[Bug 77660] New: [HD-4400]upsteam kernel (drm-intel-nightly/2014-04-17-trusty) causes blank screen on lenovo X1 Carbon 2014.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77660

          Priority: medium
            Bug ID: 77660
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HD-4400]upsteam kernel
                    (drm-intel-nightly/2014-04-17-trusty) causes blank
                    screen on lenovo X1 Carbon 2014.
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: anewgene+freedesktop at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 97580
  --> https://bugs.freedesktop.org/attachment.cgi?id=97580&action=edit
Xorg.0.log

Bug description:
    This is related to this bug I reported here: 

https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1307623

    I tried the upstream kernel from drm-intel-nightly (2014-04-17-trusty) in
order to investigate the bug above. It actually solved the external monitor
resolution issue, however I had another even more critical issue: my laptop
display turns blank completely. It remains blank even when I boot it without
any external monitor.



System environment:
-- chipset: intel i7-4600U (HD-4400)
-- system architecture: 64-bit
-- kernel: from upstream mainline kernel at
http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-nightly/2014-04-17-trusty/
-- Linux distribution: Ubuntu 14.04
-- xserver: 1.15.1
-- xserver-xorg-video-intel: 2:2.99.910-0ubuntu1 
-- Machine or mobo model: Lenovo X1 Carbon 2014 (20A7CTO1WW)
-- Display connector: DisplayPort

Reproducing steps:
* install upstream kernel from
http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-nightly/2014-04-17-trusty/
* boot with this kernel

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are on the CC list for the bug.
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20140418/21a5ada7/attachment.html>