[Bug 105534] amdgpu cannot set 2560x1440 at 60 mode even though monitor,gpu and motherboard support it

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105534

--- Comment #7 from philipmorant at gmail.com ---
There are 3 physical motherboard sockets: HDMI, DVI DL, and D-SUB.
xrandr reports the D-SUB as DisplayPort-0.

In kernel versions before 4.10 I used to have to hack the i915 code as follows
 (in intel_hdmi.c):

@@ -849,7 +849,7 @@ static int hdmi_portclock_limit(struct intel_hdmi *hdmi,
bool respect_dvi_limit)
{
    struct drm_device *dev = intel_hdmi_to_dev(hdmi);

-   if ((respect_dvi_limit && !hdmi->has_hdmi_sink) || IS_G4X(dev))
+   if (IS_G4X(dev))
       return 165000;
    else if (IS_HASWELL(dev) || INTEL_INFO(dev)->gen >= 8)
       return 300000;

After 4.10 came out the hack became unnecessary.

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