Short overview (for news sites, etc)
Linux 2.6.20 greatly improves kdump (http://news.zdnet.co.uk/software/0,1000000121,39285165,00.htm ); KVM (http://kvm.sourceforge.net) for Intel with VT and AMD with SVM hardware virtualization.
Important things (AKA: ''the cool stuff'')
- Asynchronous SCSI scanning
- Multithreaded USB probing
- New 300Hz option. Good because it evenly divides PAL and NTSC framerates
Drivers
- pata
- Add support for Winbond, Marvel, and others
- Some suspend/resume support added
- Add support for Moxa SmartIO multiport serial cards
- optimize o_direct on block devices
- HWMon: New Winbond W83793 hardware monitoring driver
Add NetXen 1G/10G ethernet driver.
- e1000: New hardware support
- Remove FTape driver
- Sensors
- Add support for Apple Motion Sensors
- Support for National Semiconductor PC87427 Super-I/O chip
- Support for Winbond W83793 sensors
- ohci1394: steps to implement suspend/resume
Video
- Add support for Philips UCB1400 touchscreen
- Framebuffer support for IBM GXT4500P adaptor
- Ability to set Geode framebuffer size
- DRM i915 updates
Network
- Atmel MACB support
Sound
- Remove obsolete OSS drivers that already have ALSA replacements
Other stuff
Arch-independent changes in the kernel core
Add support for Log2 mechanism [http://lwn.net/Articles/203596/]
Driver core: add notification of bus events [http://lkml.org/lkml/2006/12/1/297]
Architecture-specific changes
- ARM
- Support to change MX1 CPU frequency at runtime.
- Support for Atmel AT91SAM9260-EK (and 61) boards
- Some more suspend to RAM support
- i386
- Add support for a relocatable kernel. This is useful for kexec panics and another kernel being loaded.
- Add support to compile for Core2
- MIPS
- Use "long" for 64-bit values on 64-bit kernel.
- PowerPC
- Refactor 64 bit DMA operations
- Add support for EFIKA boards
- Add support for the Sony Playstation 3
- x86_64
- Add support to compile for Core2
Filesystems
- DebugFS: inotify support
Networking
CPU Freq
- Add support for CN400 when ACPI C3 isn't available.