[Bug 81951] New: gma500_gfx: "No Signal" to monitor on boot

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=81951

            Bug ID: 81951
           Summary: gma500_gfx: "No Signal" to monitor on boot
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.13.0
          Hardware: IA-32
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: linux at iam.tj
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

Created attachment 145901
  --> https://bugzilla.kernel.org/attachment.cgi?id=145901&action=edit
DSA-3020 dmesg with ""video=DVI-D-1:1920x1080D"

I've just been assisting a user with an Advantech DSA-3020 board [1][user
manual] which
has the Poulsbro chip-set and uses the gma500_gfx driver on a small embedded
server currently running Ubuntu 14.04.1 LTS.

The device has 2 outputs: LVDS-1 and DVI-D-1. Nothing is connected to LVDS-1. A
1920x1080 monitor is connected to DVI-D-1.

During POST and bootloader the display is on DVI-D-1. As soon as gma500_gfx
initialises the DVI-D-1 display reports "No Signal". Nothing we've done in
diagnosing this has helped.

One workaround is to blacklist gma500_gfx and allow the vesafb driver to handle
the GPU. The other is to totally disable ACPI in BIOS. If ACPI is enabled in
BIOS but disabled in the OS ("acpi=off") the symptoms still occur. Disabling
ACPI is not acceptable since other issues arise.

We found:

/sys/class/drm/card0-DVI-D-1/enabled=disabled
/sys/class/drm/card0-DVI-D-1/status=connected
/sys/class/drm/card0-LVDS-1/enabled=disabled
/sys/class/drm/card0-LVDS-1/status=connected

We used "video=DVI-D-1:1920x1080D video=LVDS-1:1920x1080e" (both independently
and together) but there was no improvement despite:

[drm] forcing DVI-D-1 connector ON

/sys/class/drm/card0-DVI-D-1/dpms=On
/sys/class/drm/card0-DVI-D-1/edid=<... Samsung EDID block ...>
/sys/class/drm/card0-DVI-D-1/enabled=enabled
/sys/class/drm/card0-DVI-D-1/modes=1920x1080
1920x1080
1920x1080
1920x1080
1920x1080
1920x1080
1920x1080
1920x1080
1680x1050
1600x900
1280x1024
1280x1024
1440x900
1366x768
1280x800
1152x864
1280x720
1280x720
1280x720
1024x768
1024x768
1024x768
832x624
800x600
800x600
800x600
720x576
720x480
720x480
640x480
640x480
640x480
640x480
640x480
720x400
/sys/class/drm/card0-DVI-D-1/status=connected
/sys/class/drm/card0-DVI-D-1/uevent=
/sys/class/drm/card0-LVDS-1/dpms=On
/sys/class/drm/card0-LVDS-1/edid=
/sys/class/drm/card0-LVDS-1/enabled=enabled
/sys/class/drm/card0-LVDS-1/modes=800x600
/sys/class/drm/card0-LVDS-1/status=connected
/sys/class/drm/card0-LVDS-1/uevent=

We also tried "vbetool dpms off".


[1] http://support.elmark.com.pl/advantech/pdf/DSA-3020man.pdf

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