[Bug 207619] New: Screen corrupt in Wayland and kmscube, like wrong stride / pitch, on Radeon X1400 RV515

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=207619

            Bug ID: 207619
           Summary: Screen corrupt in Wayland and kmscube, like wrong
                    stride / pitch, on Radeon X1400 RV515
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.7-rc4
          Hardware: x86-64
                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: boris.gjenero at gmail.com
        Regression: No

I have a Dell Inspiron 6400 laptop with ATI / AMD Mobility Radeon X1400
graphics (RV515/M54) and a 1680x1050 LCD panel. If run GNOME shell with
Wayland, Sway, Weston or kmscube, the screen is corrupt as if the pitch /
stride is wrong. In other words, the picture is as if drawing assumes one
number of bytes per line, and the GPU uses a different number of bytes per line
when outputting to the screen. As a result, the image is slanted and wrapped.
It's like a CRT with incorrect horizontal hold, except it's an LCD and the
image is always slanted the same way.

In GNOME the mouse cursor is perfectly fine. I assume GNOME uses the hardware
mouse cursor, which is not affected by this problem. This also shows that the
issue is in with how data is represented in memory, and not a lack of
horizontal hold between the GPU and LCD.

The fact the exact same kind of corruption happens in 4 different applications
seems to imply this is a kernel bug. I'm observing this in Ubuntu 20.04 x86-64,
both with its 5.4.0-29-generic kernel and their
5.7.0-050700rc4-generic_5.7.0-050700rc4.202005051752 from upstream.

I do not have this problem in Xorg.

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