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- From: njs@watson.ibm.com (Nick Simicich)
- Subject: Re: X and a Trident8900C
- Summary: I got those Trident monitor card blues.
- Sender: news@watson.ibm.com (NNTP News Poster)
- Message-ID: <1992Nov12.215118.101807@watson.ibm.com>
- Date: Thu, 12 Nov 1992 21:51:18 GMT
- Disclaimer: This posting represents the poster's views, not necessarily those of IBM
- References: <1992Nov12.092417.22968@cs.kuleuven.ac.be>
- Nntp-Posting-Host: hypergly.watson.ibm.com
- Organization: IBM T.J. Watson Research Center
- Lines: 73
-
- In article <1992Nov12.092417.22968@cs.kuleuven.ac.be> henkv@cs.kuleuven.ac.be (Henk Vandecasteele) writes:
- >Hello to everybody,
- >
- >As it seems to be difficult to set up X on a Trident VGA -card I'm posting
- >my Xconfig file.
-
- I believe this to be true as well: It is difficult to set up a Trident
- SVGA card, but I have a theory.
-
- I'm in the process of setting up a Trident as well, and I've gotten X to
- work, well, a little. I've not been successful in getting it to work in
- any of the higher res modes, even though the board seems to have higher
- specs than my CTX monitor.
-
- I've tried a number of different configurations. No matter what I do,
- if I've specified 'chipset "tvga8900"', the monitor just darkens,
- quietly.
-
- Also, If I attempt to do my own clock calculation with a fast on-card
- clock (75 Mz, I know it is way too high) the monitor just darkens
- quietly.
-
- If, however, I don't specify a chipset, I can get X to run. The monitor
- clicks several times during X startup. When X is shutdown, I have to
- reboot to rccover. (No matter what, when I start X, I have to reboot to
- recover. My command for starting X is "sync;startx".) What I think is
- happening is that:
-
- The server is trying each chipset in turn, tvga8900 last because of the
- order that it reports the support.
-
- This is setting funky modes in the card, which is what is causing the
- monitor to clatter. The drivers aren't real careful about restoring the
- modes properly between probes, so something is being set that needs to
- be set.
-
- X runs, but since the driver didn't make all of the changes, it has no
- idea about what to unchange. The reboot fixes it. If I could figure
- out what to do to cause the Trident Bios (version 3) to reset the card,
- (other than rebooting) I would. But the bios is not documented in the
- user's manual, just a bunch of mode numbers for different geometries.
-
- Environment:
- 486/DX 33 Mz, Clone, AMI bios.
- IDE 200M Drive.
- Trident 8900C SVGA card, Trident BIOS 3.00, 1 meg video RAM on card.
- CTX Monitor (60 Mz video bandwidth, max horizontal scan rate 50 Mz,
- Max refresh rate 90 Hz, cute little charts for sync
- timings.)
- SLS from about 3 days ago, recompiled to remove SCSI, math
- emulation, and to select mode 0 automatically on startup.
- All versions of software just as on SLS. Ran mkfontdir in all
- font directories.
-
- When X comes up, it comes up in a mode that looks pretty funky. Using
- Control-Alt-+ or Control-Alt--, I am able to cycle to a lesser mode,
- which works, and looks better. I believe that the higher mode is
- overdriving my monitor's bandwidth. The standard Trident PC/DOS Windows
- drivers for those high resolutions work on my system, but cause a lot of
- flicker, so I suspect that they use conservative bandwidth to pump the
- monitor, and put up with the flicker. Then again, maybe there is no way
- to get those bandwiths out of the card no matter what the specs say.
- You couldn't prove it by me.
-
- Incidentally, I believe that part of the reason that X didn't come up
- for me at one point in my testing was that the Mouse was set up
- incorrectly. The server was hanging on the open of a serial mouse on
- the wrong port, methinks. Specifying the mouse correctly helped.
-
- Please don't get me wrong: I am really impressed with this whole
- system, and also with the SLS installation package.
-
- Nick Simicich
-