[Bug 97857] New: card detects non-existent monitor on display port

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97857

            Bug ID: 97857
           Summary: card detects non-existent monitor on display port
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: danadam7 at gmail.com
        QA Contact: xorg-team at lists.x.org

My graphic card is:

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM]

I have one monitor connected to DVI port. Since kernel 4.5.0-2 my Xorg.0.log
shows that something is also connected to display port, here's a diff of the
log between kernel 4.5.0-1 and 4.5.0-2:

 (II) RADEON(0): EDID for output DisplayPort-0
+(II) RADEON(0): Printing probed modes for output DisplayPort-0
+(II) RADEON(0): Modeline "1024x768"x60.0   65.00  1024 1048 1184 1344  768 771
777 806 -hsync -vsync (48.4 kHz e)
+(II) RADEON(0): Modeline "800x600"x60.3   40.00  800 840 968 1056  600 601 605
628 +hsync +vsync (37.9 kHz e)
+(II) RADEON(0): Modeline "800x600"x56.2   36.00  800 824 896 1024  600 601 603
625 +hsync +vsync (35.2 kHz e)
+(II) RADEON(0): Modeline "848x480"x60.0   33.75  848 864 976 1088  480 486 494
517 +hsync +vsync (31.0 kHz e)
+(II) RADEON(0): Modeline "640x480"x59.9   25.18  640 656 752 800  480 490 492
525 -hsync -vsync (31.5 kHz e)
 (II) RADEON(0): EDID for output HDMI-0
 (II) RADEON(0): EDID for output DVI-0
...
-(II) RADEON(0): Output DisplayPort-0 disconnected
+(II) RADEON(0): Output DisplayPort-0 connected
 (II) RADEON(0): Output HDMI-0 disconnected
 (II) RADEON(0): Output DVI-0 connected
-(II) RADEON(0): Using exact sizes for initial modes
-(II) RADEON(0): Output DVI-0 using initial mode 1920x1200 +0+0
+(II) RADEON(0): Using fuzzy aspect match for initial modes
+(II) RADEON(0): Output DisplayPort-0 using initial mode 1024x768 +0+0
+(II) RADEON(0): Output DVI-0 using initial mode 1024x768 +0+0
 (II) RADEON(0): Using default gamma of (1.0, 1.0, 1.0) unless otherwise
stated.
...
-(II) RADEON(0): Setting screen physical size to 508 x 317
+(II) RADEON(0): Setting screen physical size to 270 x 203

As a result my display manager (sddm) loads in 1024x768 resolution. It goes
back to normal, i.e., 1920x1200 when I log in and KDE loads up.

When I explicitly disable DisplayPort by adding video=DP-1:d to kernel options,
everything goes back to normal.


My original issue was with geometry of my console (
https://lists.debian.org/debian-user/2016/06/msg00851.html ), so the problem
might be somewhere deeper than xorg.

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