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| author | Jean Delvare <khali@linux-fr.org> | 2006-04-25 13:37:25 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-06-22 11:10:32 -0700 |
| commit | f9ba6c04ef1dcf16f7179b7883e9751baaac218e (patch) | |
| tree | 0d66c8aab1ea1c0343744925e53f7e9111daaff0 /Documentation/i2c | |
| parent | 7aadb8f943f6f8fb48962099cfba05ad0518b0ac (diff) | |
| download | linux-f9ba6c04ef1dcf16f7179b7883e9751baaac218e.tar.gz linux-f9ba6c04ef1dcf16f7179b7883e9751baaac218e.tar.bz2 linux-f9ba6c04ef1dcf16f7179b7883e9751baaac218e.zip | |
[PATCH] I2C: i2c-piix4: Document the IBM problem more clearly
Properly document on which systems the i2c-piix4 SMBus driver will
refuse to load. Hopefully this will make it clearer for users, which
were often wondering why their destop or server systems were detected
as laptops.
Closes bug #6429.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'Documentation/i2c')
| -rw-r--r-- | Documentation/i2c/busses/i2c-piix4 | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/i2c/busses/i2c-piix4 b/Documentation/i2c/busses/i2c-piix4 index a706ae6a1b41..921476333235 100644 --- a/Documentation/i2c/busses/i2c-piix4 +++ b/Documentation/i2c/busses/i2c-piix4 @@ -82,3 +82,17 @@ the SMI mode. Please note that you don't need to do that in all cases, just when the SMBus is not working properly. + + +Hardware-specific issues +------------------------ + +This driver will refuse to load on IBM systems with an Intel PIIX4 SMBus. +Some of these machines have an RFID EEPROM (24RF08) connected to the SMBus, +which can easily get corrupted due to a state machine bug. These are mostly +Thinkpad laptops, but desktop systems may also be affected. We have no list +of all affected systems, so the only safe solution was to prevent access to +the SMBus on all IBM systems (detected using DMI data.) + +For additional information, read: +http://www2.lm-sensors.nu/~lm78/cvs/lm_sensors2/README.thinkpad |