This bug is awaiting verification that the linux-nvidia- tegra/6.8.0-1001.1 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-noble-linux-nvidia-tegra' to 'verification-done-noble-linux-nvidia-tegra'. If the problem still exists, change the tag 'verification-needed-noble-linux-nvidia-tegra' to 'verification-failed-noble-linux-nvidia-tegra'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: kernel-spammed-noble-linux-nvidia-tegra-v2 verification-needed-noble-linux-nvidia-tegra -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2049793 Title: [MTL] x86: Fix Cache info sysfs is not populated Status in intel: New Status in linux package in Ubuntu: Fix Released Status in linux source package in Noble: Fix Released Bug description: [SRU Justification] [Impact] The interface /sys/devices/system/cpu/cpuX/cache is broken (not populated) if CPUs have different numbers of subleaves in CPUID 4. This is the case of Intel Meteor Lake. [Fix] https://lore.kernel.org/all/[email protected]/ Reviewed, but probably will only land in v6.9. [Test Case] Check existence of cpu cache info: $ ls /sys/devices/system/cpu/cpu0/cache/ index0 index1 index2 index3 uevent [Where problems could occur] This populates sysfs entries that should have been available, not something new or alters existing interface. [Other Info] While this is targets v6.8 for Intel LPMD (Low Power Model Daemon)'s use, only Noble and Unstable will be nominated for fix. ========== original bug report ========== [Description] The interface /sys/devices/system/cpu/cpu*/cache is empty. In Meteorlake, not all CPUs have the same number of subleaves in the CPUID 4 leaf. The compute die CPUs have 3 subleaves whereas the CPUs in the SoC die have 2. This problem happens because Linux assumes that all CPUs have the same number of subleaves. [Hardware Information] Architecture: Intel / AMD (x86_64) Platform(s): Meteor Lake Date HW is expected at Canonical: Component(s): x86 [Software Information] Target Version: 24.04 Target Kernel: 6.8 Commit IDs: TBD External Links: https://lore.kernel.org/all/[email protected]/ [Business Justification] [Testing guidance] [External ID] LFE-6901 To manage notifications about this bug go to: https://bugs.launchpad.net/intel/+bug/2049793/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
