前言
关机时候提示：
FAILED TO WRITE REG 28b4 WAIT REG 28c6
导致无法关机或者卡在关机中。。要强制关机。
环境
系统环境
Distributor ID: Ubuntu
Description: Ubuntu 18.04.4 LTS
Release: 18.04
Codename: bionic
Linux version : 5.3.0-53-generic (buildd@lgw01-amd64-016)
Gcc version: 7.5.0 (Ubuntu 7.5.0-3ubuntu1~18.04)
软件信息
version :
None
正文
解决方案：
进入grub，设置 amdgpu.noretry=0
后记
详细的错误信息：
$ dmsg
[ 0.000000] Linux version 5.3.0-53-generic (buildd@lgw01-amd64-016) (gcc version 7.5.0 (Ubuntu 7.5.0-3ubuntu1~18.04)) #47~18.04.1-Ubuntu SMP Thu May 7 13:10:50 UTC 2020 (Ubuntu 5.3.0-53.47~18.04.1-generic 5.3.18)
[ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-5.3.0-53-generic root=UUID=fd6fdfc1-4ec2-4069-8376-dbff8bfcc277 ro quiet splash vt.handoff=1
[ 0.000000] KERNEL supported cpus:
[ 0.000000] Intel GenuineIntel
[ 0.000000] AMD AuthenticAMD
[ 0.000000] Hygon HygonGenuine
[ 0.000000] Centaur CentaurHauls
[ 0.000000] zhaoxin Shanghai
[ 8.503190] failed to write reg 28b4 wait reg 28c6
[ 10.111201] failed to write reg 1a6f4 wait reg 1a706
[ 11.963177] failed to write reg 28b4 wait reg 28c6
[ 13.570821] failed to write reg 1a6f4 wait reg 1a706
[ 15.223197] failed to write reg 28b4 wait reg 28c6
[ 16.831153] failed to write reg 1a6f4 wait reg 1a706
[ 24.695214] failed to write reg 28b4 wait reg 28c6
[ 26.307244] failed to write reg 1a6f4 wait reg 1a706
[ 28.023171] failed to write reg 28b4 wait reg 28c6
[ 29.631173] failed to write reg 1a6f4 wait reg 1a706
[ 31.271218] failed to write reg 28b4 wait reg 28c6
[ 32.879210] failed to write reg 1a6f4 wait reg 1a706
[ 35.095637] failed to write reg 28b4 wait reg 28c6
[ 36.680117] failed to write reg 1a6f4 wait reg 1a706
[ 38.281082] failed to write reg 28b4 wait reg 28c6
[ 39.874224] failed to write reg 1a6f4 wait reg 1a706
[ 41.743882] failed to write reg 28b4 wait reg 28c6
[ 43.342273] failed to write reg 1a6f4 wait reg 1a706
[ 43.733242] Bluetooth: RFCOMM TTY layer initialized
[ 43.733248] Bluetooth: RFCOMM socket layer initialized
[ 43.733254] Bluetooth: RFCOMM ver 1.11
[ 46.137530] failed to write reg 28b4 wait reg 28c6
[ 47.740511] failed to write reg 1a6f4 wait reg 1a706
[ 48.307494] rfkill: input handler disabled
[ 150.994401] failed to write reg 28b4 wait reg 28c6
[ 152.614078] failed to write reg 1a6f4 wait reg 1a706
[ 154.242623] failed to write reg 28b4 wait reg 28c6
[ 155.858560] failed to write reg 1a6f4 wait reg 1a706
