Thanks. It looks most likely the freeze is a kernel bug in the 'nouveau' driver:
Jun 30 09:41:31 My-System kernel: [TTM] Buffer eviction failed Jun 30 09:44:35 My-System kernel: ------------[ cut here ]------------ Jun 30 09:44:35 My-System kernel: Trying to vfree() bad address (00000000ba0a4082) Jun 30 09:44:35 My-System kernel: WARNING: CPU: 0 PID: 1933 at mm/vmalloc.c:2237 __vunmap+0x1ec/0x210 Jun 30 09:44:35 My-System kernel: Modules linked in: vmw_vsock_vmci_transport vsock vmw_vmci binfmt_misc edac_mce_amd kvm_amd kvm snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio nls_iso8859_1 snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hda_core snd_hwdep snd_pcm crct10dif_pclmul ghash_clmulni_intel snd_seq_midi snd_seq_midi_event snd_rawmidi nouveau snd_seq snd_seq_device snd_timer eeepc_wmi aesni_intel asus_wmi mxm_wmi sparse_keymap ttm crypto_simd joydev input_leds cryptd glue_helper video wmi_bmof snd drm_kms_helper fb_sys_fops syscopyarea sysfillrect sysimgblt soundcore k10temp ccp mac_hid sch_fq_codel parport_pc ppdev lp parport drm dm_crypt ip_tables x_tables autofs4 hid_microsoft ff_memless hid_generic usbhid hid crc32_pclmul igb i2c_piix4 i2c_algo_bit ahci dca libahci wmi gpio_amdpt gpio_generic Jun 30 09:44:35 My-System kernel: CPU: 0 PID: 1933 Comm: gnome-shell Not tainted 5.4.0-39-generic #43-Ubuntu Jun 30 09:44:35 My-System kernel: Hardware name: System manufacturer System Product Name/ROG STRIX B350-F GAMING, BIOS 3401 12/04/2017 Jun 30 09:44:35 My-System kernel: RIP: 0010:__vunmap+0x1ec/0x210 Jun 30 09:44:35 My-System kernel: Code: 20 e8 28 cc fc ff eb d2 c3 31 d2 31 f6 48 c7 c7 ff ff ff ff e8 d5 fc ff ff eb bf 48 89 fe 48 c7 c7 d8 f6 37 9d e8 ef 97 e2 ff <0f> 0b eb b4 4c 89 ee 48 c7 c7 00 f7 37 9d e8 dc 97 e2 ff 0f 0b eb Jun 30 09:44:35 My-System kernel: RSP: 0018:ffffc41903d639b8 EFLAGS: 00010286 Jun 30 09:44:35 My-System kernel: RAX: 0000000000000000 RBX: ffffa0d8fb2b0f00 RCX: 0000000000000006 Jun 30 09:44:35 My-System kernel: RDX: 0000000000000007 RSI: 0000000000000082 RDI: ffffa0d93ec178c0 Jun 30 09:44:35 My-System kernel: RBP: ffffc41903d639e0 R08: 000000000000047a R09: 0000000000000004 Jun 30 09:44:35 My-System kernel: R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000f60 Jun 30 09:44:35 My-System kernel: R13: ffffa0d9055d4f60 R14: 00000126c1557d86 R15: ffffc41903d63b08 Jun 30 09:44:35 My-System kernel: FS: 00007f89abd83cc0(0000) GS:ffffa0d93ec00000(0000) knlGS:0000000000000000 Jun 30 09:44:35 My-System kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Jun 30 09:44:35 My-System kernel: CR2: 000055a5ddc1aff8 CR3: 00000007a9666000 CR4: 00000000003406f0 Jun 30 09:44:35 My-System kernel: Call Trace: Jun 30 09:44:35 My-System kernel: vunmap+0x30/0x40 Jun 30 09:44:35 My-System kernel: nvkm_umem_unmap+0x4e/0x70 [nouveau] Jun 30 09:44:35 My-System kernel: nvkm_object_dtor+0xa1/0x110 [nouveau] Jun 30 09:44:35 My-System kernel: nvkm_object_del+0x25/0x90 [nouveau] Jun 30 09:44:35 My-System kernel: nvkm_ioctl_del+0x3c/0x60 [nouveau] Jun 30 09:44:35 My-System kernel: nvkm_ioctl+0xf0/0x190 [nouveau] Jun 30 09:44:35 My-System kernel: nvkm_client_ioctl+0x12/0x20 [nouveau] Jun 30 09:44:35 My-System kernel: nvif_object_ioctl+0x4e/0x60 [nouveau] Jun 30 09:44:35 My-System kernel: nvif_object_fini+0x5a/0x80 [nouveau] Jun 30 09:44:35 My-System kernel: nvif_mem_fini+0xe/0x10 [nouveau] Jun 30 09:44:35 My-System kernel: nouveau_mem_fini+0x57/0x70 [nouveau] -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1885330 Title: [nouveau] System unresponsive to keyboard and mouse clicks when changing screen background Status in linux package in Ubuntu: Incomplete Bug description: Right click on screen background and choose settings. Then click a different background. System becomes unresponsive to keyboard input and mouse clicks. System returns to responsiveness after about 10 minutes. Description: Ubuntu 20.04 LTS Release: 20.04 CPU: 8-Core AMD Ryzen 7 1700 (-MT MCP-) speed: 2562 MHz Kernel: 5.4.0-37-generic x86_64 Up: 48m Mem: 2370.8/32114.5 MiB (7.4%) Storage: 1.82 TiB (5.5% used) Procs: 337 Shell: bash 5.0.16 inxi: 3.0.38 Expected behavior: Changing the background happens immediately and system remains responsive to input. What happened: System did not change the background immediately and became unresponsive to keyboard and mouse input for 10 minutes at which point the background changed to the selected one and responsiveness returned. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: gnome-control-center 1:3.36.2-0ubuntu1 ProcVersionSignature: Ubuntu 5.4.0-37.41-generic 5.4.41 Uname: Linux 5.4.0-37-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.3 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Fri Jun 26 15:50:44 2020 ExecutablePath: /usr/bin/gnome-control-center InstallationDate: Installed on 2020-06-13 (13 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423) ProcEnviron: PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: gnome-control-center UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1885330/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
