On Tue, May 12, 2009 at 12:47:46PM -0500, Olek Grotowski wrote: > > Niels, > > Thanks again for the reply. I forgot to send my question to the server and > instead it went directly to you, sorry about that. > > Here's a few crazy, possibly eye-rolling questions: > Is DVI sort-of hardwired to CRTC2, hence no accel?
CRTCs don't have anything to do with acceleration as such. The only exception is the video overlay (BES) which is tied to CRTC1 but you can achieve the same things that the BES does (scaling and color space conversion) by using the texture engine. So really the CRTC used should not matter, well unless the application can only do things one way. > If negative, can it be mapped over to CRTC1? I think matroxfb always uses CRTC1 to drive the DVI output. > My G550 is a single VGA/single DVI outputs card. IIRC the VGA output is the > high-performance one. The primary analog output (DAC1) has a higher pixel clock limit than the secondary analog output (DAC2). The panel output has a different pixel clock limit than the analog outputs. Those are the chip's internal outputs BTW, how they map to the physical connectors depends on the board itself. I think on a typical AGP G550 DAC1 and panel outputs go to the DVI-I connector and DAC2 to the VGA connector. But anyways there's no performance difference between the outputs. > Would matroxset, fbset (or outputs:XYZ in grub config file) be of any help > here? No, shouldn't do any difference. > As mentioned before, being a newbie, I am confused by the dfb/matroxfb > terminology. > Thanks in advance for any help. I don't know what software you're using but it may be doing something stupid which kills your performance. Another option is that your MTRRs are not properly set up. I actually have a the MTRR issue on my current system. The BIOS doesn't set up a WC MTRR for the frame buffer and the MTRR layout it uses prevents me from simply adding the WC MTRR myself. Also PAT doesn't seem to be able to do the trick either. Fortunately the CPU (2.4GHz C2D) is fast enough so I don't really notice the problem. My CPU load is ~20% when watching SD stuff. -- Ville Syrjälä syrj...@sci.fi http://www.sci.fi/~syrjala/ _______________________________________________ directfb-users mailing list directfb-users@directfb.org http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-users
