[amdgpu SI] purple line is visible on left side of the screen connected by HDMI

Submitted by Arek Ruśniak

Assigned to Default DRI bug account

Link to original bug (#97861)

Description

Created attachment 126615
the purple line

kernel - 3 days old drm-next-4.9-wip
mesa/llvm/libdrm - latest
xorg - 1.18.4 / ~1.19

I have two displays: DVI monitor, always "on" and HDMI (TV) usually "off".

When i turn on HDMI screen:
$xrandr --output DVI-I-1 --primary --mode 1680x1050 --output HDMI-A-0 --mode 1920x1080

On left side TV screen appears purple vertical line.

1. this is 80-90% bug 91041, but amdgpu here and srcreen isn't blurry
   $xrandr --output HDMI-A-0 --auto --set audio off
   works for me
   
2. option audio=0 did the job as well
   
3. Before Xorg/wayland start tty's are clean&black after X/wayland purple line is visible.
   
4. problem is probably related to hdmi-audio so i don't even know if it's bug at all
   

**Attachment 126615**, "the purple line":