自从我升级到 Cosmic Cuttlefish 后，我的三台电脑（Ryzen 1700 CPU、Radeon RX 550 显卡）中的一台出现了一些非常奇怪的症状。总体而言，它运行顺畅，但当我在 Xorg 上使用 Gnome 时，挂起后重新登录时极其很慢。计算机会快速恢复并显示 Gnome 锁屏。但是，锁屏没有响应，不允许我登录。然后显示器自动关闭。如果我很幸运，一两分钟后它们会重新打开，我终于可以登录了。但是，其他时候我必须强制重启电脑。检查系统日志时，我发现了一条与amdgpu（粘贴在底部）相关的错误消息。
我尝试了以下操作：
- 禁用锁屏（即无需密码即可登录）。同样的症状（除了，当屏幕在一两分钟后终于恢复时，我不必输入密码）。
- 在 Wayland 上切换到 Gnome。从恢复到登录的时间快了很多。但是，
amdgpu错误更频繁（因此需要重新启动）。
解决这个问题最简单的方法是什么？我很沮丧，因为我选择 AMD 而不是 Nvidia 是因为 AMD 支持开源。然而，这似乎与 AMD 的驱动程序有关。
Nov 07 19:50:48 phoenix kernel: [drm:generic_reg_wait [amdgpu]] *ERROR* REG_WAIT timeout 10us * 3000 tries - dce110_stream_encoder_dp_blank line:927 Nov 07 19:50:48 phoenix kernel: WARNING: CPU: 15 PID: 3598 at drivers/gpu/drm/amd/amdgpu/../display/dc/dc_helper.c:254 generic_reg_wait+0xe4/0x160 [amdgpu] Nov 07 19:50:48 phoenix kernel: Modules linked in: rfcomm pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) ccm xt_CHECKSUM iptable_mangle ipt_MASQUERADE iptable_nat nf_nat_ Nov 07 19:50:48 phoenix kernel: ccp mac_hid sch_fq_codel parport_pc ppdev lp parport sunrpc ip_tables x_tables autofs4 btrfs xor zstd_compress raid6_pq libcrc32c algif_skcipher af_alg d Nov 07 19:50:48 phoenix kernel: CPU: 15 PID: 3598 Comm: gnome-shell Tainted: G W OE 4.18.0-10-generic #11-Ubuntu Nov 07 19:50:48 phoenix kernel: Hardware name: System manufacturer System Product Name/PRIME B450-PLUS, BIOS 0409 08/24/2018 Nov 07 19:50:48 phoenix kernel: RIP: 0010:generic_reg_wait+0xe4/0x160 [amdgpu] Nov 07 19:50:48 phoenix kernel: Code: a9 44 8b 45 20 48 8b 4d 18 89 de 44 89 4d d4 8b 55 10 48 c7 c7 d0 b3 b2 c0 e8 28 c7 a8 ff 41 83 7c 24 20 01 44 8b 4d d4 74 02 <0f> 0b 48 83 c4 18 44 Nov 07 19:50:48 phoenix kernel: RSP: 0018:ffffbe084338f798 EFLAGS: 00010297 Nov 07 19:50:48 phoenix kernel: RAX: 0000000000000000 RBX: 000000000000000a RCX: 0000000000000000 Nov 07 19:50:48 phoenix kernel: RDX: 0000000000000000 RSI: ffffa0a21efd64b8 RDI: ffffa0a21efd64b8 Nov 07 19:50:48 phoenix kernel: RBP: ffffbe084338f7d8 R08: 000000000005e2a3 R09: 0000000000010200 Nov 07 19:50:48 phoenix kernel: R10: 0000000000000004 R11: ffffffffab78480d R12: ffffa0a1fe838000 Nov 07 19:50:48 phoenix kernel: R13: 0000000000000bb9 R14: 0000000000010000 R15: 0000000000000000 Nov 07 19:50:48 phoenix kernel: FS: 00007fd746c48400(0000) GS:ffffa0a21efc0000(0000) knlGS:0000000000000000 Nov 07 19:50:48 phoenix kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Nov 07 19:50:48 phoenix kernel: CR2: 0000286ba76df9e0 CR3: 00000003d05a6000 CR4: 00000000003406e0 Nov 07 19:50:48 phoenix kernel: Call Trace: Nov 07 19:50:48 phoenix kernel: dce110_stream_encoder_dp_blank+0x12f/0x1a0 [amdgpu] Nov 07 19:50:48 phoenix kernel: dce110_blank_stream+0x57/0x90 [amdgpu] Nov 07 19:50:48 phoenix kernel: core_link_disable_stream+0x57/0x220 [amdgpu] Nov 07 19:50:48 phoenix kernel: dce110_reset_hw_ctx_wrap+0xcd/0x1e0 [amdgpu] Nov 