Provide a minimal implementation of the Linux vga_get/vga_put API and use it

in inteldrm(4).

The Intel integrated graphics device has a major design flaw where it needs
legacy VGA io access to disable VGA mode completely.  This only works if
legacy VGA io routing is setup such that it actually reaches the IGD.  This
typically isn't the case if the primary VGA device is a discrete graphics
device.  To make sure we don't whack that device we have to temporarily
route legacy VGA io access to the IGD.

Fixes the "black screen" issue reported by Timo Myrra and others.

0 files changed, 0 insertions, 0 deletions