[Bug 60029] New: Failed modeset causes static or out-of-range error on gen6 -- *ERROR* FDI train 2 fail!

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=60029

          Priority: medium
            Bug ID: 60029
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: Failed modeset causes static or out-of-range error on
                    gen6 -- *ERROR* FDI train 2 fail!
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: blocker
    Classification: Unclassified
                OS: Linux (All)
          Reporter: forest at alittletooquiet.net
          Hardware: x86 (IA32)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 73841
  --> https://bugs.freedesktop.org/attachment.cgi?id=73841&action=edit
dmesg output for drm-intel-nightly 2013-01-29 kernel

I get either an out-of-range error or a colorful static pattern using this
hardware:

http://us.acer.com/ac/en/US/content/model/DT.VFGAA.001

This is regardless of connector, including VGA via DVI adapter.

I suspect this is a factor:

[    2.249615] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x700
[    2.249617] [drm:gen6_fdi_link_train], FDI train 1 done.
[    2.250267] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x0
[    2.250319] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x0
[    2.250371] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x0
[    2.250423] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x0
[    2.250475] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x0
[    2.251023] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x0
[    2.251074] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x0
[    2.251126] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x0
[    2.251178] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x0
[    2.251230] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x0
[    2.251779] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x0
[    2.251831] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x0
[    2.251882] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x0
[    2.251935] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x0
[    2.251987] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x0
[    2.252535] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x0
[    2.252587] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x0
[    2.252639] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x0
[    2.252691] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x0
[    2.252743] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x0
[    2.252794] [drm:gen6_fdi_link_train] *ERROR* FDI train 2 fail!
[    2.252795] [drm:gen6_fdi_link_train], FDI train done.

I'm currently testing with an Ubuntu mainline nightly build:

http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-nightly/2013-01-29-raring/

It appears this has all of the available fixes from Daniel Vetter's
drm-intel-fixes branch.

I will do whatever I can to help debug.

Thanks,
Forest

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