[Bug 52361] New: External Monitor is not detected

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=52361

           Summary: External Monitor is not detected
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.6.0 - 3.8.0-rc2
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
        AssignedTo: intel-gfx-bugs at lists.freedesktop.org
        ReportedBy: norman at smash-net.org
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: Yes


An external monitor is connected via an DVI to DP Adapter to the Display Port.
Till kernel 3.5.4 the external monitor is detected and works as expected.
On kernel 3.6.0 - 3.8.0-rc2 the monitor is not responding on startup nor is it
detected on xrandr. Monitor say "no signal" and goes to stand by.

Following Controller is used. Machine is a Lenovo x301.

00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset
Integrated Graphics Controller (rev 07) (prog-if 00 [VGA controller])
    Subsystem: Lenovo Device 20e4
    Flags: bus master, fast devsel, latency 0, IRQ 42
    Memory at f0000000 (64-bit, non-prefetchable) [size=4M]
    Memory at d0000000 (64-bit, prefetchable) [size=256M]
    I/O ports at 1800 [size=8]
    Expansion ROM at <unassigned> [disabled]
    Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
    Capabilities: [d0] Power Management version 3
    Kernel driver in use: i915

00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset
Integrated Graphics Controller (rev 07)
    Subsystem: Lenovo Device 20e4
    Flags: bus master, fast devsel, latency 0
    Memory at f0400000 (64-bit, non-prefetchable) [size=1M]
    Capabilities: [d0] Power Management version 3

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