[Bug 86478] [HSW/BDW Bisected] *ERROR* uncleared pch fifo underrun on pch transcoder A & *ERROR* uncleared fifo underrun on pipe B while plugging in VGA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86478

--- Comment #16 from dhead666 <myfoolishgames at gmail.com> ---
Created attachment 112692
  --> https://bugs.freedesktop.org/attachment.cgi?id=112692&action=edit
20150122_fifo.log

I've noticed the error message "*ERROR* uncleared fifo underrun on pipe A"
since kernel 3.17, not sure what the best way to reproduce, sometimes it will
appear when changing to tty2 and others when the system is stressed (e.g. high
GPU usage by Chromium).

See attached log, noticed that I only needed to change to tty2 for the error
message to appear.

Worth mentioning that I also see regression of xf86-video-intel 2.99.917,
running X on vt1, changing to tty2 and back will make the desktop (Gnome)
unresponsive. Chris Wilson tested this in Ubuntu and didn't saw any problem so
this might be Arch packaging specific, I'm waiting for someone else to confirm
it at https://bugs.archlinux.org/task/43534 .

system: Acer C720, Haswell GT1, 2995U
kernel: 3.19rc5
xf86-video-intel: 2.99.916
mesa: 10.4.2
xorg-server: 1.16.3
distro: Arch Linux x86_64

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