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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Screen Flickering on Intel Card"
href="https://bugs.freedesktop.org/show_bug.cgi?id=95010#c20">Comment # 20</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Screen Flickering on Intel Card"
href="https://bugs.freedesktop.org/show_bug.cgi?id=95010">bug 95010</a>
from <span class="vcard"><a class="email" href="mailto:joakim.tjernlund@infinera.com" title="Joakim Tjernlund <joakim.tjernlund@infinera.com>"> <span class="fn">Joakim Tjernlund</span></a>
</span></b>
<pre>(In reply to Joakim Tjernlund from <a href="show_bug.cgi?id=95010#c19">comment #19</a>)
<span class="quote">> (In reply to Francisco Lopes from <a href="show_bug.cgi?id=95010#c12">comment #12</a>)
> > I'd like to comment that the second issue I mention, in the secondary
> > display, which is an intermittent ON/OFF of the screen, may be possibly
> > unrelated with the screen flicker.
> >
> > While making various tests, I noticed flickering shown up because the
> > secondary display has been connected once, afterwards, anytime I moved my
> > mouse/touchpad, the primary display flickered, hence I thought these two
> > issues could be related.
> >
> > I've applied a flag on boot that worked to remove the flickering, but did
> > nothing about screen ON/OFF, the only solution for this was to downgrade the
> > kernel further.
>
> This intermittent ON/OFF feels like what we (at work) se on our HP ProBook
> laptops(Broadwell) for external monitors.
>
> We use latest 4.4.12 (.13 not tested yet). People here workaround the
> issue by downgrading to 4.1.20.
>
> I am told the i915.enable_rc6=0 does NOT help.
> We also see the
> [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
> underrun
> message</span >
4.4.13 tested now, same ON/OFF problem.
Also, it only happens when having monitors over DP, VGA works fine.</pre>
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