[Bug 203731] New: amdgpu wrong refresh rate for hdmi output with deepcolor turned on

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=203731

            Bug ID: 203731
           Summary: amdgpu wrong refresh rate for hdmi output with
                    deepcolor turned on
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.19.45
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: sss123next at list.ru
        Regression: No

Created attachment 282971
  --> https://bugzilla.kernel.org/attachment.cgi?id=282971&action=edit
xorg server log

i have 3 display setup (dvi, dp, hdmi), displays on dp and hdmi are 10bit
displays, if i turn on deepcolor option on amdgpu driver, hdmi display got
wrong refresh rate (looks too low), display supported 1920x1200 at 60 mode, in
xorg.log we can see what it detected properly, but instead of this display got
like 40hz, and turn black with out of range error, i have played a bit with
modes, and found what  mode "xrandr --newmode "1920x1200_73.48"  240.00  1920
2064 2264 2608  1200 1203 1209 1254 -hsync +vsync" works, display also warns
about out of range mode (58.7hz), but actually works, NOTE: this all happens
only if deepcolor driver option is turned on.

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