[Bug 94338] New: Kernel DRM/i915 init sends eDP panel into self-test loop

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94338

            Bug ID: 94338
           Summary: Kernel DRM/i915 init sends eDP panel into self-test
                    loop
           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: infernix at infernix.net
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 122029
  --> https://bugs.freedesktop.org/attachment.cgi?id=122029&action=edit
dmesg

On a Skylake i3-6100T (HP ProOne 400 G2 All-in-One) and todays' linus master
and drm-intel-nightly, the display enters a self-test mode immediately after
booting the kernel, presumably when i915/drm driver gets loaded. It goes into a
full-screen cycle of 2 seconds red, then green, then blue, and loops
infinitely.

Xorg reports it gets initialised, but stays in 1024x768 whereas the panel is
native 1600x900. It boots fine from EFI and grub has no issues displaying
graphics. The panel can be toggled off and on with xrandr but the self-test
remains active.

On 4.3 kernels the panel goes black instead of the red/green/blue self test
cycle.

On 3.16 the panel works in VESA framebuffer mode without issue, in 1024x768.

System info:
- x86_64, 4.5.0-rc5+ with both linus master
(29a9faa641857425af76e44f2fab22db53032401) and drm-intel-nightly
(e511a05b4b3bb4d1dbca99b00af6d0dc0a65d295)
- Debian Jessie (tried 3.16 kernel as well as jessie-backports 4.3 kernel
before using upstream)
- HP ProOne 400 G2 20-in Touch AiO
- eDP connector for built-in panel


Tried with no effect: http://paste.debian.net/410285/

Relevant data attached.

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