Symantec Encryption products encrypt the drive and prevent the system from booting until a passphrase has been successfully entered.
There are some reports that keyboards may not work on certain hardware when attempting to enter the passphrase at Preboot.
There may be various causes for this, including some of the basic things you should check:
*Make sure you have disabled Quick/Fast boot in the BIOS as this will bypass the initialization of the USB ports and can keep the logic from loading during post.
*Some newer machines may need to XHCI mode enabled in the BIOS for USB ports.
*Some hardware may require a newer version of Symantec Encryption Desktop in order for these to work, and some versions may require different keyboard parameters to be configured.
*Some Keyboard layouts like French or Spanish may have issues whereas English does not have issues.
Solution Scenario 1: Disable Quick/Fast boot in the BIOS.
Solution Scenario 2: Toggle XHCI USB (USB 3.0) setting
Solution Scenario 3: HP 600 G1 systems have had some issues when Symantec Encryption Desktop 10.4.2 is installed. In order for this to be resolved, see article 161066 for more details. As specified in the article, a command to enable a legacy boot option for this issue can be done. If upgrading to SED 10.4.2 from a previous version, run the command before the upgrade, and during the upgrade, the parameters will remain intact.
This issue may be related to non-US keyboard layouts.
Solution Scenario 4: Keyboards on HP Z15/Z17 may not work at preboot with SED 10.4.2 clients when using non-US keyboard layouts. A fix was included in Symantec Encryption Desktop 10.4.2 MP3 and above.
Solution Scenario 5: Keyboards on some HP systems, such as HP Z4 G4, or RTL8822CE, may not work at preboot with SED 10.4.2 MP3 and above with non-US/English keyboard layout. This is an issue where the keyboard layout is not English. There may be other issues where the OS is English, but the locale settings are in non-US. The Symantec Encryption software can detect the keyboard layout and set automatically and when this happens the keyboard may not work at preboot. A possible solution for this is to configure the language in the BIOS configuration to match the locale being used. For example, if French locale settings are being used, set the language in the BIOS to French.
To locate this setting, go into the HP bios via F10, Advanced, select the Keyboard Layout to "French" and then reboot the system.
If the locale is set to Spanish, then in the BIOS, change the language to Spanish and this may resolve the issue.
Note: In some of these keyboards, external keyboards can work at preboot for non-US keyboards.