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Re: Bullseye installation problem (with Matrox GPU)

Andrew M.A. Cater composed on 2021-07-06 22:30 (UTC):

> On Tue, Jul 06, 2021 at 04:26:52PM -0400, Felix Miata wrote:

>> I do have the MGA driver xserver-xorg-video-mga dysfunctional on (an AGP) G550 in
>> i686 Bullseye by disabling KMS via nomodeset on, and adding iomem=relaxed to, the
>> kernel command line, without installing firmware-misc-nonfree. The dysfunction is
>> the screen blanks momentarily at random times, but is otherwise normal as long as
>> xrandr is not needed to configure the screen. Installing firmware-misc-nonfree
>> doesn't help.

> Good news, then - apparently 5.10 now supports this better with KMS and will
> also support the non-server G200 on Matrox cards

> https://www.phoronix.com/scan.php?page=news_item&px=Linux-5.10-Matrox-G200										
I did a little more experimenting and learned my G550 doesn't need nomodeset for
the MGA X driver to work, but it only produces 1920x1080 on my 2560x1440 screen,
and xrandr still can't identify output names.

# lsmod | egrep 'mga|video'
# xrandr | egrep 'onnect|creen|\*' | grep -v disconn | sort -r
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 400 x 270, current 1920 x 1080, maximum 1920 x 1080
default connected 1920x1080+0+0 0mm x 0mm
   1920x1080     60.00*
# inxi -SGay
  Host: a-865.ij.net Kernel: 5.10.0-7-686 i686 bits: 32 compiler: gcc
  v: 10.2.1
  parameters:...noresume mitigations=auto consoleblank=0 iomem=relaxed
  Desktop: Trinity R14.0.11 tk: Qt 3.5.0 info: kicker wm: Twin 3.0 vt: 3
  dm: startx Distro: Debian GNU/Linux 11 (bullseye)
  Device-1: Matrox Systems Millennium G550 driver: N/A
  alternate: matroxfb_base bus-ID: 01:00.0 chip-ID: 102b:2527 class-ID: 0300
  Display: server: X.Org 1.20.11 driver: loaded: mga
  unloaded: fbdev,modesetting,vesa display-ID: :0 screens: 1
  Screen-1: 0 s-res: 1920x1080 s-dpi: 81 s-size: 602x343mm (23.7x13.5")
  s-diag: 693mm (27.3")
  Monitor-1: default res: 1920x1080 hz: 60
  OpenGL: renderer: llvmpipe (LLVM 11.0.1 128 bits) v: 4.5 Mesa 20.3.4
  compat-v: 3.1 direct render: Yes
# lsmod | egrep -i 'mga|video'
Evolution as taught in public schools is, like religion,
	based on faith, not based on science.

 Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata

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