[Bug 109006] Hotplugging DP1.2 monitor(s) causes machine to hang waiting for page flip

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=109006

Martin Peres  changed:

   What|Removed |Added

 Status|NEW |RESOLVED
 Resolution|--- |MOVED

--- Comment #2 from Martin Peres  ---
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[Bug 109006] Hotplugging DP1.2 monitor(s) causes machine to hang waiting for page flip

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=109006

--- Comment #1 from Robert Straw  ---
I was going to attempt to bisect this tonight: however on a lark I decided to
try 4.20-rc6 as it is nearing completion. I am pleased to report that I am
*not* seeing this issue on 4.20-rc6. I suspect that the kernel commit a81a7c9
which loads polaris11_k_mc.bin (which I got from here[1]) for my particular
card may have fixed the issue.

[1]: https://people.freedesktop.org/~agd5f/radeon_ucode/

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[Bug 109006] Hotplugging DP1.2 monitor(s) causes machine to hang waiting for page flip

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=109006

Bug ID: 109006
   Summary: Hotplugging DP1.2 monitor(s) causes machine to hang
waiting for page flip
   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: h...@is.fucking.moe

Created attachment 142774
  --> https://bugs.freedesktop.org/attachment.cgi?id=142774&action=edit
dmesg: DRM call stack

Greetings,

I am using kernel 4.19.8, I have two 4K panels which have DP1.2 inputs as well
as an AMD RX560 GPU[1]. I am experiencing an issue where my machine softlocks
when they are disconnected & subsequently reconnected. If the monitors are
power-cycled ,or the DP cable is hotplugged, my kernel log slowly accumulates
messages like "*ERROR* [PLANE:36:plane-0] flip_done timed out" meanwhile my
graphical environment hangs, waiting for the pageflip which never successfully
happens. One of my monitors also happens be HDMI2.0 capable, and when connected
via HDMI that monitor *does not* lock up the machine in this way, so I believe
this issue to be DisplayPort specific.

Attached is a dmesg from a recent session exhibiting such a softlock, the
relevant portions are near the end. All my softlocks have `RIP:
0010:prepare_flip_isr+0x5f/0x70 [amdgpu]` in common. I will note that the
driver does seem to at least partially initialize the monitors upon
reconnection, as they do not display "no signal" nor enter sleep mode.


[1]: Advanced Micro Devices, Inc. [AMD/ATI] Baffin [Radeon RX 550 640SP / RX
560/560X] [1002:67ff] (rev cf)

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