[Bug 101387] amdgpu display corruption and hang on AMD A10-9620P

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101387

--- Comment #3 from Carlo Caione <carlo at caione.org> ---
> Looks like amdgpu_atombios_crtc_powergate_init scribbles over the stack.
Yeah, and while this is causing the panic this is not related to the display
corruption.

The garbage lines we see at boot seem to be displayed at the same time when in
the log we have:

[drm] amdgpu atom DIG backlight initialized
[drm] AMDGPU Display Connectors
[drm] Connector 0:
[drm]   eDP-1
[drm]   HPD1
[drm]   DDC: 0x4868 0x4868 0x4869 0x4869 0x486a 0x486a 0x486b 0x486b
[drm]   Encoders:
[drm]     LCD1: INTERNAL_UNIPHY
[drm] Connector 1:
[drm]   HDMI-A-1
[drm]   HPD2
[drm]   DDC: 0x486c 0x486c 0x486d 0x486d 0x486e 0x486e 0x486f 0x486f
[drm]   Encoders:
[drm]     DFP1: INTERNAL_UNIPHY
[drm] amdgpu atom DIG backlight initialized
[drm] AMDGPU Display Connectors
[drm] Connector 0:
[drm]   eDP-1
[drm]   HPD1
[drm]   DDC: 0x4868 0x4868 0x4869 0x4869 0x486a 0x486a 0x486b 0x486b
[drm]   Encoders:
[drm]     LCD1: INTERNAL_UNIPHY
[drm] Connector 1:
[drm]   HDMI-A-1
[drm]   HPD2
[drm]   DDC: 0x486c 0x486c 0x486d 0x486d 0x486e 0x486e 0x486f 0x486f
[drm]   Encoders:
[drm]     DFP1: INTERNAL_UNIPHY


> What kind of artifacts in plymouth?
https://pasteboard.co/hWu18yPj0.jpg

> Does e.g. X work correctly?
Yes, disabling the stack protection xorg works fine (no panic, but I still have
the display corruption at boot and on poweroff/reboot)

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