[Bug 106735] [amdgpu] all displays reconnect after failed EDID read

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106735

            Bug ID: 106735
           Summary: [amdgpu] all displays reconnect after failed EDID read
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: mail at matthias-kastner.de

Created attachment 139861
  --> https://bugs.freedesktop.org/attachment.cgi?id=139861&action=edit
dmesg

I am on ubuntu 18.04 LTS on gnome3 with X.org. I am using amdgpu with a Raden
RX 580.

> $ lspci -k | grep -EA3 'VGA|3D|Display'
> 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480] (rev e7)
> 	Subsystem: ASUSTeK Computer Inc. Ellesmere [Radeon RX 470/480/570/580]
> 	Kernel driver in use: amdgpu
> 	Kernel modules: amdgpu

> $ uname -r
> 4.15.0-22-generic

>  $ lsb_release -a
> No LSB modules are available.
> Distributor ID:	Ubuntu
> Description:	Ubuntu 18.04 LTS
> Release:	18.04
> Codename:	bionic

Two screens for working are connected via DVI and HDMI.
One HDMI output is connected to a PlayStation VR Headset. The Headset redirects
all input to the TV but it is mostly turned off.

When turned off but connected to the HDMI output, frequent EDID read fails are
reported to syslog:

> [drm:log_to_debug_console [amdgpu]] *ERROR* No EDID read.

When un-plugging the PSVR Headset from HDMI the errors vanish. After the EDID
read there is the HMD related messages like

> [    3.066968] [drm:log_to_debug_console [amdgpu]] *ERROR* No EDID read.
> [    3.091884] [drm] SIE  HMD *08: [Block 0] 
> [    3.091886] [drm] SIE  HMD *08: [Block 1] 
> [    3.091890] [drm] dc_link_detect: manufacturer_id = D94D, product_id = B403, > serial_number = 1010101, manufacture_week = 38, manufacture_year = 27, display_name = SIE  HMD *08, speaker_flag = 15, audio_mode_count = 4
> [    3.091896] [drm] dc_link_detect: mode number = 0, format_code = 1, channel_count = 6, sample_rate = 87, sample_size = 7
> [    3.091899] [drm] dc_link_detect: mode number = 1, format_code = 2, channel_count = 6, sample_rate = 7, sample_size = 80
> [    3.091902] [drm] dc_link_detect: mode number = 2, format_code = 7, channel_count = 6, sample_rate = 7, sample_size = 188
> [    3.091905] [drm] dc_link_detect: mode number = 3, format_code = 10, channel_count = 8, sample_rate = 4, sample_size = 0

All connected Screens then reconnect: They turn black and the position of the
screens (which is left and which is right screen) is sometimes also reset. This
is annoying during productive work.

My point is that I don't mind if there is no EDID from the PSVR HeadSet or any
of the connected devices. The headset is turned off and As I see it, it should
only check for the EDID when I turn it on.

The only quick solution here is to unplug the Headset while on Linux.

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