[Bug 96540] 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

--- Comment #8 from René J.V. Bertin <rjvbertin at gmail.com> ---
Well, that was a painful experience. I installed the 4.6.2 kernel plus the 1.57
firmware (cf. https://bbs.archlinux.org/viewtopic.php?pid=1533863#p1533863),
rebooted. Apart from the illegible text during the initial initrd loading which
4.6.2 didn't change all looked fine until I was about to come report here.

Switching tabs a couple of times my display froze except for the mouse cursor.
I tried the sleep/wake trick, and saw something about the GPU being banned for
some reason on the virtual terminal, and then when back in X11 everything
started to flicker until, apparently, KWin crashed. I coud quit most KDE apps,
but Chrome no longer responded to keystrokes.

I booted back into 4.5.6, and had similar things happen; compositing effect no
longer worked, switching to a virtual terminal and back to X11 gave me a black
screen, and those are just the dysfunctions I remember. It took multiple
reboots and quite a bit of trial and error to get back to where I came from. I
tried one last time with 4.6.2, and again everything was fine until I started
Chrome. This time I just let it start, and at some point KWin crashed and
Chrome again couldn't be quit.

I've put back the firmware files I had before, and kicked 4.6.2 off the system
(even if I know it shouldn't be required).

My next attempt will be to test the UXA acceleration again. Clearly 4.6.2 isn't
ripe yet for my hardware (it seems to run fine on the wife's i3). Normally I
wouldn't mind filing bug reports and testing patches, but not if it's so hard
to get back to a working state.

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