[Bug 53490] New: [bisected] bump map corruption from kernel 3.5

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=53490

             Bug #: 53490
           Summary: [bisected] bump map corruption from kernel 3.5
    Classification: Unclassified
           Product: Mesa
           Version: 7.11
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
        AssignedTo: dri-devel at lists.freedesktop.org
        ReportedBy: joeri at capens.net


Created attachment 65540
  --> https://bugs.freedesktop.org/attachment.cgi?id=65540
Portal 2 screenshot - good

After updating my Linux kernel to 3.5.0 I'm seeing bump map corruption in
Portal 2. See attachments.

I bisected it down to commit 416a2bd274566a6f607a271f524b2dc0b84d9106 -
drm/radeon: fixup tiling group size and backendmap on r6xx-r9xx (v4)

My GPU is a Radeon HD 5670 (Evergreen, Redwood) and I'm using Gallium (for
R600) on Gentoo Linux AMD64.

If I disable bump mapping in Portal 2 (command "mat_bumpmap 0") the corruption
goes away, but obviously the walls and objects appear flatter.

Mesa, libdrm, xf86-video-ati or Wine versions don't seem to matter. I tested
some combinations of Mesa 7.11.2 and 8.0.4, libdrm 2.4.27, 2.4.33 and 2.4.38,
xf86-video-ati 6.14.4 and 6.14.6, Wine 1.5.9 and 1.5.10.

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