In message <20040703051936.GH1603@wantadilla.lemis.com>, "Greg 'groggy' Lehey" 
writes:
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>On Wednesday, 23 June 2004 at 21:11:11 -0400, Steven M. Bellovin wrote:
>> I'm having trouble configuring X for a new machine.  I've attached my
>> XF86Config and the Xlog output.  The config file is identical to the
>> previous one I had used (with the same monitor), with the exception of
>> the Device section, which I took from the file generated by the
>> -configure option.  The monitor specs can be found at
>> http://docs.us.dell.com/docs/monitors/59119/specs.htm
>>
>> I'm trying to run at 1280x1024, 16 bpp.  Windows XP does it just fine,
>> and the monitor does indeed claim to be running at 91.1 Hz horizontal.
>> But XFree86 insists that it can't find a usable configuration.  I tried
>> adding HorizSync and VertRefresh lines to the Monitor section (not
>> shown below); that didn't help.
>>
>> The log file clearly shows that Mode 49 is 1280x1024x16, so the
>> resolution and depth are supported.  I freely confess I don't
>> understand the rest of the fields for the mode descriptions.
>>
>> I'm running a very up-to-date -current X server.
>
>You don't say what goes wrong, and neither (AFAICT) does the log file,
>but it does point to a problem with the mouse.  What happens when you
>try to start?  Does xf86cfg do anything useful?
>

Sorry -- I should have, of course.  The problem is that X doesn't start 
at all -- it complains that it can't find a video mode to match what 
the BIOS says.  I had a followup posting, and PR 26106, with more 
current data -- it's not a configuration issue; it's some bug or 
deficiency in either the i810 driver in X or in our agp kernel driver.

The latest datum is that XFree86 4.3 is working for me.  I'll be doing 
a lot more analysis tomorrow, and will post details then.

		--Steve Bellovin, http://www.research.att.com/~smb