[Bug 90804] New: System "forgets" about its DVI output

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90804

            Bug ID: 90804
           Summary: System "forgets" about its DVI output
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: steve at sk2.org
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 116214
  --> https://bugs.freedesktop.org/attachment.cgi?id=116214&action=edit
Xorg.log

Hi,

My system regularly forgets about the screen connected to its DVI output, with
slightly varying symptoms. This used to happen irregularly, but since upgrading
to 1.17.1 (as packaged in Debian, 2:1.17.1-2) it's systematic. Even with no
power manager (I uninstalled xfce4-power-manager) and no screensaver, the
screen ends up going into powersave mode and X never comes back. Sometimes
switching to a text VT brings the screen back, and then restarting X works; but
often switching to another VT doesn't change anything, nor does restarting X;
only rebooting helps then.

I'm attaching Xorg.log, the kernel log, and working and failed watermarks and
register dumps. The latter reveals that the DVI output is just gone as far as
the system is concerned... I've tried disconnecting and reconnecting the DVI
cable, and that doesn't help either.

I've noticed lots of traces like

Jun  1 21:03:54 heffalump kernel: [52160.398608] [drm:drm_edid_block_valid]
*ERROR* EDID checksum is invalid, remainder is 215
Jun  1 21:03:54 heffalump kernel: [52160.398611] Raw EDID:
Jun  1 21:03:54 heffalump kernel: [52160.398612]        00 ff ff ff ff ff ff 00
22 f0 f7 26 01 01 01 01
Jun  1 21:03:54 heffalump kernel: [52160.398613]        25 12 01 03 80 36 23 78
ee ce 50 a3 54 4c 99 26
Jun  1 21:03:54 heffalump kernel: [52160.398614]        0f 5f ff ff ff ff ff ff
ff ff ff ff ff ff ff ff
Jun  1 21:03:54 heffalump kernel: [52160.398615]        ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff
Jun  1 21:03:54 heffalump kernel: [52160.398616]        ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff
Jun  1 21:03:54 heffalump kernel: [52160.398617]        ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff
Jun  1 21:03:54 heffalump kernel: [52160.398618]        ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff
Jun  1 21:03:54 heffalump kernel: [52160.398619]        ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff

with varying values; I don't know if that's relevant at all.

Regards,

Stephen

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