Created attachment 138957 [details]
Xorg.0.log

Created attachment 138958 [details]
dmesg output

Created attachment 138959 [details]
lshw output

Created attachment 139069 [details] [review]
[PATCH 1/2] drm/amd/display: Update MST edid property every time

Created attachment 139070 [details] [review]
[PATCH 2/2] drm/amd/display: Check dc_sink every time in MST hotplug

Can you try patches 1 and 2?

Will do! Sorry, I haven't had much time for testing recently.

I cannot comment on how useful above patches are for the topic of this bug report, but they are helpful for bug report
https://bugs.freedesktop.org/show_bug.cgi?id=103277

Alright! First, I appreciate the help with this.

I decided to just roll with what I was being given and roll the kernel after applying the patches you'd recommended. I downloaded the newest unstable source this morning from here: git://kernel.ubuntu.com/ubuntu/unstable.git

did a make menuconfig to make sure that amdgpu.dc was included, along with custom processor flags for new core2/xeon processors, and then applied the patches you'd mentioned. Sadly, neither of them were verbatim because I've taken too long to get back to working on this, so I had to apply them manually.

You'll find my diff patches attached. Nothing overtly different.

I'm going to start compiling this, and then go to lunch. Thanks!

Created attachment 139100 [details] [review]
amdgpu_dm.c patch I had to manually apply

Created attachment 139101 [details] [review]
amdgpu_dm_mst_types.c patch I had to manually apply

It appears that the patch I manually created isn't working out so hot. During compiling, I'm seeing this error for amdgpu_dm_mst_types.c

drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c: In function ‘dm_dp_mst_dc_sink_create’:
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c:205:2: error: ‘dc_sink’ undeclared (first use in this function)
  dc_sink = dc_link_add_remote_sink(
  ^
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c:205:2: note: each undeclared identifier is reported only once for each function it appears in
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c:209:4: error: ‘init_params’ undeclared (first use in this function)
   &init_params);
    ^
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c: In function ‘dm_dp_mst_get_modes’:
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c:232:28: warning: unused variable ‘init_params’ [-Wunused-variable]
   struct dc_sink_init_data init_params = {
                            ^
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c:231:19: warning: unused variable ‘dc_sink’ [-Wunused-variable]
   struct dc_sink *dc_sink;
                   ^
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c:251:5: error: request for member ‘sink_signal’ in something not a structure or union
     .sink_signal = SIGNAL_TYPE_DISPLAY_PORT_MST };
     ^
scripts/Makefile.build:332: recipe for target 'drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.o' failed
make[4]: *** [drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.o] Error 1
scripts/Makefile.build:606: recipe for target 'drivers/gpu/drm/amd/amdgpu' failed
make[3]: *** [drivers/gpu/drm/amd/amdgpu] Error 2
scripts/Makefile.build:606: recipe for target 'drivers/gpu/drm' failed
make[2]: *** [drivers/gpu/drm] Error 2
scripts/Makefile.build:606: recipe for target 'drivers/gpu' failed
make[1]: *** [drivers/gpu] Error 2
make[1]: *** Waiting for unfinished jobs....

Could someone take a look at the file I've attached please?

Created attachment 139112 [details]
The modified file causing the problem in my comment.

Looks like there's some missing nomenclature between the patch you'd suggested, and the kernel source I acquired from git://kernel.ubuntu.com/ubuntu/unstable.git

Try the patches from this branch:
https://cgit.freedesktop.org/~agd5f/linux/log/?h=drm-fixes-4.17

Alex, I just rebooted to this kernel after building. This problem still exists, but it's not a hard freeze!

I'll attach the dmesg showing the error.

Created attachment 139132 [details]
This is the dmesg from an ssh session after attaching a monitor to my MST hub

root@nope:~/errors# uname -a
Linux nope 4.16.0-rc7+ #2 SMP Thu Apr 26 08:45:00 EDT 2018 x86_64 x86_64 x86_64 GNU/Linux

Kernel git acquired here: https://cgit.freedesktop.org/~agd5f/linux/log/?h=drm-fixes-4.17

Key message from dmesg:

[  526.900234] Call Trace:
[  526.900280]  dm_dp_mst_get_modes+0xce/0x120 [amdgpu]
[  526.900288]  drm_helper_probe_single_connector_modes+0x199/0x6c0 [drm_kms_helper]
[  526.900294]  ? jbd2_journal_stop+0xf3/0x3e0
[  526.900297]  ? __ext4_journal_stop+0x37/0xa0
[  526.900309]  drm_mode_getconnector+0x2c4/0x300 [drm]
[  526.900314]  ? _cond_resched+0x16/0x40
[  526.900324]  ? drm_mode_connector_property_set_ioctl+0x60/0x60 [drm]
[  526.900333]  drm_ioctl_kernel+0x67/0xb0 [drm]
[  526.900342]  drm_ioctl+0x2a9/0x350 [drm]
[  526.900352]  ? drm_mode_connector_property_set_ioctl+0x60/0x60 [drm]
[  526.900381]  amdgpu_drm_ioctl+0x46/0x80 [amdgpu]
[  526.900385]  do_vfs_ioctl+0xa2/0x5f0
[  526.900389]  ? vfs_write+0x162/0x1a0
[  526.900391]  SyS_ioctl+0x74/0x80
[  526.900395]  do_syscall_64+0x60/0x110
[  526.900399]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2

Created attachment 139134 [details]
Here's the kernel .config I used for making the kernel

Key changes:

I added AMDGPU module, checked all 4 boxes. Looks like amdgpu.dc switch is gone, assuming that's intentional.

I also checked the optimization for Intel Core 2/Xeon processors kernel checkbox instead of generic x86

I think we had a fix for that. Can you check if this is still a problem on https://cgit.freedesktop.org/~agd5f/linux/log/?h=amd-staging-drm-next

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