[Bug 87682] Horizontal lines in radeon driver on kernel 3.15 and upwards

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87682

            Bug ID: 87682
           Summary: Horizontal lines in radeon driver on kernel 3.15 and
                    upwards
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Drivers/Gallium/r600
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: qwrules at gmail.com

Created attachment 111292
  --> https://bugs.freedesktop.org/attachment.cgi?id=111292&action=edit
Youtube video depicting the artefacts.

This is what I get if I run any kernel newer than 3.14:
https://www.youtube.com/watch?v=nx2-Fvihzxg
Those artefacts appear as soon as new kernel is selected in GRUB, and remain
after logging into X session.

The last kernel working without artefacts is v3.15-rc2-trusty for Ubuntu, and
3.14.7 for Arch. All later kernels have those artefacts.

I updated mesa and xorg to those form ppaibaf/graphics-drivers ppa on Ubuntu,
and on using git version on Arch but it did not change a thing. This regression
is solely kernel-related.

GPU: Mobility Radeon HD 3200 (RS780M)
System tested: Arch, Ubuntu 14.04, 14.10
Kernels affected: 3.15 and onwards (tested up to 3.19-rc1)

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