My guess is that .../drivers/media/pci/cx23885/cx23885-core.c is important and maybe my IOMMU, but I don't feel competent to patch the code myself. Nor am I certain that "15d1" is the magic number for Raven Ridge APUs.
psd@myth:~$ lspci -s 0:00.2 00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Device 15d1 -- 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/1850728 Title: CPU mis identified, need to force workaround Status in linux package in Ubuntu: Confirmed Bug description: This is probably an upstream bug, but this looks like the first pont of contact. I have a TV tuner card that works with old CPUs but fails with new CPUs that are "too fast". This is a known problem and there is a workaround for it. The workaround is automatically applied when a "fast" CPU is detected, but not mine. The workaround can be forced by adding this file to /etc/modprobe.d # /etc/modprobe.d/Hauppauge-WinTV-QuadHD.conf # 0 means force workaround off # 1 means auto detect troublsome CPUs # 2 means force workaround on options cx23885 dma_reset_workaround=2 My CPU is only a Ryzen 3 2200G. I will attach the output of cpuid, minus the serial number. ProblemType: Bug DistroRelease: Ubuntu 19.10 Package: linux-image-5.3.0-19-generic 5.3.0-19.20 ProcVersionSignature: Ubuntu 5.3.0-19.20-generic 5.3.1 Uname: Linux 5.3.0-19-generic x86_64 ApportVersion: 2.20.11-0ubuntu8.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: psd 1263 F.... pulseaudio /dev/snd/controlC1: psd 1263 F.... pulseaudio CurrentDesktop: XFCE Date: Thu Oct 31 10:34:56 2019 InstallationDate: Installed on 2019-10-21 (9 days ago) InstallationMedia: Xubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017) IwConfig: lo no wireless extensions. enp12s0 no wireless extensions. MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M. ProcEnviron: LANGUAGE=en_AU:en PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_AU.UTF-8 SHELL=/bin/bash ProcFB: 0 nouveaudrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-19-generic root=UUID=a506aa84-ff7a-48c6-8121-fae57b937f9c ro quiet splash RelatedPackageVersions: linux-restricted-modules-5.3.0-19-generic N/A linux-backports-modules-5.3.0-19-generic N/A linux-firmware 1.183.1 RfKill: 0: hci0: Bluetooth Soft blocked: no Hard blocked: no SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 07/02/2019 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: P3.40 dmi.board.name: B450 Pro4 dmi.board.vendor: ASRock dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: To Be Filled By O.E.M. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP3.40:bd07/02/2019:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnB450Pro4:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.: dmi.product.family: To Be Filled By O.E.M. dmi.product.name: To Be Filled By O.E.M. dmi.product.sku: To Be Filled By O.E.M. dmi.product.version: To Be Filled By O.E.M. dmi.sys.vendor: To Be Filled By O.E.M. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1850728/+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
