[Bug 81422] New: [G33] blank screen with KMS on DVI output

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81422

          Priority: medium
            Bug ID: 81422
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [G33] blank screen with KMS on DVI output
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: minor
    Classification: Unclassified
                OS: Linux (All)
          Reporter: krzysiek at podlesie.net
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 102911
  --> https://bugs.freedesktop.org/attachment.cgi?id=102911&action=edit
dmesg (Linux drm-intel-fixes-2014-07-09)

Hi,

the kernel with KMS does not initialize the display correctly on some old
all-in-one PC with G33 chipset. The kernel reports some errors, including "SDVO
pixel multiplier mismatch" and "VGA-1: EDID block 0 invalid", however the
display seems to be connected using DVI1 port.

The monitor seems to report some strange mode 1024x819 which is used by
default. However setting the mode to 1024x768 at 60 Hz does not fix the
problem. The screen is blank both with the fbcon and the X server.

# xrandr
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 32767 x 32767
VGA1 disconnected (normal left inverted right x axis y axis)
DVI1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 376mm x
301mm
   1024x768       75.1 +   75.0     70.1     60.0*
   1024x819       75.0
   800x640        75.0
   800x600        75.0     60.3
   640x480        75.0     72.8     60.0
   720x400        70.1
HDMI1 disconnected (normal left inverted right x axis y axis)

I've tested Linux 3.12.9, 3.15.4 and drm-intel-fixes-2014-07-09. I'm attaching
the dmesg from Linux drm-intel-fixes-2014-07-09 with drm.debug=0xe.

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