Public bug reported:
My Thinkpad X220 runs on intel_cpufreq even when explicitly requesting
intel_pstate=enable via grub. The mainline kernel uses the more recent
intel_pstate even when not explicitly requested so it's not a hardware
issue but a regression in Ubuntu's kernels.
$ cat /proc/cmdline
BOOT_IMAGE=/@ubuntu/boot/vmlinuz-6.8.0-107-generic root=UUID=XXX-b9ed8371b605
ro rootflags=subvol=@ubuntu quiet splash acpi_osi=linux preempt=full
i915.enable_psr=0 intel_pstate=enable vt.handoff=7
$ sudo cpupower -c all frequency-info|grep intel|uniq
driver: intel_cpufreq
mainline kernel 6.19.0-061900daily20260222-generic used for testing that
intel_pstate works fine on this machine.
$ cat /proc/version_signature
Ubuntu 6.8.0-107.107-generic 6.8.12
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: noble
** Description changed:
My Thinkpad X220 runs on intel_cpufreq even when explicitly requesting
intel_pstate=enable via grub. The mainline kernel uses the more recent
intel_pstate even when not explicitly requested so it's not a hardware
issue but a regression in Ubuntu's kernels.
- $ cat /proc/cmdline
+ $ cat /proc/cmdline
BOOT_IMAGE=/@ubuntu/boot/vmlinuz-6.8.0-107-generic root=UUID=XXX-b9ed8371b605
ro rootflags=subvol=@ubuntu quiet splash acpi_osi=linux preempt=full
i915.enable_psr=0 intel_pstate=enable vt.handoff=7
+
+ $ sudo cpupower -c all frequency-info|grep intel|uniq
+ driver: intel_cpufreq
mainline kernel 6.19.0-061900daily20260222-generic used for testing that
intel_pstate works fine on this machine.
- $ cat /proc/version_signature
+ $ cat /proc/version_signature
Ubuntu 6.8.0-107.107-generic 6.8.12
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https://bugs.launchpad.net/bugs/2148120
Title:
no intel_pstate support in Ubuntu Noble, regression from mainline
kernel
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