| Bug ID | 107456 |
|---|---|
| Summary | WARNING: CPU: 11 PID: 1137 at drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c:88 dm_dp_aux_transfer+0xa5/0xc0 [amdgpu] |
| Product | DRI |
| Version | unspecified |
| Hardware | x86-64 (AMD64) |
| OS | Linux (All) |
| Status | NEW |
| Severity | normal |
| Priority | medium |
| Component | DRM/AMDgpu |
| Assignee | dri-devel@lists.freedesktop.org |
| Reporter | marc@dragonfly.plus.com |
Created attachment 140936 [details]
dmesg output
I see the following warning during boot with Linux kernel 4.18.0-rc6 & 4.17.10:
root@deepthought:~# dmesg | grep WARN
[ 9.346100] WARNING: CPU: 11 PID: 1137 at
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c:88
dm_dp_aux_transfer+0xa5/0xc0 [amdgpu]
[ 9.346162] WARNING: CPU: 14 PID: 1139 at
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c:88
dm_dp_aux_transfer+0xa5/0xc0 [amdgpu]
Hardware is Ryzen 7 2700x, Sapphire Technology Radeon RX 480, IIyama ProLite
XB2380HS connected via DVI.
It looks like "dm_dp_aux_transfer" is used to setup DisplayPort, using "struct
drm_dp_aux_msg — DisplayPort AUX channel transaction". Now, with my hardware I
don't have any monitors connected via DisplayPort. Is that relevant?
I patched in a "printk("msg->size = %d\n", msg->size);" and it displays the
result twice, which is curious.
# dmesg | grep -i "msg->size"
[ 9.469511] msg->size = -5
[ 9.469803] msg->size = -5
Anyway, full "dmesg" attached.
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