–Input and output devices: the new Linux supports new hardware (more multitouch devices) and adds improvements in some drivers. Now it supports, for example, Logitech Wireless Touchpad T650 and Microsoft Surface Pro 3 Type Cover.
–File systems: improvement of support for Btrfs RAID 5 and 6, bug solution for Ext4 that optimizes the use of the CPU, support for creating several read-only with OverlayFS; and F2FS, CephFS and SquashFS enhancements.
–Power management: new unified interface to access the properties of the devices offered by the firmware, support for P-States in the intel_pstate, improvements in the management of Intel Baytrail-T and Baytrail-T-CR; and support for DEP.
Have a look at the complete information Linux 3.19 in this article
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