Hi Aaron, Please again verify this change. This limits the scope. Patch attached. Thanks, Srinivas On Thu, 2025-11-06 at 11:31 -0600, Aaron Rainbolt wrote: > On Thu, 06 Nov 2025 07:23:14 -0800 > srinivas pandruvada 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 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" wrote: > > > > >     > > > > > > On Tue, Apr 29, 2025 at 11:07 PM Srinivas Pandruvada > > > > > > 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            Buffer(16) > 5D A8 3B B2 B7 C8 42 35 > [   26.725991]   Arg1:   0000000002bd3ac4            Integer > 0000000000000001 > [   26.725996]   Arg2:   0000000033eb047e            Integer > 0000000000000002 > [   26.725999]   Arg3:   00000000de6cf5f1            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 > >