[Bug 105725] WARNING: CPU: 0 PID: 487 at drivers/gpu/drm/amd/amdgpu/../display /dc/gpio/gpio_base.c:64 dal_gpio_open_ex+0xc/0x30 [amdgpu]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105725

--- Comment #4 from hjpriester at gmail.com ---
Harry,

I have build a kernel using the:

    git clone -b drm-next-4.17-wip git://people.freedesktop.org/~agd5f/linux

I did the clone about 2018-29-03 20:00 UTC  

The warnings are still there.
root at hjp2:~# dmesg | grep -i Warning
[    0.000000] ACPI BIOS Warning (bug): Optional FADT field Pm2ControlBlock has
valid Length but zero Address: 0x0000000000000000/0x1 (20180105/tbfadt-658)
[    5.351226] WARNING: CPU: 1 PID: 491 at
drivers/gpu/drm/amd/amdgpu/../display/dc/gpio/gpio_base.c:64
dal_gpio_open_ex+0xc/0x30 [amdgpu]
[    5.353376] WARNING: CPU: 1 PID: 491 at
drivers/gpu/drm/amd/amdgpu/../display/dc/gpio/gpio_service.c:487
dal_ddc_open+0x2c/0xd0 [amdgpu]

I never get the hang during a boot. I will report that as a separate bug.

The display I am using is a IIYama Prolite XUB2792QSU using Displayport.
It it a 27" 2560x1440 monitor.
The distrubution is Slackware-current. ("pre 15.0")

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