RE: kern/55198: When the video card is Intel Mobile 965GM Express, i915drmkms has error CPU pipe A FIFO underrun, also X freezes/hangs

[João Paulo Vinha Bittar <joaopaulo1511%hotmail.com@localhost>]

The following reply was made to PR kern/55198; it has been noted by GNATS.

From: =?iso-8859-1?Q?Jo=E3o_Paulo_Vinha_Bittar?= <joaopaulo1511%hotmail.com@localhost>
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Cc: 
Subject: RE: kern/55198: When the video card is Intel Mobile 965GM Express,
	 i915drmkms has error CPU pipe A FIFO underrun, also X freezes/hangs
Date: Tue, 28 Apr 2020 21:01:45 +0000

 Hi Izumi Tsutsui,=0A=
 =0A=
 I could make X work after I added the "AccelMethod" "uxa" line to both of t=
 he two sections created on xorg.conf.new by X -configure (It didn't occurre=
 d me earlier to do that, sorry).=0A=
 =0A=
 So I think the easiest fix would make "uxa" the default acceleration method=
  on old chips as Intel 965GM.=0A=
 =0A=
 Could you please in the meantime add a suggestion to fix this error on "htt=
 p://netbsd.org/docs/guide/en/chap-x.html#chap-x-configuration" page?  I thi=
 nk the following text could be helpful to add right after the line "If the =
 above test was successful, move the file into place as /etc/X11/xorg.conf a=
 nd you are ready to go":=0A=
 =0A=
 "If the test was not successful and your graphics card is an old Intel mode=
 l, edit /etc/X11/xorg.conf, find all lines where "AccelMethod" is commented=
  with a starting "#", remove the "#" on the beginning and add "uxa" in the =
 end, so the lines will look like: "AccelMethod" "uxa".  It is needed to fin=
 d all lines because some computers have two video outputs."=0A=
 =0A=
 But I have to point out this "uxa fix" only helps with X, it doesn't make t=
 he error boot messages go away.=0A=
 =0A=
 Thank you very much,=0A=
 =0A=
 Jo=E3o Paulo Vinha Bittar=