[Bug 96540] New: Celeron N3150 : random display off instants and occasional full-system freezes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96540

            Bug ID: 96540
           Summary: Celeron N3150 : random display off instants and
                    occasional full-system freezes
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: rjvbertin at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 124548
  --> https://bugs.freedesktop.org/attachment.cgi?id=124548&action=edit
lspci -v

I've taken a new notebook into service, a Clevo W510LU with Intel Celeron N3150
(Cherryview/Braswell graphics), 8Gh RAM. Currently I'm running an updated
Kubuntu 14.04.4LTS with

- mainline kernel 4.5.6, home-built
- Ubuntu's LTS-Wily versions of the Xorg (1.17.2) and Mesa (11.0.2), including
the XOrg Intel drivers 2:2.99.917+git20150808-0ubuntu4~trusty2, and libxcb-dri3
1.10-2ubuntu1 .

I have several issues that seem to correspond to what others are reporting:
- at random times the display will turn off while I'm typing, as if I use the
Fn-F2 shortcut which is supposed to do exactly that. Just as with that feature,
a stroke on the touchpad turns the screen back on, nothing else.
- the screen turns off after a period of inactivity, not sure if and how that's
related to the screensaver. Audio-over-hdmi continues when that happens. XDPMS
is off.
- Once or twice the screen turned off and wouldn't come back on, except after
suspending and waking the machine
- From time to time the whole machine freezes. This has only happened until now
when doing a biggish compile job, but the last time it happened it shouldn't
have been related to overheating (fans were barely running).

The difference with what others report is that I get no feedback whatsoever in
my logs or dmesg. I do see an occasional 

[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO
underrun

but I cannot yet confirm if that's related to any of the events mentioned
above.

I'll be trying the UXA suggestion mentioned here:
https://bbs.archlinux.org/viewtopic.php?pid=1533863#p1533863 but if there are
other things I could do other than wait for an updated i915 driver I'd love to
know.

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