[Bug 61642] New: LVDS doesn't come back after "xrandr --output LVDS1 --off; xrandr --output LVDS1 --auto"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=61642

          Priority: medium
            Bug ID: 61642
          Assignee: chris at chris-wilson.co.uk
           Summary: LVDS doesn't come back after "xrandr --output LVDS1
                    --off; xrandr --output LVDS1 --auto"
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: cworth at cworth.org
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

I found this behavior consistnent with kernels 3.6.11, 3.8.0, and 3.8.1

With an external monitor plugged into my Lenovo x220 I can turn the LVDS
off with:

    xrandr --output LVDS1 --off

And this works as expected, (LVDS display turns off). But when I try
to turn it on again with:

    xrandr --output LVDS1 --auto

nothing comes on. This is in spite of the fact that xrandr does report
that the LVDS output is on at this point:

    $ xrandr | grep -A1 LVDS1
    LVDS1 connected 1366x768+0+0 (normal left inverted right x axis y axis)
277mm x 156mm
       1366x768       60.0*+

At this point things appear entirely off, (it does not appear to be a
case where just the backlight is off, for example).

Note that I can cause the LVDS display to turn on by issuing a modeset,
such as:

    xrandr --output LVDS1 --mode 1024x768

At this point my display turns on again, and then finally I can get
the mode I want back with:

    xrandr --output LVDS1 --auto

Please let me know if you need any further information, and I'll be
happy to supply it.

Thanks,

-Carl

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