Michael Reinelt a ?crit : > I did some more tests yesterday, and I created lots of test pictures in > 1024x768 and 1280x768 resolution. (Is there a place where I could > provide them to the public?) Send them via private mail, and I'll put them on my web space, along with the other ones. I get 107 page views (not image download) per month on this directory : it must be useful to some. ... > Next I played around with modes for viafb: I get a 1280x768 mode with > this options: > > modprobe viafb mode=1280x768 bpp=32 refresh=60 TVon=0 > > I get a quite good picture where the 1280x768 fit exactly onto the > screen (after some fine-tunig in the TV setup). But as I feared: the > horizontal resolution isn't that good. I get a sharp resolution > vertically, I can see that one pixel on the TV directly corresponds to > one pixel in the test image. Horizontally, the pixels are blurred over > 2-3 pixels. I have to switch the TV into 16:9 mode, in 4:3 mode the > image is scaled down to 1024 pixels. I'm afraid the TV does *always* > scale down to 1024, and then back up to 1280. Who the hell did design > this braindamadged thing??? Well, it is not really astoniching, taking into account the skills or common customers... I think they simply design their 16:9 panels with the same components as the 4:3 ones, and ignore anything that is not obvious. Since VGA as always been 4:3 (until a few years), they stick to it. > Next I tried to play around with 1024x768. Now for the bad news: I > couldn't get a good picture here. First, the only way to get a signal on > the TV is > > modprobe viafb mode=1024x768 bpp=32 refresh=50 TVon=1 TVtype=1 TVoverscan=1 > > (note the TVon=1!!) This places to VGA chip into special refresh rates that fit the TV encoder. These rates work with a multiscan monitor, but not with your TV. There again : cheap design. > As soon as I set TVon to 0, I get "no signal" or "not receiving" on the > TV. Maybe some of the modes in viafb are wrong? Might be, but IMHO the TV is also wrong. > But even with the TVon=1 mode, the resulting image isn't 1024x768, but > somewhat smaller ( I suppose about 800x600 or so). I think here are some > wrong mode values, too. Since the TV encoder fits the image in a PAL frame, and does not do wonderful things, the VGA chip must provide degraded resolution, also shown on the VGA output. > Next I will play with softdevice and try to get VDR on viafb up and running. Try my Debian package (http://nicolas.huillard.net/vdr/debian/ : recompile it) or the one from Tobias Grimm (improved from mine) in alioth.debian.org's SVN repository. Also softdevice and softplay developers prepare a release real soon now (this week-end). > Last questions: is this the right ML for this stuff, or is it a bit OT > here? The original post was slightly OT, and derived to completely OT in many directions... The right ML are softdevice-devel@xxxxxxxxxx and directfb-users@xxxxxxxxxxxx (viafb, DirectFB, TV-out). Start a new thread there. -- NH
