[Bug 105188] Monitors don't always wake up after sleep

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=105188

            Bug ID: 105188
           Summary: Monitors don't always wake up after sleep
           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: mbartoszkiewicz@gmail.com

Created attachment 137497
  --> https://bugs.freedesktop.org/attachment.cgi?id=137497&action=edit
Kernel log

Hardware:
 GPU: Gigabyte Radeon RX 480 G1 Gaming 8GB
 Monitors: 3× Eizo FlexScan S2243W, connected using DP
Software:
 Distribution: Gentoo
 Kernel: 4.15.4
 x11-drivers/xf86-video-amdgpu-1.4.0
 x11-base/xorg-server-1.19.6
 media-libs/mesa-18.0.0_rc4
 x11-libs/libdrm-2.4.89

The monitors do not always correctly wake up from sleep.
E.g. after locking the session, the monitors go to sleep.
After pressing a key, only some wake up – the rest are still sleeping.
It does not seem to be deterministic – sometimes a monitor will wake up
correctly, sometimes not.

The kernel log attached is after running the following script:
for i in {1..5}; do echo "XXX before suspend $i" | sudo tee /dev/kmsg; xset
dpms force suspend; sleep 10; echo "XXX before on $i" | sudo tee /dev/kmsg;
xset dpms force on; sleep 10; echo "XXX status $i:" $(cat
/sys/devices/pci0000:00/0000:00:03.0/0000:03:00.0/drm/card0/card0-DP-*/status)
| sudo tee /dev/kmsg; done

I am not sure if it is directly related to this issue, but the kernel log
contains two refcount_t warnings in amdgpu code.

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