The errors (or warnings) are generated by ASSERT like the following statement.
if (!i2c_success) /* Write failure */ ASSERT(i2c_success); Details @ https://elixir.bootlin.com/linux/v5.4.31/source/drivers/gpu/drm/amd/display/dc/core/dc_link.c#L1737 I am not an amdgpu expert but I don't think they are harmful but are indication that one feature in amdgpu does not work. If this really bugs you, I can backport a fix that silences the ASSERTs but outputs "simple log message" in uptream kernel. See following for details. commit a0e40018dcc3f59a10ca21d58f8ea8ceb1b035ac Author: Rodrigo Siqueira <rodrigo.sique...@amd.com> Date: Mon Feb 24 10:13:37 2020 -0500 drm/amd/display: Stop if retimer is not available Raven provides retimer feature support that requires i2c interaction in order to make it work well, all settings required for this configuration are loaded from the Atom bios which include the i2c address. If the retimer feature is not available, we should abort the attempt to set this feature, otherwise, it makes the following line return I2C_CHANNEL_OPERATION_NO_RESPONSE: ... // skipped -- 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/1871248 Title: amdgpu kernel errors in Linux 5.4 Status in linux package in Ubuntu: Confirmed Bug description: Linux atlas 5.4.0-21-generic #25-Ubuntu SMP Sat Mar 28 13:10:28 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux Ubuntu 20.04 beta fresh installation. Upgrades applied. AMD Ryzen 3 3200G with Radeon Vega Graphics Motherboard: Gigabyte B450 I AORUS PRO WIFI/B450 I AORUS PRO WIFI-CF, BIOS F50 11/27/2019 These errors keep appearing in the kernel messages. [ 3.258890] ------------[ cut here ]------------ [ 3.258944] WARNING: CPU: 1 PID: 621 at drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link.c:1737 write_i2c_retimer_setting+0xc8/0x3e0 [amdgpu] [ 3.258945] Modules linked in: amd64_edac_mod(-) cmac algif_hash algif_skcipher af_alg bnep edac_mce_amd ccp kvm snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio snd_hda_codec_hdmi snd_hda_intel snd_intel_nhlt snd_hda_codec snd_hda_core snd_hwdep snd_pcm crct10dif_pclmul ghash_clmulni_intel snd_seq_midi nls_iso8859_1 snd_seq_midi_event snd_rawmidi snd_seq aesni_intel iwlmvm crypto_simd mac80211 amdgpu cryptd libarc4 glue_helper snd_seq_device amd_iommu_v2 btusb iwlwifi gpu_sched btrtl wmi_bmof ttm btbcm k10temp snd_timer btintel input_leds drm_kms_helper bluetooth snd fb_sys_fops syscopyarea cfg80211 sysfillrect soundcore sysimgblt ecdh_generic ecc mac_hid sch_fq_codel parport_pc ppdev lp drm parport ip_tables x_tables autofs4 hid_generic usbhid hid nvme crc32_pclmul i2c_piix4 ahci igb nvme_core i2c_algo_bit dca libahci wmi video gpio_amdpt gpio_generic [ 3.258966] CPU: 1 PID: 621 Comm: gpu-manager Not tainted 5.4.0-21-generic #25-Ubuntu [ 3.258967] Hardware name: Gigabyte Technology Co., Ltd. B450 I AORUS PRO WIFI/B450 I AORUS PRO WIFI-CF, BIOS F50 11/27/2019 [ 3.259012] RIP: 0010:write_i2c_retimer_setting+0xc8/0x3e0 [amdgpu] ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-image-5.4.0-21-generic 5.4.0-21.25 ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27 Uname: Linux 5.4.0-21-generic x86_64 ApportVersion: 2.20.11-0ubuntu24 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: kirt 1293 F.... pulseaudio /dev/snd/controlC0: kirt 1293 F.... pulseaudio CurrentDesktop: ubuntu:GNOME Date: Mon Apr 6 15:52:30 2020 InstallationDate: Installed on 2020-04-06 (0 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402) MachineType: Gigabyte Technology Co., Ltd. B450 I AORUS PRO WIFI ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-21-generic root=UUID=9940ba5b-7683-413e-92a2-854b3816799b ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-5.4.0-21-generic N/A linux-backports-modules-5.4.0-21-generic N/A linux-firmware 1.187 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 11/27/2019 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: F50 dmi.board.asset.tag: Default string dmi.board.name: B450 I AORUS PRO WIFI-CF dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.asset.tag: Default string dmi.chassis.type: 3 dmi.chassis.vendor: Default string dmi.chassis.version: Default string dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF50:bd11/27/2019:svnGigabyteTechnologyCo.,Ltd.:pnB450IAORUSPROWIFI:pvrDefaultstring:rvnGigabyteTechnologyCo.,Ltd.:rnB450IAORUSPROWIFI-CF:rvrx.x:cvnDefaultstring:ct3:cvrDefaultstring: dmi.product.family: Default string dmi.product.name: B450 I AORUS PRO WIFI dmi.product.sku: Default string dmi.product.version: Default string dmi.sys.vendor: Gigabyte Technology Co., Ltd. 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