This is a list of the most important changes between 2.x versions. It is by
no means complete, listing only user-visible changes which are interesting.
The ultimate way to know what has changed is to run diff, or even neater,
ask CVS about it:

  * Checkout the archive (see doc/cvs for how you can do this)
  * Determine which tags are valid, by running this command from the
    project root directory:
      cvs status -v -l Makefile
    Valid tags are usually like form V2-1-0 for version 2.1.0
  * Ask cvs for the difference between two versions:
      cvs diff -r TAG1 -r TAG2 DIFF-OPTIONS
    for example:
      cvs diff -r V2-0-0 -r V2-0-1 -u

2.5.0 (200003??)
  Dropped all kernel 2.0 and 2.1 compatibility
  Module i2c-i810: new
  Module i2c-amd756: fixed region request
  Module ddcmon: new
  Module via686a: new
  Module i2c-voodoo3: Converted to use i2c-algo-bit layer
  Module w83781d: Doesn't change pin settings at initialization
  Library: Support for ddcmon and via686a
  Program sensors-detect: Support for ddcmon and via686a
  Program sensors: Support for eeprom, ddcmon and via686a

2.4.5 (20000116)
  Introduced DESTDIR installation prefix
  Module lm80: fixes, temperature now read and set correctly
  Module i2c-voodoo3: driver enhancements
  Module w83781d: fixes, AS99127 works much better now
  Library: New ignore keyword in config file
  Programs: Support for new ignore keyword
  Program sensors-detect: Support for MGA detections

2.4.4 (19991201)
  Addition of the alpha release of AMD 756 SMBus host support.
  Many fixes and updates to the gl518sm driver
  Updates and fixes for device detection

2.4.0 (19990920)
  Too much to list. 
  i2c and smbus parts are split off to a separate i2c package.
  New drivers and other stuff.

2.3.4 (19990616)
  Module matorb: driver for Matrix-Orbital Displays (small LCD and VFDs)
  All: Now compiles against kernel 2.0.x (again ;)
  Module gl518sm: some updates and refinements

2.3.3 (19990603)
  All: Now compiles against kernel 2.3.x (x >= 1)
  Module i2c-voodoo3: Timing issue fixes
  Module bt869: Seems to be functional and relatively well tested
  Many modules were modified to be more compatible with the new
   Mutex structure in the new experimental kernels.

2.3.2 (19990507)
  Module i2c-hydra: Now compiles on 2.0.x kernels
  Module i2c-lm75: Slightly better detection
  * New, but not compiled by default:
  Module i2c-voodoo3: beginning of Voodoo3 I2C bus driver
  Module bt869: Beginning of BT869 (PAL/NTSC video converter) driver

2.3.1 (19990501)
  All: Now compiles on PPC
  Module i2c-hydra: NEW
  Module i2c-proc: Buffer overflow removed: `less /proc/bus-i2c-0' now works
  Module w83781d: Removed deadlock (mutex was not initialized)
  Documentation: A few glitches removed
  Makefile: default module installation directory is now 
            /lib/modules/current/extra/misc
  Program sensors-detect: PPC Hydra now detected
  Program sensors: Now prints complete GL518SM information
  Program sensors: SIS5595, ADM1021, MAX1617(A), ADM9240, DS1780 added

2.3.0 (19990422)
  All: Many, many changes and improvements
  All: Many small bugs and problems removed
  Modules: New insmod parameters
  Modules: Much improved chip detection
  Module maxilife: NEW
  Module adm1021: MAX1617A now also supported
  Module adm9024: DS1780 now also supported
  Module w83781d: W83782D and W83783S now also supported
  Program sensors-detect: NEW
  Library: All chips now supported
  Documentation: Very much improved

2.2.2 (199903??)
  Just some minor updates and bug fixes.

2.2.1 (19990218)
  All: Removed compile warnings
  Module i2c-dev: Small bug removed if DEBUG=1 was used
  Module sis5595: Now compiles for 2.0 kernels
  Module adm1021: Detection corrected
  
2.2.0 (19990216)
  All: Set copyrights to include 1999
  All: Small bugfixes
  I2C: Upgraded to newest archive of Simon Vogl
  Module i2c-dev: NEW
  Module i2c-ali15x3: NEW
  Module i2c-via: This is old module bit-mb, now moved to the main lm_sensors
     directories, and somewhat improved
  Module sis5595: NEW
  Modules: Renamed all bus modules to i2c-*, new directory lay-out
  Library: Support for new chip drivers, several small bugs fixed
  Library manual pages: NEW
  Program i2cdetect: Moved to detect directory
  Program detect.pl: NEW
  Program doc-features: NEW
  Program sensors: Added man-page
  Document BUGS: Added cdrom bug and kernel i2c conflict
  
2.1.2 (19990116)
  Modules lm80.o, w83781d.o: fan-related Segmentation fault corrected
  Module gl518sm.o: yet more bug fixes. It should at long last be usable now
  Documentation in doc/kernel: NEW

2.1.1 (19990107)
  Module i2c-proc.o: Hack to make /proc/bus/ possible for kernels 2.0.35
                     and older
  Module gl518sm.o: Miscelaneous bugs and problems solved
  Program isadump: NEW

2.1.0 (19981230)
  Library: Completely NEW
  Program sensors: NEW
  Program grab_busses: NEW
  Program decode-dimms: More information
  Module bit-mb.o: Removed spurious semicolon; now runs on more VIA chipsets
  Module w83781d.o: NEW
  Module lm80.o: NEW
  Module gl518sm.o: new procfile beep, several small updates
  Modules: Now use pin readings, no more scaling within the kernel (use the
           library instead)
  
2.0.2 (19981214)
  Module eeprom.o: NEW
  Program decode-dimms: NEW
  Modules: fill_inode fix, will stop segfaults on unloading in kernels after
           2.1.58
  Modules: Somewhat less verbose on transfers
  Module lm78.o now recognizes and handles lm78-j and lm79
2.0.1 (1998121?)
  Module gl518sm.o updates, to make it actually work
  Module lm75.o high/low-byte swapping write bug fixed
2.0.0 (19981209)
  Initial release