[Bug 52281] New: [bisected Regression] Image on external VGA Monitor ASUS V222U too big (zoomed)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=52281

           Summary: [bisected Regression] Image on external VGA Monitor
                    ASUS V222U too big (zoomed)
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.6-rc4 and later
          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: florian at mickler.org
                CC: intel-gfx-bugs at lists.freedesktop.org
            Blocks: 49741
        Regression: Yes


Created an attachment (id=90401)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=90401)
dmesg of booting vanilla v3.7 kernel

Hi,

I found that a quirk merged in v3.6-rc4 distorts the image displayed on my
external vga monitor. This symptom begins as soon as the kernel takes over
control over the graphic stack.

The symptom is that the image which is displayed on the external VGA (an ASUS
V222U) is 1 inch too big on either side of the display. As if it was zoomed in
on the center. (The image is more pixely than normal too, as a result of the
'zooming')


Reverting the commit 

commit 6f33814bd4d9cfe76033a31b1c0c76c960cd8e4b
Author: Paul Menzel <paulepanter at users.sourceforge.net>
Date:   Wed Aug 8 23:12:19 2012 +0200

    drm: Add EDID_QUIRK_FORCE_REDUCED_BLANKING for ASUS VW222S

fixes the issue.

I attach dmesg with drm.debug=6 and xorg.0.log from v3.7 kernels with and
without the revert.

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