On Mon, 21 Jan 2002, Nils Holland wrote: > I have a short question: I'm using Xfree86 with a ATi Rage Pro card and a > Compaq monitor. Unluckily, this monitor does not support DDC, and now I > have noticed this:
> When I use XFree86 4.1.0, everything works fine using the ati driver. > When I use Xfree86 4.2.0, again with the ati driver, my screen remains > blank, although X starts up successfully. After a little research, I > noticed that adding the line > Option "composite_sync" "false" > to my XF86Config file solves the problem. > The question that arises now is this: Since the monitor doesn't support > DDC, it cannot tell X if composite sync should be used or not. Now, it > seems that the ati driver in 4.1.0 assumed to *not* use composite_sync by > default if a DDC probe fails, while 4.2.0 seems to do the opposite: It > seems to enable composite sync by default if a DDC probe fails. > I'm wondering if there is a specific reason why this has been changed. Any > comments are welcome ;-) I changed the default at the prompting of many people. I discovered that most monitors do support, or at least tolerate, composite sync, whether or not they also support DDC. All my monitors here do, including a panel, an old SVGA-only (800x600) CRT, etc. 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. _______________________________________________ Xpert mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/xpert
