[Bug 92691] New: When i915.fastboot=1, incorrect mode is reported

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=92691

            Bug ID: 92691
           Summary: When i915.fastboot=1, incorrect mode is reported
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.18.5
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: maxtram95 at gmail.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

My bootloader (syslinux) leaves the screen in 80×25 text mode. I have no fbcon
module loaded, only i915. Then Xorg starts with lightdm greeter, my screen's
resolution appears to be 640×480, but Xorg thinks it is 1024×600 ("xrandr
--current" says so). I can only see top left corner of the picture. When I move
my mouse to the right edge of the screen, flickering starts until I return my
mouse back.

If I boot without i915.fastboot=1, native resolution 1024×600 is set.

So the issue is that with i915.fastboot=1 real resolution set (640×480) differs
from the one reported by driver (1024×600).

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