[drm:amdgpu_get_bios [amdgpu]] *ERROR* ACPI VFCT table present but broken (too short #2)

[Dennis Schridde]

Hi!

I am seeing messages like the following during startup:

[drm:amdgpu_get_bios [amdgpu]] *ERROR* ACPI VFCT table present but broken (too 
short #2)
AMD-Vi: Event logged [IO_PAGE_FAULT device=00:00.0 domain=0x0000 
address=0x00000000fffc0000 flags=0x0070]
[drm:dce_v11_0_set_pageflip_irq_state [amdgpu]] *ERROR* invalid pageflip crtc 
5
[drm:amdgpu_irq_disable_all [amdgpu]] *ERROR* error disabling interrupt (-22)
amdgpu 0000:01:00.0: Fatal error during GPU init
[TTM] Memory type 2 has not been initialized

The first message always appears, while the others are not as easily 
reproducable.

Other weird behaviour I notice is:
* Hangs of the entire system when I start Steam using `env DRI_PRIME=1 steam` 
(nothing reacts to commands anymore, including mouse clicks, the power button 
and the num-lock key, and the mouse cursor moves very sluggishly)
* Crashes of KWin when using Alt+Tab [1]
* The firmware and GRUB (and Linux, initially) display at 1024x768, while the 
monitor's native resolution is 2560x1080.  After the Linux kernel takes over, 
the monitor switches back to the native resolution.

I would hope that someone could guide me in gathering more information about 
this and in the best case getting additional output or a backtrace from the 
kernel, please.

Please find the full output of dmesg, lshw, lspci, glxinfo attached.  Since 
the second card (RX 560) did not come up during this boot, I could not include 
the output of glxinfo for that card (`env DRI_PRIME=1 glxinfo`) at this time.

I run Gentoo Linux with following software:
* Linux 4.13.8
* Mesa 17.2.3
* LLVM 5.0.0

I have two graphics cards plugged in:
* AMD Radeon R7 / AMD A10-7800
* AMD Radeon RX 560

The monitor is connected via Display Port to the first card (R7).

If more information would be helpful, please tell me how and I will try to 
acquire it.

--Dennis

[1]: https://bugs.freedesktop.org/show_bug.cgi?id=103234
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