Public bug reported:
[Impact]
significant delays at bootup, the bootup time is 7 sec when this feature is
disabled,
but 20 sec when it's enabled.
[Fix]
v6.10-rc1 introduce encryption overhead to all kernel to TPM transactions,
Disable it by default until there is a real fix.
[Test]
Vendor tested on hardware, bootup is 7 sec as 6.8 noble kernel.
[Where problems could occur]
It may less security or break TPM.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux-oem-6.11 (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux (Ubuntu Noble)
Importance: Undecided
Status: Invalid
** Affects: linux-oem-6.11 (Ubuntu Noble)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Oracular)
Importance: Undecided
Status: New
** Affects: linux-oem-6.11 (Ubuntu Oracular)
Importance: Undecided
Status: Invalid
** Summary changed:
- [SRU] Disable CONFIG_TCG_TPM2_HMAC to avoid performance loss
+ [SRU] Disable CONFIG_TCG_TPM2_HMAC to avoid performance loss after v6.10
** Also affects: linux-oem-6.11 (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Noble)
Importance: Undecided
Status: New
** Also affects: linux-oem-6.11 (Ubuntu Noble)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Oracular)
Importance: Undecided
Status: New
** Also affects: linux-oem-6.11 (Ubuntu Oracular)
Importance: Undecided
Status: New
** Changed in: linux-oem-6.11 (Ubuntu Oracular)
Status: New => Invalid
** Changed in: linux (Ubuntu Noble)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2080322
Title:
[SRU] Disable CONFIG_TCG_TPM2_HMAC to avoid performance loss after
v6.10
Status in linux package in Ubuntu:
New
Status in linux-oem-6.11 package in Ubuntu:
Invalid
Status in linux source package in Noble:
Invalid
Status in linux-oem-6.11 source package in Noble:
New
Status in linux source package in Oracular:
New
Status in linux-oem-6.11 source package in Oracular:
Invalid
Bug description:
[Impact]
significant delays at bootup, the bootup time is 7 sec when this feature is
disabled,
but 20 sec when it's enabled.
[Fix]
v6.10-rc1 introduce encryption overhead to all kernel to TPM transactions,
Disable it by default until there is a real fix.
[Test]
Vendor tested on hardware, bootup is 7 sec as 6.8 noble kernel.
[Where problems could occur]
It may less security or break TPM.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2080322/+subscriptions
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