Xorg with radeon driver and 1600x1200 over DVI

Plaz

Does anybody have Xorg running successfully with the included 'radeon' driver in 1600x1200 mode driving a flat panel monitor over DVI?

I have a Dell 2001FP monitor that was working fine with the correspondnig XFree86 driver, but the Xorg version seems to use different timings which cause the monitor to lose sync and try to enter some strange mode (1408x1200) that involves lots of snow.

I've tried searching for various ModeLine overrides, but haven't gotten very far. Everything works fine in lower resolutions, but the image quality isn't as nice since they're not the native display resolution.

If anybody has this combination working in either Xorg or XFree, can you post your configs and/or logs?

Here are some relevant portions of my xorg.conf:

tightcode · Tux's lil' helper Joined: 23 Mar 2004 Posts: 110

First thing I notice is that I believe your syncs are off... Try it with 31-80

My monitor block:

JDHarris · n00b Joined: 24 Oct 2004 Posts: 45

I have xorg 6.8 working on my Radeon 9000 Pro with dual monitors (Sony CPD-G420's). I can post the xorg.conf file if you like, but the problem you're having sounds like you don't have the correct settings for your display (vert and horizontal refresh rates) in your xorg.conf file. Just post a response here if you'd like me to post my config.
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Plaz · Posted: Wed Oct 27, 2004 4:03 am Post subject:

Thanks for the pointers. I'm pretty sure I tried a variety of legal HorizSync options, but I will try again tomorrow using tightcode's Monitor section when I'm back at the office.

I *did* try to use it without the IgnoreEDID option and without the HorizSync and VertRefresh overrides, and it exhibited exactly the same behavior using whatever it's getting over the DDC interface.

Today I verified that switching back to XFree86 makes it work just fine. I thought maybe I'd screwed up the monitor somehow. I took some register dumps using radeontool in XFree and I'll take some new ones tomorrow now that I've got Xorg installed again to see if there are any interesting discrepancies.

Plaz · Posted: Wed Oct 27, 2004 6:17 pm Post subject:

Well, I tried the monitor section from tightcode and it's still broken for 1600x1200 over DVI. I think the driver just isn't configuring the card properly for this mode, but I'm at a loss to debug it.

I did some register dumps using radeontool, and the only register difference between Xorg and Xfree that showed up was on the RADEON_GPIO_CRT2_DDC register (0x300 vs. 0x30000 in case anybody knows that that means). I'll try to hack something to make it match, but I'm guessing that the problem is with something that isn't going to be visible via radeontool.

It turns out that the problem is ONLY with the DVI interface. If I use the analog connector instead, it seems to display fine in 1600x1200 mode. The problem is that the picture quality isn't nearly as good as with DVI, so I'd really like to get it working again.

Plaz · Posted: Wed Oct 27, 2004 6:37 pm Post subject:

It's actually stranger than I thought. The only way I can get 1600x1200 to work now is to do:

1. Boot system with only DVI connected
2. Start X with DVI connected
3. Switch to VGA connector after X is running

It looks to me like the driver is configuring my Radeon Mobility M9 to use the VGA output after reading the DDC info from the DVI port, but I don't know enough about what goes on internally.

When I tried to boot/startx using only the VGA connector, it decided that it couldn't really drive that high of a resolution and wouldn't go higher than 1280x1024.

Does *anybody* out there have 1600x1200 over DVI using the Xorg 'radeon' driver?