[Bug 93483] New: Black screen when switching to VT with CTRL ALT F1 on Ivybridge and Broadwell kernel 4.4-rc1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93483

            Bug ID: 93483
           Summary: Black screen when switching to VT with CTRL ALT F1 on
                    Ivybridge and Broadwell kernel 4.4-rc1
           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: tasev.stefanoska at skynet.be
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Tasev Nikola 2015-12-22 19:45:33 UTC

Hi 

I only noticed this yesterday, but starting from kernel 4.4-rc1 to 4.4-rc6
switching to VT with CTRL ALT F1 will result with a black screen (nothing
displayed on it) on my both ivybridge and broadwell Asus UX31A UX305FA.
Login in and typing something in the dark (sudo reboot) is working.

Bisecting gives:

f4502c25ebd04691f284fdafff4a5613299c36dc is the first bad commit
commit f4502c25ebd04691f284fdafff4a5613299c36dc
Author: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Date:   Thu Aug 27 15:44:04 2015 +0200

    drm/i915: Always try to inherit the initial fb.

    The initial state is read out correctly and the state is atomic,
    so it's safe to preserve the fb without any hacks if it's suitable.

    Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
    Reviewed-by: Jesse Barnes <jbarnes at virtuousgeek.org>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

After some research i found the commit on 

http://www.spinics.net/lists/intel-gfx/msg72159.html

diff --git a/drivers/gpu/drm/i915/intel_fbdev.c
b/drivers/gpu/drm/i915/intel_fbdev.c
index 7eff33ff84f6..914679ceb200 100644
--- a/drivers/gpu/drm/i915/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/intel_fbdev.c
@@ -578,9 +578,6 @@ static bool intel_fbdev_init_bios(struct drm_device *dev,
     struct intel_crtc *intel_crtc;
     unsigned int max_size = 0;

-    if (!i915.fastboot)
-        return false;
-
     /* Find the largest fb */
     for_each_crtc(dev, crtc) {
         struct drm_i915_gem_object *obj =


Reverting the commit fix the issue on both laptop's.

Setting i915.fastboot=0 in grub doesn't help

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