[Bug 91023] New: [HSW SNA] unwanted "animation" on VT-leave

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91023

            Bug ID: 91023
           Summary: [HSW SNA] unwanted "animation" on VT-leave
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: dh.herrmann at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Hey

If I switch from Xorg to fbcon, I get an unwanted "animation". It takes exactly
4 frames until the new fbcon content is properly displayed. Each frame moves
the content by 25% from the right (and sometimes left) side into the screen. It
really looks like an intended animation that "moves" in the new screen from the
right side.

This only happens if I use the intel DDX with SNA enabled. I neither happens
with UXA nor modesetting+glamour. In fact, I can only reproduce it with SNA.

I've been experiencing this for quite a while (~1 year?), but it looked really
intentional, so I wasn't aware this is not a feature. Until today, as I tried
asking how to disable it and no-one knew what I was talking about..

I don't mind much, I mean it really looks rather nice. But maybe you guys care.
It's an HSW machine (Lenovo X240), and the only noticeable log message is this:

Jun 18 20:12:15 david-t2 kernel: [drm:intel_set_cpu_fifo_underrun_reporting
[i915]] *ERROR* uncleared fifo underrun on pipe A
Jun 18 20:12:15 david-t2 kernel: [drm:intel_cpu_fifo_underrun_irq_handler
[i915]] *ERROR* CPU pipe A FIFO underrun

(which happens exactly once at boot).

I can run this with drm.debug=foobar if you want. Just let me know what kind of
information you need.

Thanks!



gen: 7
pch: 3
is_mobile: yes
is_i85x: no
is_i915g: no
is_i945gm: no
is_g33: no
need_gfx_hws: yes
is_g4x: no
is_pineview: no
is_broadwater: no
is_crestline: no
is_ivybridge: no
is_valleyview: no
is_haswell: yes
is_skylake: no
is_preliminary: no
has_fbc: yes
has_pipe_cxsr: no
has_hotplug: yes
cursor_needs_physical: no
has_overlay: no
overlay_needs_physical: no
supports_tv: no
has_llc: yes
has_ddi: yes
has_fpga_dbg: yes

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