Re: [REGRESSION] Intel Turbo Boost stuck disabled on some Clevo machines (was: [PATCH] cpufreq: intel_pstate: Unchecked MSR aceess in legacy mode)

[Aaron Rainbolt <arainbolt@kfocus.org>]

On Thu, 06 Nov 2025 07:23:14 -0800
srinivas pandruvada <srinivas.pandruvada@linux.intel.com> wrote:

> Hi Aaron,
> 
> On Wed, 2025-09-10 at 15:33 -0500, Aaron Rainbolt wrote:
> > On Wed, 10 Sep 2025 10:15:00 -0700
> > srinivas pandruvada <srinivas.pandruvada@linux.intel.com> wrote:
> >   
> > > On Wed, 2025-09-10 at 11:36 -0500, Aaron Rainbolt wrote:  
> > > > On Wed, 30 Apr 2025 16:29:09 +0200
> > > > "Rafael J. Wysocki" <rafael@kernel.org> wrote:
> > > >     
> > > > > On Tue, Apr 29, 2025 at 11:07 PM Srinivas Pandruvada
> > > > > <srinivas.pandruvada@linux.intel.com> wrote:    
> > > > > > 
> > > > > > When turbo mode is unavailable on a Skylake-X system,
> > > > > > executing
> > > > > > the
> > > > > > command:
> > > > > > "echo 1 > /sys/devices/system/cpu/intel_pstate/no_turbo"
> > > > > > results in an unchecked MSR access error: WRMSR to 0x199
> > > > > > (attempted to write 0x0000000100001300).  
> Please try the attached patch, if this address this issue.

I can confirm that this patch does resolve the issue when applied to
Kubuntu Focus's 6.14 kernel. CPU frequencies are available that require
turbo boost, and `cat /sys/devices/system/cpu/intel_pstate` returns
`0`. The logs from `dmesg` also indicate that turbo was disabled
earlier in boot, but the warnings about turbo being disabled stop
appearing later on, even when manipulating the `no_turbo` file:

[   25.893012] intel_pstate: Turbo is disabled
[   25.893019] intel_pstate: Turbo disabled by BIOS or unavailable on processor
[   25.950587] NET: Registered PF_QIPCRTR protocol family
[   26.599013] Realtek Internal NBASE-T PHY r8169-0-6c00:00: attached PHY driver (mii_bus:phy_addr=r8169-0-6c00:00, irq=MAC)
[   26.725959] ACPI BIOS Error (bug): Could not resolve symbol [\_TZ.ETMD], AE_NOT_FOUND (20240827/psargs-332)

[   26.725976] No Local Variables are initialized for Method [_OSC]

[   26.725978] Initialized Arguments for Method [_OSC]:  (4 arguments defined for method invocation)
[   26.725979]   Arg0:   0000000030ddf166 <Obj>           Buffer(16) 5D A8 3B B2 B7 C8 42 35
[   26.725991]   Arg1:   0000000002bd3ac4 <Obj>           Integer 0000000000000001
[   26.725996]   Arg2:   0000000033eb047e <Obj>           Integer 0000000000000002
[   26.725999]   Arg3:   00000000de6cf5f1 <Obj>           Buffer(8) 00 00 00 00 05 00 00 00

[   26.726010] ACPI Error: Aborting method \_SB.IETM._OSC due to previous error (AE_NOT_FOUND) (20240827/psparse-529)
[   26.726056] Consider using thermal netlink events interface
[   26.769209] r8169 0000:6c:00.0 enp108s0: Link is Down
[   26.857318] zram0: detected capacity change from 0 to 195035136
[   26.864390] vboxdrv: Found 32 processor cores/threads
[   26.873227] Adding 97517564k swap on /dev/zram0.  Priority:-2 extents:1 across:97517564k SS
[   26.880588] vboxdrv: TSC mode is Invariant, tentative frequency 2419194640 Hz
[   26.880592] vboxdrv: Successfully loaded version 7.2.4 r170995 (interface 0x00340001)
[   26.895725] intel_pstate: Turbo is disabled
[   26.895730] intel_pstate: Turbo disabled by BIOS or unavailable on processor
[   26.943715] iwlwifi 0000:00:14.3: WFPM_UMAC_PD_NOTIFICATION: 0x20
[   26.943746] iwlwifi 0000:00:14.3: WFPM_LMAC2_PD_NOTIFICATION: 0x1f
[   26.943755] iwlwifi 0000:00:14.3: WFPM_AUTH_KEY_0: 0x90
[   26.943765] iwlwifi 0000:00:14.3: CNVI_SCU_SEQ_DATA_DW9: 0x0
[   26.944901] iwlwifi 0000:00:14.3: RFIm is deactivated, reason = 5
[   27.045437] iwlwifi 0000:00:14.3: Registered PHC clock: iwlwifi-PTP, with index: 0
[   27.098590] VBoxNetFlt: Successfully started.
[   27.101687] VBoxNetAdp: Successfully started.
[   27.153602] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[   27.851014] loop14: detected capacity change from 0 to 8
[   27.895706] r8169 0000:6c:00.0: invalid VPD tag 0xff (size 0) at offset 0; assume missing optional EEPROM
[   28.898015] intel_pstate: Turbo is disabled
[   28.898021] intel_pstate: Turbo disabled by BIOS or unavailable on processor
[   31.900781] intel_pstate: Turbo is disabled
[   31.900788] intel_pstate: Turbo disabled by BIOS or unavailable on processor
[   33.959448] Bluetooth: RFCOMM TTY layer initialized
[   33.959456] Bluetooth: RFCOMM socket layer initialized
[   33.959462] Bluetooth: RFCOMM ver 1.11
[   36.903768] intel_pstate: Turbo is disabled
[   36.903777] intel_pstate: Turbo disabled by BIOS or unavailable on processor
[   38.054345] systemd-journald[883]: /var/log/journal/a9e8e3d2041547169b107e1e1a23f2ce/user-1000.journal: Journal file uses a different sequence number ID, rotating.
[   39.799560] warning: `kded5' uses wireless extensions which will stop working for Wi-Fi 7 hardware; use nl80211
[   40.884365] wlp0s20f3: authenticate with 18:ee:86:8b:16:a2 (local address=98:bd:80:8a:e9:27)
[   40.885147] wlp0s20f3: send auth to 18:ee:86:8b:16:a2 (try 1/3)
[   40.968595] wlp0s20f3: authenticate with 18:ee:86:8b:16:a2 (local address=98:bd:80:8a:e9:27)
[   40.968603] wlp0s20f3: send auth to 18:ee:86:8b:16:a2 (try 1/3)
[   40.980941] wlp0s20f3: authenticated
[   40.981904] wlp0s20f3: associate with 18:ee:86:8b:16:a2 (try 1/3)
[   41.042933] wlp0s20f3: RX AssocResp from 18:ee:86:8b:16:a2 (capab=0x1431 status=0 aid=14)
[   41.046917] wlp0s20f3: associated

If you post the patch, I'm happy to add a `Tested-by` tag for it.
Thank you for your help!

> Thanks,
> Srinivas