[Bug 92484] New: Can only go to console (fbcon/fbdev) once. Screen gets blank on console mode on next attempts.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92484

            Bug ID: 92484
           Summary: Can only go to console (fbcon/fbdev) once. Screen gets
                    blank on console mode on next attempts.
           Product: DRI
           Version: DRI git
          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: rodrigo.vivi at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

-- system architecture: x86_64
-- kernel version: 4.3.0-rc5+ #12 SMP Thu Oct 15's drm-intel-nightly
-- Linux distribution: Fedora
-- Machine or mother board model: BDW
-- Display connector: eDP

-- Regression: Yes. Bisect points to 

bb1e52402b2a288b09ae37e8182599931c7e9df is the first bad commit
ommit bbb1e52402b2a288b09ae37e8182599931c7e9df
uthor: Rob Clark <robdclark at gmail.com>
ate:   Tue Aug 25 15:35:58 2015 -0400

   drm/fb-helper: atomic restore_fbdev_mode()..


-- Steps to reproduce:
1. Boot to X
2. Alternate first time to fbcon (Ctrl+Alt+F2)
3. Get back to X (Ctrl+Alt+F1)
4. Alternate second time to fbcon (Ctrl+Alt+F2)
...

Only the first time you go to fbcon you can actually get the console. After
that you only get a blank screen.

-- Comments on dmesg:
My dmesg is full of custom printks..

at 30 sec it is the first time going to fbcon where everything works... On the
second one at 53s it seems fb_helper->fb is corrupted.

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