On Fri, 3 Nov 2000, Zack Weinberg wrote: > I've just upgraded to XFree86 4.0.1 (thanks for the packages, > Branden!) and have encountered a bug in video mode detection with the > Mach64 drivers.
> Consider this XF86Config fragment: > Section "Monitor" > Identifier "ViewSonic E771" > HorizSync 30-70 > VertRefresh 50-120 > Modeline "1024x768" 94.685 1024 1072 1168 1376 768 769 772 808 > Modeline "1152x864" 108.079 1152 1216 1344 1600 864 865 868 900 > EndSection > Section "Screen" > Device "ATI 3D Rage IIC" > Monitor "ViewSonic E771" > DefaultDepth 24 > Subsection "Display" > Depth 24 > Modes "1024x768" "1152x864" > EndSubsection > EndSection > The mode lines are precisely as the DDC driver in X4 probed them; so > are the horizontal and vertical rates. (Incidentally, why must I > specify HorizSync and VertRefresh in X4 when DDC can probe them > itself?) > When this setup is used with XF86_Mach64 from 3.3.6, it reports > (--) Mach64: Card type: AGP > (--) Mach64: Memory type: SDRAM (4) > (--) Mach64: Clock type: Internal > (--) Mach64: Maximum allowed dot-clock: 230.000 MHz > (**) Mach64: Mode "1024x768": mode clock = 94.685 > (**) Mach64: Mode "1152x864": mode clock = 108.079 > (--) Mach64: Illegal mode according to Mach64 BIOS > (--) Mach64: Removing mode "1152x864" from list of valid modes. > and the server will only operate at 1024x768. When the identical > setup is used with the ati driver in 4.0.1, it does not object to > 1152x864: > (--) ATI(0): Virtual size is 1152x864 (pitch 1152) > (**) ATI(0): Default mode "1024x768": 94.5 MHz, 68.7 kHz, 85.0 Hz > (**) ATI(0): Default mode "1152x864": 108.0 MHz, 67.5 kHz, 75.0 Hz > (--) ATI(0): Display dimensions: (32, 24) cm > (--) ATI(0): DPI set to (91, 91) > But in that mode the right hand two-thirds of the screen is mangled. > It appears as if the image has been duplicated, shifted right about a > hundred pixels, distorted, and overlaid on the original. With massive > flicker. xvidtune cannot help. > If I reduce the depth to 16, then both 3.3.6 and 4.0.1 accept 1152x864 > and display it correctly. What about -depth 24 -fbbpp 24? If that works fine, then fbbpp 32 (the default) at 108MHz is simply asking too much out of your video memory. Marc. +----------------------------------+-----------------------------------+ | Marc Aurele La France | work: 1-780-492-9310 | | Computing and Network Services | fax: 1-780-492-1729 | | 352 General Services Building | email: [EMAIL PROTECTED] | | University of Alberta +-----------------------------------+ | Edmonton, Alberta | | | T6G 2H1 | Standard disclaimers apply | | CANADA | | +----------------------------------+-----------------------------------+ XFree86 Core Team member. ATI driver and X server internals.
