[Bug 100919] "Out of range" on a display connected to a DVI-D output of RX460 card via DVI-D<=>HDMI-A cable

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100919

            Bug ID: 100919
           Summary: "Out of range" on a display connected to a DVI-D
                    output of RX460 card via DVI-D<=>HDMI-A cable
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: nikola.forro at gmail.com

I'm using the latest code from amd-staging-4.9 branch of ~agd5f/linux.

The problem is caused by this commit:
https://cgit.freedesktop.org/~agd5f/linux/commit/?h=amd-staging-4.9&id=2b2d4cfb0a629961a44e1ea0b29d336c1336deb9

After this change, when sink_signal is DVI_DUAL_LINK but pix_clk_khz is lower
than TMDS_MAX_PIXEL_CLOCK_IN_KHZ, stream->signal is set to DVI_DUAL_LINK, while
previously it was being set to DVI_SINGLE_LINK.

As a result, the connected display just reports "Out of range" error.

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