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Re: Matrox G550 mga driver hangs system

Felix Miata composed on 2017-03-31 02:22 (UTC-0400):

[xserver-xorg-video-mga is a user-space graphics driver]
If all the above doesn't help, repeat it, but append "iomem=relaxed" to the line
that included video and/or vesa and/or vga...
This showed up on vtty when I did dist-upgrade from jessie to stretch:

apt-listchanges: News
linux-latest (76) unstable; urgency=medium

  * From Linux 4.8, several changes have been made in the kernel
    configuration to 'harden' the system, i.e. to mitigate security bugs.
    Some changes may cause legitimate applications to fail, and can be
    reverted by run-time configuration:
    - On most architectures, the /dev/mem device can no longer be used to
      access devices that also have a kernel driver.  This breaks dosemu
      and some old user-space graphics drivers.  To allow this, set the
      kernel parameter: iomem=relaxed

xorg-server (2:1.17.3-1) unstable; urgency=medium

  The Xorg server is no longer setuid root by default.  This change reduces the
  risk of privilege escalation due to X server bugs, but has some side effects:

  * it relies on logind and libpam-systemd
  * it relies on a kernel video driver (so the userspace component doesn't
    touch the hardware directly)
  * it needs X to run on the virtual console (VT) it was started from
  * it changes the location for storing the Xorg log from /var/log/ to

  On systems where those are not available, the new xserver-xorg-legacy package
  is needed to allow X to run with elevated privileges. See the
  Xwrapper.conf(5) manual page for configuration details.
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