[Bug 59661] New: Screen freezes periodically in interlaced modes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59661

          Priority: medium
            Bug ID: 59661
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: Screen freezes periodically in interlaced modes
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: grossmms at googlemail.com
          Hardware: x86 (IA32)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 73379
  --> https://bugs.freedesktop.org/attachment.cgi?id=73379&action=edit
xorg.conf

When running a program using the DRI on a screen with an interlaced
video mode, the screen freezes periodically, i.e. every screen update
stops, even the movement of the cursor. This occurs approximately
every 10 seconds and lasts for about half a second. Everything else,
e.g. audio output, appears to run normally.

The symptoms apparently are the same as those of bug 45674, but I'm
seeing this issue only when using an interlaced video mode.

System environment:

-- chipset: 945GSE
-- system architecture: 32-bit
-- xf86-video-intel: 2.19.0
-- xserver: 1.12.4
-- mesa: 8.0.5
-- libdrm: 2.4.40
-- kernel: 3.7.1
-- Linux distribution: Debian Wheezy (kernel from experimental)
-- Machine or mobo model: Intel D945GSEJT
-- Display connector: VGA

Reproducing steps:

- Start X with an interlaced video mode (see xorg.conf for the
  Modeline I'm using)
- Make sure that the DRI is in use (e.g. by activating desktop
  effects in KDE)
- Start a program which countinously produces output or watch a 
  video or just move the cursor around

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