[Bug 91393] [bdw edp] Screen Flickering

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91393

flux242 <flux242 at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      i915 features|display/Other               |

--- Comment #43 from flux242 <flux242 at gmail.com> ---
hi, I'm also experiencing bad flickering of my laptop screen.
I have installed xubuntu 15.10 on Acer C740:

a at chrome:~$ sudo lshw -c video
  *-display               
       description: VGA compatible controller
       product: Broadwell-U Integrated Graphics
       vendor: Intel Corporation
       physical id: 2
       bus info: pci at 0000:00:02.0
       version: 08
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:43 memory:e0000000-e0ffffff memory:d0000000-dfffffff
ioport:1800(size=64)

a at chrome:~$ uname -a
Linux chrome 4.2.0-19-generic #23-Ubuntu SMP Wed Nov 11 11:39:30 UTC 2015
x86_64 x86_64 x86_64 GNU/Linux

But today display was blanked after 15 minutes of inactivity and when I woken
it up I saw no more flickering and this kernel message:
Dec  5 10:16:48 chrome kernel: [ 3708.390613] [drm:intel_dp_start_link_train
[i915]] *ERROR* failed to enable link training

please suggest a way (usingn a kernel parameter) to disable link training until
a bugfix is backported

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