The dmidecode command dumps the system’s Desktop Management Interface (DMI) table and presents it in a human-readable format. The DMI table is an industry-standard for tracking information about hardware components. It separates components into types, with each type given a number—for example, type 4 is a processor, type 39 is a power supply, etc. Like similar commands, you can use dmidecode to verify connected devices and whether or not they support certain features. However, the authors of dmidecode caution that the information in DMI tables is, more often than not, “inaccurate, incomplete, or simply wrong.” Therefore, don’t rely on DMI tables as the sole source of hardware information.
Syntax
The syntax of the dmidecode command is:
# dmidecode [options]
dmidecode Command Examples
1. To read memory from file:
# dmidecode -d /dev/mem
2. To be less verbose:
# dmidecode -q # dmidecode --quite
3. To print the value of the DMI string:
# dmidecode -s bios-version # dmidecode --string bios-version
available strings:
bios-vendor, bios-version, bios-release-date, system-manufacturer, system-product-name, system-version, system-serial-number, system-uuid, baseboard-manufacturer board-product-name, baseboard-version, baseboard-serial-number, baseboard-asset-tag, chassis- facturer, chassis-type, chassis-version, chassis-serial-number, chassis-asset-tag, processor-family, processor-manufacturer, processor-version, processor-frequency.
4. To display entries of specified type:
# dmidecode -t TYPE # dmidecode -t memory # dmidecode --type memory
Available types:
bios, system, baseboard, chassis, processor, memory, cache, connector, slot.
5. To not decode entries, dump as hexadecimal:
# dmidecode -u # dmidecode --dump
6. To dump the DMI data into file:
# dmidecode --dump-bin /tmp/file.txt
7. To display the usage information:
# dmidecode -h
8. To display the version and exit:
# dmidecode -V # dmidecode --version
9. To list the BIOS:
# dmidecode -t 0
10. To list the System:
# dmidecode -t 1
--------------------------------------------------------
SMBIOS 2.4 present.
Handle 0x0001, DMI type 1, 27 bytes
System Information
Manufacturer: VMware
Product Name: VMware Platform
Version: None
Serial Number: VMware-XX XX XX XX XX XX XX
UUID: 12252f1252645623sfdt342317q
Wake-up Type: Power Switch
SKU Number: Not Specified
Family: Not Specified 11. To list the Base Board:
# dmidecode -t 2
# dmidecode 2.10
SMBIOS 2.4 present.
Handle 0x0002, DMI type 2, 15 bytes
Base Board Information
Manufacturer: Intel Corp
Product Name: 440BX Desktop Reference Platform
Version: None
Serial Number: None
Asset Tag: Not Specified
Features: None
Location In Chassis: Not Specified
Chassis Handle: 0x0000
Type: Unknown
Contained Object Handles: 0 12. To list the Chassis:
# dmidecode -t 3
SMBIOS 2.4 present.
Handle 0x0003, DMI type 3, 21 bytes
Chassis Information
Manufacturer: No Enclosure
Type: Other
Lock: Not Present
Version: N/A
Serial Number: None
O/P Truncated 13. To list the Processor:
# dmidecode -t 4
Processor Information
Socket Designation: CPU socket #63
Type: Central Processor
Family: Unknown
Manufacturer: 000000000000
ID: 00 00 00 00 00 00 00 00
Version: 00000000000000000000000000000000
Voltage: 3.3 V 14. To list the Memory Controller:
# dmidecode -t 5
# dmidecode 2.10
SMBIOS 2.4 present.
Handle 0x0044, DMI type 5, 46 bytes
Memory Controller Information
Error Detecting Method: None
Error Correcting Capabilities:
None
Supported Interleave: One-way Interleave
Current Interleave: One-way Interleave
Maximum Memory Module Size: 32768 MB
Maximum Total Memory Size: 491520 MB
Supported Speeds:
70 ns
60 ns
Supported Memory Types:
FPM
EDO
DIMM
SDRAM 15. To list the Memory Module:
# dmidecode -t 6
16. To list the Cache:
# dmidecode -t 7
17. To list the Port Connector:
# dmidecode -t 8
18. To list the System Slots:
# dmidecode -t 9
19. To list the On Board Devices:
# dmidecode -t 10
20. To list the OEM Strings:
# dmidecode -t 11
21. To list the System Configuration Options:
# dmidecode -t 12
22. To list the BIOS Language:
# dmidecode -t 13
23. To list the Group Associations:
# dmidecode -t 14
24. To list the System Event Log:
# dmidecode -t 15
25. To list the Physical Memory Array:
# dmidecode -t 16
26. To list the Memory Device:
# dmidecode -t 17
27. To list the 32-bit Memory Error:
# dmidecode -t 18
28. To list the Memory Array Mapped Address:
# dmidecode -t 19
29. To list the Memory Device Mapped Address:
# dmidecode -t 20
30. To list the Built-in Pointing Device:
# dmidecode -t 21
31. To list the Portable Battery:
# dmidecode -t 22
32. To list the System Reset:
# dmidecode -t 23
33. To list the Hardware Security:
# dmidecode -t 24
34. To list the System Power Controls:
# dmidecode -t 25
35. To list the Voltage Probe:
# dmidecode -t 26
36. To list the Cooling Device:
# dmidecode -t 27
37. To list the Temperature Probe:
# dmidecode -t 28
38. To list the Electrical Current Probe:
# dmidecode -t 29
39. To list the Out-of-band Remote Access:
# dmidecode -t 30
40. To list the Boot Integrity Services:
# dmidecode -t 31
41. To list the System Boot:
# dmidecode -t 32
42. To list the 64-bit Memory Error:
# dmidecode -t 33
43. To list the Management Device:
# dmidecode -t 34
44. To list the Management Device Component:
# dmidecode -t 35
45. To list the Management Device Threshold Data:
# dmidecode -t 36
46. To list the Memory Channel:
# dmidecode -t 37
47. To list the IPMI Device:
# dmidecode -t 38
48. To list the Power Supply:
# dmidecode -t 39
49. To list the Additional Information:
# dmidecode -t 40
50. To list the on-board Device:
# dmidecode -t 41