[Bug 96464] New: Screen update issue (drm/i915/fbc: enable FBC by default on HSW and BDW)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96464

            Bug ID: 96464
           Summary: Screen update issue (drm/i915/fbc: enable FBC by
                    default on HSW and BDW)
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: stevenhoneyman at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 124423
  --> https://bugs.freedesktop.org/attachment.cgi?id=124423&action=edit
dmesg output (fifo|under|i915|intel|drm)

Following advice from Paulo Zanoni
(https://lists.freedesktop.org/archives/intel-gfx/2016-June/098125.html), I'm
submitting this here along with the requested logs.

To summarise:
My screen update speed goes down once or twice per second in a Haswell Dell
E6540, with FBC enabled. It's incredibly noticable when typing and text appears
in chunks. In kernel 4.6.2 moving the mouse while holding a key would hide the
problem, but this does not apply to 4.7.0-rc2.

I'm using Arch Linux as a 'base' distro, but many packages that have compile
time options I'm building myself. Luckily Xorg is not one of them, that's
stock:

$ pacman -Ss xorg|grep -i installed
extra/xf86-input-evdev 2.10.3-1 (xorg-drivers xorg) [installed]
extra/xf86-input-synaptics 1.8.3-2 (xorg-drivers xorg) [installed]
extra/xf86-video-intel 1:2.99.917+654+ga508b11-1 (xorg-drivers xorg)
[installed]
extra/xorg-bdftopcf 1.0.5-1 (xorg xorg-apps) [installed]
extra/xorg-font-util 1.3.1-1 (xorg-fonts xorg) [installed]
extra/xorg-font-utils 7.6-4 [installed]
extra/xorg-fonts-100dpi 1.0.3-2 (xorg) [installed]
extra/xorg-fonts-alias 1.0.3-1 [installed]
extra/xorg-fonts-cyrillic 1.0.3-1 [installed]
extra/xorg-fonts-encodings 1.0.4-4 (xorg-fonts xorg) [installed]
extra/xorg-fonts-misc 1.0.3-4 [installed]
extra/xorg-luit 1.1.1-2 (xorg xorg-apps) [installed]
extra/xorg-mkfontdir 1.0.7-2 (xorg xorg-apps) [installed]
extra/xorg-mkfontscale 1.1.2-1 (xorg-apps xorg) [installed]
extra/xorg-server 1.18.3-2 (xorg) [installed]
extra/xorg-server-common 1.18.3-2 (xorg) [installed]
extra/xorg-server-xvfb 1.18.3-2 (xorg) [installed]
extra/xorg-setxkbmap 1.3.1-1 (xorg-apps xorg) [installed]
extra/xorg-xauth 1.0.9-1 (xorg-apps xorg) [installed]
extra/xorg-xbacklight 1.2.1-1 (xorg-apps xorg) [installed]
extra/xorg-xdpyinfo 1.3.2-1 (xorg-apps xorg) [installed]
extra/xorg-xev 1.2.2-1 (xorg-apps xorg) [installed]
extra/xorg-xfontsel 1.0.5-1 [installed]
extra/xorg-xinit 1.3.4-4 [installed]
extra/xorg-xinput 1.6.2-1 (xorg-apps xorg) [installed]
extra/xorg-xkbcomp 1.3.1-1 (xorg-apps xorg) [installed]
extra/xorg-xmag 1.0.6-1 [installed]
extra/xorg-xmessage 1.0.4-2 [installed]
extra/xorg-xmodmap 1.0.9-1 (xorg-apps xorg) [installed]
extra/xorg-xprop 1.2.2-1 (xorg-apps xorg) [installed]
extra/xorg-xrandr 1.5.0-1 (xorg-apps xorg) [installed]
extra/xorg-xrdb 1.1.0-2 (xorg-apps xorg) [installed]
extra/xorg-xset 1.2.3-1 (xorg-apps xorg) [installed]
extra/xorg-xwininfo 1.1.3-1 (xorg-apps xorg) [installed]

I've attached the output of dmesg|grep -Ei '(fifo|under|i915|intel|drm)'
I'll follow up with the Xorg.0.log (only seem to be able to attach 1 file)

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