Messages in this thread | | | From | "Ulrich Windl" <> | Date | Fri, 15 Mar 1996 08:22:38 +0100 | Subject | Re: console bacground color and blanking |
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On 13 Mar 96 at 21:49, Mika Raento wrote:
> Noticing that the newer kernels support my video card better I switched > from 80x25 to 132x44 as my console text mode. The smaller letters are > a bit harder on the eyes so I wrote a short c prog (I can mail it if > someone wants me to) to change the console background color and used it > to change the color to a more peaceful dark blue. > > To my dismay I noticed that now the console blanking didn't switch to a > black screen anymore, but to a blue screen (serves me right for changing > the bg color by using a ioctl :-). I think it might be a more acceptable > behaviour if blanking the console would change the background to black as > well.
No! Blanking means filling the screen with background color. If you type "clear" in xterm, diod you ever have a black background afterwards (if it was white before, of course)?
> > The blanking is implemented in drivers/char/console.c . I made a small > patch to implement the changing of bg color to black and changing it back > to the one in use when un_blanking. I guess this might count as > unnecessary bloat, but it should add only a little to memory usage as the > kernel size only grew ~100 bytes and the routine only permanently > allocates 3 bytes of memory.
Ok, we must distinguish clearing the screen (for the user) and blanking (for the monitor). I think just filling the video memory with zeros will do the latter job unless you have changed the palette registers (0 ist usually black).
> > Here's my patch (against 1.3.72) for anyone to try out, I'd be very > grateful for any comments/input on the subject. Oh, and you should
I think your patch adds even more graphic dependent stuff to the kernel. Shouldn't be use the blank bit of the VGA to get a dark screen, or maybe switch to vesa_blank by default? It seems most monitors have no problem with a missing vsync.
> #define BLACK_BLANK for example in drivers/char/kd_kern.h for this to > take effect. And I'd more than grateful to here if there already existed > a way to do this. (by no means is patch graceful, it's just a quick > implementation of my concept but should be a working example of what I > had in mind) [...]
------------ Ulrich Windl Klinikum der Universitaet Regensburg Rechenzentrum DV-med Franz-Josef-Strauss-Allee 11 Tel: +49 941 944-5879 D-93053 Regensburg FAX: +49 941 944-5882 Just imagine my mail address were <Ulrich.Windl@rz.uni.r.de>...
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