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>]

Hi Izumi Tsutsui,

I forgot to mention, but I did run X -configure, edited the xorg.conf.new to have "AccelMethod" "uxa", moved it to /etc/X11/xorg.conf, but it didn't work on NetBSD 9.0.

I also tried with "Accel" "false", but X still hanged.

I tried the oldest NetBSD version still available at ftp.NetBSD.org, which is 7.1.2 (this time on amd64), and X did work out of the box.  It also didn't have any “dmesg | grep intel” errors.

When I upgraded to NetBSD 7.2 (also amd64), X didn't work out of the box, neither worked after modifying xorg.conf.  It also didn't have any errors show when running “dmesg | grep intel”.

So I think something happened between 7.1.2 and 7.2.

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From: Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>
Sent: Thursday, April 23, 2020 4:00:03 PM
To: kern-bug-people%netbsd.org@localhost <kern-bug-people%netbsd.org@localhost>; gnats-admin%netbsd.org@localhost <gnats-admin%netbsd.org@localhost>; netbsd-bugs%netbsd.org@localhost <netbsd-bugs%netbsd.org@localhost>; joaopaulo1511%hotmail.com@localhost <joaopaulo1511%hotmail.com@localhost>
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

 

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

From: Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: tsutsui%ceres.dti.ne.jp@localhost
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: Fri, 24 Apr 2020 04:58:13 +0900

 Maybe something similar as PR/54995 on Atom N455?
  https://gnats.netbsd.org/54995
 
 How about adding
 > option "AccelMethod" "uxa"
 in /etc/X11/xorg.conf ?
 
 If SNA accelaration is problematic on old Intel chips,
 maybe we should fallback to UXA on such pre-2010 chipset?
 
 ---
 Izumi Tsutsui