07 19:50:48 phoenix kernel: ? pp_dpm_dispatch_tasks+0x48/0x60 [amdgpu] Nov 07 19:50:48 phoenix kernel: dce110_apply_ctx_to_hw+0x52/0xa30 [amdgpu] Nov 07 19:50:48 phoenix kernel: ? amdgpu_pm_compute_clocks+0x17/0x20 [amdgpu] Nov 07 19:50:48 phoenix kernel: ? pplib_apply_display_requirements+0x1c3/0x1d0 [amdgpu] Nov 07 19:50:48 phoenix kernel: ? dce110_set_bandwidth+0x1d2/0x200 [amdgpu] Nov 07 19:50:48 phoenix kernel: dc_commit_state+0x306/0x5b0 [amdgpu] Nov 07 19:50:48 phoenix kernel: ? drm_calc_timestamping_constants+0x109/0x150 [drm] Nov 07 19:50:48 phoenix kernel: amdgpu_dm_atomic_commit_tail+0x37f/0xe40 [amdgpu] Nov 07 19:50:48 phoenix kernel: ? _cond_resched+0x19/0x30 Nov 07 19:50:48 phoenix kernel: ? wait_for_completion_timeout+0x38/0x140 Nov 07 19:50:48 phoenix kernel: ? _cond_resched+0x19/0x30 Nov 07 19:50:48 phoenix kernel: ? wait_for_completion_interruptible+0x35/0x1a0 Nov 07 19:50:48 phoenix kernel: commit_tail+0x42/0x70 [drm_kms_helper] Nov 07 19:50:48 phoenix kernel: drm_atomic_helper_commit+0x113/0x120 [drm_kms_helper] Nov 07 19:50:48 phoenix kernel: amdgpu_dm_atomic_commit+0x87/0xa0 [amdgpu] Nov 07 19:50:48 phoenix kernel: drm_atomic_commit+0x4a/0x50 [drm] Nov 07 19:50:48 phoenix kernel: drm_atomic_connector_commit_dpms+0xe0/0x100 [drm] Nov 07 19:50:48 phoenix kernel: drm_mode_obj_set_property_ioctl+0x187/0x2b0 [drm] Nov 07 19:50:48 phoenix kernel: ? drm_mode_obj_find_prop_id+0x40/0x40 [drm] Nov 07 19:50:48 phoenix kernel: drm_ioctl_kernel+0xa4/0xf0 [drm] Nov 07 19:50:48 phoenix kernel: drm_ioctl+0x227/0x400 [drm] Nov 07 19:50:48 phoenix kernel: ? drm_mode_obj_find_prop_id+0x40/0x40 [drm] Nov 07 19:50:48 phoenix kernel: amdgpu_drm_ioctl+0x4f/0x90 [amdgpu] Nov 07 19:50:48 phoenix kernel: do_vfs_ioctl+0xa8/0x620 Nov 07 19:50:48 phoenix kernel: ksys_ioctl+0x67/0x90 Nov 07 19:50:48 phoenix kernel: __x64_sys_ioctl+0x1a/0x20 Nov 07 19:50:48 phoenix kernel: do_syscall_64+0x5a/0x110 Nov 07 19:50:48 phoenix kernel: entry_SYSCALL_64_after_hwframe+0x44/0xa9 Nov 07 19:50:48 phoenix kernel: RIP: 0033:0x7fd7518d23c7 Nov 07 19:50:48 phoenix kernel: Code: 00 00 90 48 8b 05 c9 3a 0d 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 Nov 07 19:50:48 phoenix kernel: RSP: 002b:00007ffc4956e528 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 Nov 07 19:50:48 phoenix kernel: RAX: ffffffffffffffda RBX: 00005567d4e163e0 RCX: 00007fd7518d23c7 Nov 07 19:50:48 phoenix kernel: RDX: 00007ffc4956e560 RSI: 00000000c01864ba RDI: 000000000000000b Nov 07 19:50:48 phoenix kernel: RBP: 00007ffc4956e560 R08: 0000000000000003 R09: 00005567d4e23930 Nov 07 19:50:48 phoenix kernel: R10: 00005567d4e12778 R11: 0000000000000246 R12: 00000000c01864ba Nov 07 19:50:48 phoenix kernel: R13: 000000000000000b R14: 00007ffc4956e760 R15: 00007fd75268e8d0 Nov 07 19:50:48 phoenix kernel: ---[ end trace 0f20eacb3142b4af ]---