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
~/.local/share/xorg/
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.
--
"The wise are known for their understanding, and pleasant
words are persuasive." Proverbs 16:21 (New Living Translation)
Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!
Felix Miata *** http://fm.no-ip.com/
