I can reproduce on 4.15.0-107.73, the current -updates kernel: ubuntu@dragon410c:~$ ls /sys/devices/system/cpu/cpufreq/ ubuntu@dragon410c:~$ So this is not a regression with current -proposed.
With 4.15.0-45.48 (the one from the ppisati image): ubuntu@dragon410c:~$ ls /sys/devices/system/cpu/cpufreq/ ondemand policy0 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-snapdragon in Ubuntu. https://bugs.launchpad.net/bugs/1860527 Title: sysfs files under /sys/devices/system/cpu/cpufreq/ disappear after upgrading kernel Status in linux-snapdragon package in Ubuntu: New Status in linux-snapdragon source package in Bionic: New Bug description: sysfs files under /sys/devices/system/cpu/cpufreq/ disappear after upgrading kernel. Kernel: Linux dragon410c 4.15.0-1071-snapdragon #78-Ubuntu SMP Thu Jan 16 22:30:28 UTC 2020 aarch64 aarch64 aarch64 GNU/Linux Steps: 1. Flash following image and boot the DUT https://people.canonical.com/~ppisati/ubuntu_embedded/ubuntu-embedded-18.04-dragon410c.img.xz 2. Enable proposed repository 3. Upgrade kernel to 4.15.0-1071 4. Reboot 5. Check file in /sys/devices/system/cpu/cpufreq/ Expected result: Files are still there after upgrading kernel. Actual result: Files under /sys/devices/system/cpu/cpufreq/ disappear after upgrading kernel. Hardware infomation: Dragonboard 410c ip address: 10.101.51.17 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-snapdragon/+bug/1860527/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
