[Bug 96868] New: AMDGPU Tonga only does 2560x1440 at 120hz, switching to 144hz causes display errors, same thing used to happen with fglrx.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96868

            Bug ID: 96868
           Summary: AMDGPU Tonga only does 2560x1440 at 120hz, switching
                    to 144hz causes display errors, same thing used to
                    happen with fglrx.
           Product: xorg
           Version: 7.7 (2012.06)
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/AMDgpu
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: almoped at gmail.com
        QA Contact: xorg-team at lists.x.org

Using the opensource AMDgpu driver with an AMD R9 380 on a Benq XL2730Z causes
major display corruption when set to native resolution and a 144hz refresh
rate.

The same problem used to occur with fglrx, but had been fixed recently.

On the, now working, fglrx system xvidtune shows the modeline:
"2560x1440"   586.00   2560 2568 2600 2640   1440 1465 1473 1543 +hsync -vsync

Running xvidtune on the AMDgpu system shows the exact same current modeline.
Only this time the screen flickers constantly and just the top ~13% of the
screen is somewhat visible, every line below is unstable, interlaced,
corrupted.

Setting the display to 120hz gives a modeline:
"2560x1440"   482.64   2560 2568 2600 2640   1440 1447 1455 1525 +hsync -vsync
And seems to work just fine. The same goes for 100 and 60Hz.

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