On Tue, Oct 06, 2015 at 01:40:05PM +0100, edward wandasiewicz wrote:
On Tue, Oct 6, 2015 at 2:02 AM, Kevin O'Connor kevin@koconnor.net wrote:
P.S. it should be possible to implement a SeaVGABIOS with support for mode switching on Intel graphics adapters. That should solve these problems (at least on Intel hardware), but it's a bit of work as I find the Intel graphics manuals to be basically indecipherable. :-(
Does this explain why there is only one mode available. Other resolutions could be added, but since there is no support for mode switching, we don't have the ability to change back and forth from any of them, even if we tried.
Right. Also, some boot loaders (and kernels) try to write directly to the legacy framebuffers. With cbvga SeaVGABIOS the gpu isn't actually using these legacy framebuffers. As a result the video output is not seen and it looks like a crash. If SeaVGABIOS could instruct the gpu to change into the legacy modes then the legacy framebuffers would actually be valid.
-Kevin
-
Kevin O'Connor