[Bug 65192] New: Screensavers lock up machine (screen goes blank, keyboard unresponsive, sound loops; sysrq/ssh possible)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65192

          Priority: medium
            Bug ID: 65192
          Assignee: dri-devel at lists.freedesktop.org
           Summary: Screensavers lock up machine (screen goes blank,
                    keyboard unresponsive, sound loops; sysrq/ssh
                    possible)
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: luziphermcleod at yahoo.ie
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Drivers/Gallium/r600
           Product: Mesa

For a while now, some screensavers sometimes lock up my machine. That means all
screens go blank, the keyboard is unresponsive (numpad-key doesn't toggle the
indicator led), the sound loops. But I still can use ssh from a remote machine
and the magic-sysrq-keys also work.

There is nothing to see in neither /var/log/messages (acquired via netconsole)
nor /var/log/Xorg.0.log.

I can trigger the bug (or regression, I think it used to work about 2 months
ago) reliably by using the Xfce4 screensaver settings application, which has a
preview of the screensaver selected. When switching between screensavers, the
lockup quickly occurs. A good candidate is the screensaver named "AntMaze", it
alsmost always locks up my machine (only worked once so far).
Other stuff works quite solid, Half-Life 2 worked multiple hours today.

Setting R600_HYPERZ=0 in /etc/environment didn't help. Also occurs on kernel
3.8.0-rc7.

I'm happy to provide more info if needed.



System Specs:
Intel Core i7-965
2x Radeon HD4870 (rv770, currently only one active without xorg.conf), 2
Monitors

Gentoo Linux
Kernel 3.10.0-rc3
Mesa 9.2.0 (git-60f9b72) git commit 60f9b722ef80c499a94b4e5ab7304dcd739ea569
Revert "i965: fix problem with constant out of bounds access (v2)"
xorg-server-1.14.1
libdrm git commit 8a88e349975a64676f143183e835e6d296f29627 modetest: Make
RGB565 pwetty too
xf86-video-ati git commit commit bd2557ea5ef84b975060e929d5ece53ec464336f DRI2:
add interpolated blanks to frame number in event handlers

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