Bert Freudenberg wrote: > On 25.11.2008, at 11:57, Strider wrote: > >> Hi, >> I have a XO Laptop which is a nice machine machine with a high res >> display of 1200x900 pixels. The problem with this is that the laptop >> isn't powerful enugh to handle fullscreen applications at this >> resolution. If only the display could switch to a lower resolution >> things would be much better but it seems that this laptop only >> supports a single resolution. >> >> So I was wondering if it would be possible of simulating lower res >> at a low level, that is the xf86-video-geode driver. >> I'm not an expert in video drivers but i imagine that there are >> functions to request a pixel to be drawn on screen based on what's >> in the video ram. >> Now let's say that it's not one pixel but two that we put on screen, >> and that we draw each lines two times. That would result in a >> 600x450 resolution. >> If we do the same thing but repating the operations three times , we >> would have a 400x300 resolution. >> Some emulators have a scale option to do such a thing and manage it >> quite well, but if we had such an option in the video driver, the >> result would be even faster ! >> >> So what do you think about this? Is it possible ? > > > The Geode actually can do real upscaling (that is, scale multiple > graphics resolutions to the panel resolution), it works fine on other > machines and LCDs. But latest word is that this somehow interacts > badly with our DCON, so no-one has gotten it to work correctly on the > XO yet.
Indeed. I think there is a DCON interaction happening, because the mouse gets "corrupted" during upscaling as well - and that implies that the issue is happening after the screen is constructed. The upscaling works fine on a CRT and on a "standard" TFT panel, so that is what leads me back to the DCON. Its also a long shot that the 1200x900 resolution is confusing the scaler, but I doubt it since the aspect ratio is still 4:3. I would love for other people to try the driver (it is in the latest debxo, I think); perhaps you can see the pattern that I can't. > There still may be hope, because the video upscaler can take RGB 5:6:5 > data, so in theory a lower-res 16 bpp frame buffer could be upscaled > on-the-fly (and the upscaler does 30 fps easily). But I guess getting > this to work would require a very determined X hacker ... The RGB video overlay should just work (TM). So it would take less of a determined X hacker, and more of a determined application hacker to put all the pieces together. Jordan _______________________________________________ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel