[Bug 93446] New: [HD Graphics 3000] [SNA] TearFree option ineffective after screensaver, screen power-off

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93446

            Bug ID: 93446
           Summary: [HD Graphics 3000] [SNA] TearFree option ineffective
                    after screensaver, screen power-off
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: phillipedison1891 at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 120590
  --> https://bugs.freedesktop.org/attachment.cgi?id=120590&action=edit
Contains Dmesg contents (with drm.debug=0x06) and Xorg log

My Samsung laptop screen experiences tearing when using SNA acceleration in
Ubuntu 15.10.  Setting "TearFree" to "true" in the X configuration fixes
this... but when certain things happen, the tearing comes back, and the only
way to stop it is to log out and log back in, which restarts the X server.  The
aforementioned certain things are:

* mate-screensaver is activated
* Screen powers off after a period of time, per Ubuntu power settings

Activating the MATE screensave alone doesn't break it, and neither does just
letting the screen power off.  *Both* have to happen to break the TearFree.

I have attached a tarball containing both the dmesg contents (with drm debug
lever 0x06) and the X log.

Best wishes,
Phillip

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