mode ] ; then
434   if [ ! -w /proc/sys/vm/laptop_mode ] ; then
555 		if [ -d /proc/sys/vm/pagebuf ] ; then
559 			echo $XFS_AGE > /proc/sys/vm/pagebuf/lm_flush_age
560 			echo $XFS_AGE > /proc/sys/fs/xfs/lm_sync_interval
561 		elif [ -f /proc/sys/fs/xfs/lm_age_buffer ] ; then
564 			echo $XFS_AGE > /proc/sys/fs/xfs/lm_age_buffer
565 			echo $XFS_AGE > /proc/sys/fs/xfs/lm_sync_interval
566 		elif [ -f /proc/sys/fs/xfs/age_buffer ] ; then
570 			echo $XFS_AGE > /proc/sys/fs/xfs/age_buffer
571 			echo $XFS_AGE > /proc/sys/fs/xfs/sync_interval
572 		elif [ -f /proc/sys/fs/xfs/age_buffer_centisecs ] ; then
576 			echo $AGE > /proc/sys/fs/xfs/age_buffer_centisecs
577 			echo $AGE > /proc/sys/fs/xfs/xfssyncd_centisecs
578 			echo 3000 > /proc/sys/fs/xfs/xfsbufd_centisecs
583 				echo 1					> /proc/sys/vm/laptop_mode
584 				echo "30 500 0 0 $AGE $AGE 60 20 0"	> /proc/sys/vm/bdflush
587 				echo 5					> /proc/sys/vm/laptop_mode
588 				echo "$AGE"				> /proc/sys/vm/dirty_writeback_centisecs
589 				echo "$AGE"				> /proc/sys/vm/dirty_expire_centisecs
590 				echo "$DIRTY_RATIO"			> /proc/sys/vm/dirty_ratio
591 				echo "$DIRTY_BACKGROUND_RATIO"		> /proc/sys/vm/dirty_background_ratio
632 		echo 0 > /proc/sys/vm/laptop_mode
633 		if [ -f /proc/sys/fs/xfs/age_buffer -a ! -f /proc/sys/fs/xfs/lm_age_buffer ] ; then
635 			echo $(($XFS_HZ*$DEF_XFS_AGE_BUFFER))	 	> /proc/sys/fs/xfs/age_buffer
636 			echo $(($XFS_HZ*$DEF_XFS_SYNC_INTERVAL)) 	> /proc/sys/fs/xfs/sync_interval
637 		elif [ -f /proc/sys/fs/xfs/age_buffer_centisecs ] ; then
639 			echo $((100*$DEF_XFS_AGE_BUFFER))	> /proc/sys/fs/xfs/age_buffer_centisecs
640 			echo $((100*$DEF_XFS_SYNC_INTERVAL))	> /proc/sys/fs/xfs/xfssyncd_centisecs
641 			echo $((100*$DEF_XFS_BUFD_INTERVAL))	> /proc/sys/fs/xfs/xfsbufd_centisecs
645 				echo "30 500 0 0 $U_AGE $B_AGE 60 20 0"	> /proc/sys/vm/bdflush
648 				echo "$U_AGE"				> /proc/sys/vm/dirty_writeback_centisecs
649 				echo "$B_AGE"				> /proc/sys/vm/dirty_expire_centisecs
650 				echo "$DEF_DIRTY_RATIO"			> /proc/sys/vm/dirty_ratio
651 				echo "$DEF_DIRTY_BACKGROUND_RATIO"	> /proc/sys/vm/dirty_background_ratio
721   status=`awk '/^state: / { print $2 }' /proc/acpi/ac_adapter/$2/state`
741   BATT_INFO=/proc/acpi/battery/$2/state
743   if [[ -f /proc/sys/vm/laptop_mode ]]
745      LM=`cat /proc/sys/vm/laptop_mode`
771 …to loss of data when the battery runs out. Check kernel ACPI support and /proc/acpi/battery folder…