** Tags added: kernel-fixed-upstream -- 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/1901406
Title: Lenovo T490 extremely show with Ubuntu 20.20 running kernel 5.8 Status in linux package in Ubuntu: Confirmed Bug description: After upgrading from 20.04 to 20.20 on my laptop, the machine became extremely slow. After a days work I noticed that it never got any faster, and the machine was a lot colder than usual. Running cat /proc/cpuinfo and sudo cpupower frequency-info I noticed that the CPU was locked to 400Mhz. After some googling I found reports of people having trouble with CPU frequency governors on kernel 5.8. I tried to add intel_pstate=active to grub, but that didn't help. My short term workaround is to choose the old 5.4 kernel from 20.04. With this kernel everything is snappy again! Currently it's running at 3.2 Ghz with little load. CPU info from /proc/cpuinfo (with kernel 5.4): processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 142 model name : Intel(R) Core(TM) i7-8665U CPU @ 1.90GHz stepping : 12 microcode : 0xd6 cpu MHz : 4551.153 cache size : 8192 KB physical id : 0 siblings : 8 core id : 0 cpu cores : 4 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 22 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb invpcid_single ssbd ibrs ibpb stibp ibrs_enhanced tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid mpx rdseed adx smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp md_clear flush_l1d arch_capabilities bugs : spectre_v1 spectre_v2 spec_store_bypass swapgs taa itlb_multihit srbds bogomips : 4199.88 clflush size : 64 cache_alignment : 64 address sizes : 39 bits physical, 48 bits virtual power management: --- ProblemType: Bug ApportVersion: 2.20.11-0ubuntu50 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: hennikul 2402 F.... pulseaudio /dev/snd/pcmC0D0p: hennikul 2402 F...m pulseaudio CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME DistroRelease: Ubuntu 20.10 InstallationDate: Installed on 2019-09-02 (418 days ago) InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416) MachineType: LENOVO 20N2CTO1WW Package: linux (not installed) ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.8.0-25-generic root=UUID=a36f1344-fd6c-40ef-a397-57f5a57594df ro intel_pstate=active quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 5.8.0-25.26-generic 5.8.14 RelatedPackageVersions: linux-restricted-modules-5.8.0-25-generic N/A linux-backports-modules-5.8.0-25-generic N/A linux-firmware 1.190 Tags: groovy wayland-session Uname: Linux 5.8.0-25-generic x86_64 UpgradeStatus: Upgraded to groovy on 2020-10-23 (2 days ago) UserGroups: adm cdrom dip docker lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 01/19/2020 dmi.bios.release: 1.61 dmi.bios.vendor: LENOVO dmi.bios.version: N2IET83W (1.61 ) dmi.board.asset.tag: Not Available dmi.board.name: 20N2CTO1WW dmi.board.vendor: LENOVO dmi.board.version: SDK0J40697 WIN dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.ec.firmware.release: 1.16 dmi.modalias: dmi:bvnLENOVO:bvrN2IET83W(1.61):bd01/19/2020:br1.61:efr1.16:svnLENOVO:pn20N2CTO1WW:pvrThinkPadT490:rvnLENOVO:rn20N2CTO1WW:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone: dmi.product.family: ThinkPad T490 dmi.product.name: 20N2CTO1WW dmi.product.sku: LENOVO_MT_20N2_BU_Think_FM_ThinkPad T490 dmi.product.version: ThinkPad T490 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1901406/+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
