[EMAIL PROTECTED] wrote: > Thanks for the reply, Matthew. > > On Mon, 5 Sep 2005, Matthew Garrett wrote: > >> [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: >>> I am trying to get intelfb running on a system with a 855GM onboard >>> chip, >>> and the driver exits at intelfbdrv.c::intelfb_pci_register() (2.6.13, >>> line >>> 814: >>> >>> if (FIXED_MODE(dinfo) && ORIG_VIDEO_ISVGA != VIDEO_TYPE_VLFB) { >>> ERR_MSG("Video mode must be programmed at boot time.\n"); >>> cleanup(dinfo); >>> return -ENODEV; >>> } >> >> This ought to be done by the bootloader if you pass a vga=foo argument. >> The framebuffer driver doesn't know how to switch resolutions (primarily >> because Intel won't tell anyone how to do it, so the only method is a >> real-mode BIOS call to the VESA BIOS) > > Do I get it right, that, say, if I tell grub to load a kernel and > specify "vga=xxx" on the kernel command line, grub will interpret it, > issue some VESA BIOS calls and fill in the screen_info struct? If so, > the card often supports several modes (VGA, SVGA, VESA, different > resolutions, colour depths, etc.), right? So, which one will be chosen? > Does it depend on the specific value I give to "vga="? How do I force > VIDEO_TYPE_VLFB (VESA VGA in graphic mode) mopde then? > > BTW, I didn't find any code in grub that sets up screen_info, or it's > very well hidden:-)
One good method is to use the "vesa" driver of Xorg/Xfree86. Check /var/log/X*.log and it should have a nice list of vesa mode id's that are supported. Then add 0x200 to any of them and use it in your vga= parameter. Tony - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/