From: <wil...@al...> - 2002-08-28 13:02:47
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Hi, I have a SBC with a MediaGX graphics card. I run Redhat 6.2 on it. My application is written using Qt embedded. I can select modes from the fb.modes file (Mach64 ATI). I want to drive an LCD display and need to change the resolution to 480x234. How to I calculate (tune) the timings for that resolution? When I try to change the geometry to anything different than standard video modes I get the following error: Cannot Support Requested CRTMode 480x234 8 (39722, 60), 3 ioctl FBIOPUT_VSCREENINFO: Invalid argument. This is an example from the fb.modes file: # 640x480, 60 Hz, Non-Interlaced (25.175 MHz dotclock) # # Horizontal Vertical # Resolution 640 480 # Scan Frequency 31.469 kHz 59.94 Hz # Sync Width 3.813 us 0.064 ms # 12 chars 2 lines # Front Porch 0.636 us 0.318 ms # 2 chars 10 lines # Back Porch 1.907 us 1.048 ms # 6 chars 33 lines # Active Time 25.422 us 15.253 ms # 80 chars 480 lines # Blank Time 6.356 us 1.430 ms # 20 chars 45 lines # Polarity negative negative # mode "640x480-60" # D: 25.175 MHz, H: 31.469 kHz, V: 59.94 Hz geometry 640 480 640 480 8 timings 39722 48 16 33 10 96 2 endmode Thank you for your help. Wilhelm Leichtfried wil...@al... |