[Bug 56681] New: linux 3.8, i915, display port @ 2560x1440

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=56681

           Summary: linux 3.8, i915, display port @ 2560x1440
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.8.x+
          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: mitnworb at gmail.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No


I'm using a monitor with DisplayPort cable. The maximal resolution of that
monitor is 2560x1440. When using a 3.7 Linux kernel everything works
like a charm.  With all the 3.8 kernels I have tried (the "official"
Arch kernels 3.8.3 and 3.8.4), I'm not longer able to use that
resolution. The maximal resolution I can get is 1920x1080 (the same
aspect ratio that the native LCD which is 1366x768).

When using the 3.8+ kernel, the machine boots but when X starts, it just
produces a black screen or a static screen that is kind of readable. I have 
tried downgrading the X server, xf86-video-intel, and intel-dir without any
change (I'm currently using xf86-video-intel 2.21.6-1, intel-dri 9.1.1-1, and
xorg-server 1.14.0-2).

Downgrading to Linux 3.7.10-1-ARCH had solved the problem.

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