[Bug 97529] New: i915 kms turns display black on Asus T100HA (Intel Atom x5-Z8500)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97529

            Bug ID: 97529
           Summary: i915 kms turns display black on Asus T100HA (Intel
                    Atom x5-Z8500)
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: pan0 at centrum.cz
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 126095
  --> https://bugs.freedesktop.org/attachment.cgi?id=126095&action=edit
dmesg output from drm-intel-nightly 4.8-rc3

Hi,
I have a problem on my Asus T100HA (Intel Atom x5-Z8500, Intel HD Graphics Gen
8-LP) with i915 driver. After modeset (kms) the display turns black until
reboot. The situation is the same when I boot without nomodest or with it and
reload the i915 module with modeset=1. I am using Debian and kernel build from
drm-intel-nightly from last week (commit
30de872fd5cf71a51994375fb4f76856c05b1c4c) – 4.8.0-rc3+, architecture is x86_64.
The dmesg output is attached – it is from boot without nomodeset and with
drm.debug=0x1e parameter.   

There are several timeouts, so I guess there could some problem with some irq.
I`ve tried to find what could be wrong but the code is too unknown for me.
Please let me know if I can provide some more diagnostics, test some patches
etc. I`ll be happy to help to make this work.

Thank you

Pavel

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