Hi, I observe my computer sometimes cannot enter the sleep mode.
`linux` : `6.8.0-40-generic #40~22.04.3-Ubuntu SMP PREEMPT_DYNAMIC Tue Jul 30 17:30:19 UTC 2 x86_64 x86_64 x86_64 GNU/Linux`
`amdgpu` : `6.8.5`
```
[ 6851.472194] amdgpu_ttm_tt_populate+0xb4/0xf0 [amdgpu]
[ 6851.472551] amdgpu_ttm_evict_resources+0x36/0x70 [amdgpu]
[ 6851.472779] amdgpu_device_prepare+0x59/0x180 [amdgpu]
[ 6851.473002] amdgpu_pmops_prepare+0x43/0x80 [amdgpu]
[ 6851.473414] amdgpu 0000:01:00.0: PM: device_prepare(): pci_pm_prepare+0x0/0x80 returns -12
[ 6851.473419] amdgpu 0000:01:00.0: PM: not prepared for power transition: code -12
[ 6852.488444] amdgpu 0000:01:00.0: PM: device_prepare(): pci_pm_prepare+0x0/0x80 returns -12
[ 6852.488451] amdgpu 0000:01:00.0: PM: not prepared for power transition: code -12
[ 7753.329356] amdgpu_ttm_tt_populate+0xb4/0xf0 [amdgpu]
[ 7753.329766] amdgpu_ttm_evict_resources+0x36/0x70 [amdgpu]
[ 7753.329994] amdgpu_device_prepare+0x59/0x180 [amdgpu]
[ 7753.330217] amdgpu_pmops_prepare+0x43/0x80 [amdgpu]
[ 7753.330867] amdgpu 0000:01:00.0: PM: device_prepare(): pci_pm_prepare+0x0/0x80 returns -12
[ 7753.330872] amdgpu 0000:01:00.0: PM: not prepared for power transition: code -12
[ 7753.799537] amdgpu 0000:01:00.0: PM: device_prepare(): pci_pm_prepare+0x0/0x80 returns -12
[ 7753.799544] amdgpu 0000:01:00.0: PM: not prepared for power transition: code -12
```
