[Bug 81170] New: sporadic white screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81170

          Priority: medium
            Bug ID: 81170
          Assignee: chris at chris-wilson.co.uk
           Summary: sporadic white screen
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: FreeBSD
          Reporter: guru at unixarea.de
          Hardware: Other
            Status: NEW
           Version: 7.7 (2011)
         Component: Driver/intel
           Product: xorg

Hello,

I run on an Acer Aspire One D250 netbook the following system:

$ uname -a
FreeBSD La-Habana 10.0-CURRENT FreeBSD 10.0-CURRENT #0 r250588M: Sat Jun 22
14:15:48 CEST 2013    
guru at La-Habana:/usr/obj/usr/home/guru/head/src/sys/GENERIC  i386

$ pkg_info | fgrep xorg
xorg-7.7            X.Org complete distribution metaport
xorg-apps-7.7       X.org apps meta-port
xorg-docs-1.7,1     X.org documentation files
xorg-drivers-7.7    X.org drivers meta-port
xorg-fonts-100dpi-7.7 X.Org 100dpi bitmap fonts
xorg-fonts-7.7      X.org fonts meta-port
xorg-fonts-75dpi-7.7 X.Org 75dpi bitmap fonts
xorg-fonts-cyrillic-7.7 X.Org Cyrillic bitmap fonts
xorg-fonts-miscbitmaps-7.7 X.Org miscellaneous bitmap fonts
xorg-fonts-truetype-7.7 X.Org TrueType fonts
xorg-fonts-type1-7.7 X.Org Type1 fonts
xorg-libraries-7.7  X.org libraries meta-port
xorg-macros-1.17    X.Org development aclocal macros
xorg-server-1.7.7_6,1 X.Org X server and related programs
linux-f10-xorg-libs-7.4_1 Xorg libraries (Linux Fedora 10)

and on top of this KDE 3.5.10, but I think this is unrelated to the
problem:

sporadic the screen turns to white; the system is still running and I can:

a) SSH into it from LAN
b) switch with Ctrl-Alt-F1 to the alphanumeric console which is
   displayed fine and works
c) from alphanumeric with Alt-F9 back to the X11 screen, which is black
d) toggle between F1 - F9 (F9 stays black)
e) can zap the X11-server with Ctrl-Alt-Backspace, which returns to
   alphanumeric console, and can startx there again the X11-chain fine

Of course, zapping means loosing all open files in vim or pages in browser
and is not want I want.

One can think in a hardware fault, broken LCD cable or whatever, but why
then the alphanumeric console is fine and X11 starts fine again?

And, is there some way to re-init the screen in X11 again to not zap it
and loose the session?

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