Date: Sat, 29 Nov 1997 00:04:50 +0100 (CET) From: Guenther Kelleter Subject: RE: L68K: 2.0.29, Falcon+SM124 In-Reply-To: X-Sender: guenther@pc7390.dialup.rwth-aachen.de To: Art Twarecki Cc: Linux68k-ML X-Mime-Autoconverted: from QUOTED-PRINTABLE to 8bit by www.phil.uni-sb.de id AAA10930 Sender: owner-linux-m68k@phil.uni-sb.de X-Mime-Autoconverted: from 8bit to quoted-printable by faui45.informatik.uni-erlangen.de id AAA23294 On Wed, 26 Nov 1997, Art Twarecki wrote: > On Mon, 24 Nov 1997, Michael Schmitz wrote: > > > >I sent this off a week ago, but never saw it on the list, so here's my > > >question again: > > > > Saw it (on the list or the newsgroup) but waited for a more competent person > > to answer. > > I must have missed it :(. > > > >I find myself in need of specifying the video=keep option, otherwise > > >immediately upon kernel startup, the SM124 screen goes blank. Any clues? > > > > What kernel version, and with what version first observed (what used before)? > > 2.0.29 (it's in the subject field). My VGA migrated to be used with an > Alpha, and I gave up my RGB, so I had no choice but the SM124. This was > recently, so I don't know what the behaviour is with older/newer kernels. > > > I haven't used a SM124 on Falcon in ages so I don't know if that ever was > > different, but you seem to suggest so. My guess is that the Falcon framebuffer > > switches to some default VGA mode regardless of the monitor connected, but > > then, I haven't looked at atafb.c for a long time so I don't know if the > > monitor type should be detected (I'd guess so, but ...). > > There is stuff in atafb.c for handling the monochrome mode. I guess it > just doesn't work well, or perhaps the problem is only on the falcon. > I'll investigate once I have more time... > > > Try video=sthigh for a change? > > Thanks for the suggestion! I'll give it a try. Please try this fix, it avoids reprogramming the video controller if an SM124 is attached. Itīs untested since I donīt have an SM124. The diff is for 2.1.64, but should also apply to 2.0.29+. diff -urp -X exclude-linux -x exclude-linux m68k-2.1.64/drivers/video/atafb.c m68k-2.1.64.compile/drivers/video/atafb.c --- m68k-2.1.64/drivers/video/atafb.c Sun Nov 23 13:34:50 1997 +++ m68k-2.1.64.compile/drivers/video/atafb.c Fri Nov 28 23:41:53 1997 @@ -1556,8 +1550,10 @@ static void falcon_set_par( struct atari if (current_par.screen_base != par->screen_base) fbhw->set_screen_base(par->screen_base); - /* Don't touch any other registers if we keep the default resolution */ - if (DontCalcRes) + /* Don't touch any other registers if we keep the default resolution + * or SM124 Monitor is used (hardware scrolling supported only) + */ + if (mon_type == F_MON_SM || DontCalcRes) return; /* Tell vbl-handler to change video mode. Guenther ----