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- From: keane@brunel.rutgers.edu (John Keane)
- Newsgroups: comp.os.linux
- Subject: Help with X and PVGA1 chipset in 1024x768 interlace mode
- Keywords: X, PVGA1, interlace
- Message-ID: <Aug.25.17.40.26.1992.12769@brunel.rutgers.edu>
- Date: 25 Aug 92 21:40:28 GMT
- Organization: Rutgers Univ., New Brunswick, N.J.
- Lines: 34
-
-
- I have successfully installed X386 on top of the MCC-0.96c interim
- release of Linux. The machine I'm using is a PC-Brand 486/33, which
- comes with the Paradise chipset (PVGA1) and 1M of video memory
- on-board. I have managed to get X going at 640x480, 800x600, and
- 900xSomething, all non-interlaced.
-
-
- Here's my problem:
-
- I can't seem to get any interlaced modes working. I *know* the card
- will display a very nice 1024x768i, because I have Windows at that
- resolution. No matter what I do with the clocks and timings, I can't
- seem to get a stable interlaced image at any resolution under X386.
- Experiments have resulted in images with no vertical sync, no
- horizontal sync, horizontal sync but jitter in the displayed data, two
- separate overlapping images, and one image with only half the scan
- lines displayed.
-
- The clocks reported by startx are:
-
- 25 28 50 57 68 72 78
-
- My monitor is an OEM multisync, capable of synching 31-38KHz
- horizontal, and 50-90Hz vertical. It purports to have 8514/a
- compatibility (which would probably be fine if I had a 45MHz clock to
- use...)
-
- Does anyone have any idea what I might do to make this work, or even
- any suggestions for where to look for more technical information? I'd
- really like to get this mode working, as it is the best hi-res mode on
- the monitor.
-
- _John_
-