[Bug 213129] New: Tiny font

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=213129

            Bug ID: 213129
           Summary: Tiny font
           Product: Drivers
           Version: 2.5
    Kernel Version: Tiny font during kernel boot with multihead
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: thoralf.dassler at gmail.com
        Regression: No

Created attachment 296833
  --> https://bugzilla.kernel.org/attachment.cgi?id=296833&action=edit
relev_out

The following issue started with the 5.10.33 vanilla kernel (currently I am on
5.10.37 vanilla). I get my kernels (incl. firmware, modules and headers)
through my distro.

My graphics card is a Radean RX 560, on which I use all three heads:
DisplayPort 1.2, HDMI and DVI.


Here is the issue:
------------------
At the beginning of the kernel boot process, the frame buffer fonts on all
three heads are normal size. But as soon as amdgpu takes over during the boot
process, the font on the DisplayPort changes to this:
1) the fontsize goes tiny;
2) only the upper-left quadrant of DisplayPort is used.

Fonts on the other two heads are unaffected.

When I disconnect the cables from HDMI and DVI, so that I only use DisplayPort,
then fonts remain of a good size and the full screen area is used.

I attach the relevant output of lspci and dmesg, with all heads connected.

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