Re: Weird problem with a G400 - shows only junk through mga_vid

On Sun, Sep 18, 2005 at 11:17:02AM +0200, Attila Kinali wrote:
> On Sat, 27 Aug 2005 22:49:14 +0300
> Mikko Nahkola <[email protected]> wrote:
> 
> > I seem to be having problems with this thing. It just doesn't work 
> > despite claiming to - no errors or even warnings, that is. It's just 
> > that the output is all junk. 
> 
> Ok, first question, where did you get mga_vid from ?
 
:r wget-log
--23:53:16--  http://attila.kinali.ch/mga/mga_vid-2.6.12-2005-06-18.tar.gz
           => `mga_vid-2.6.12-2005-06-18.tar.gz'
Resolving attila.kinali.ch... 147.87.98.10
Connecting to attila.kinali.ch[147.87.98.10]:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 11,364 [application/x-gzip]

    0K .......... .                                          100%  148K       

23:53:16 (147.71 KB/s) - `mga_vid-2.6.12-2005-06-18.tar.gz' saved [11,364/11,364]

> > For example, running mga_vid_test, I get a multicoloured flickering 
> > rectangle (looks like TV static, sort of) instead of green in 1), and it 
> > doesn't change at all going to 2) and 3). Trying to play real video, 
> > similar results. X and text console work just fine, and come back 
> > properly after trying the video thing too.
> 
> Sounds wierd.

That's what I thought too.
 
> > Should the mga_vid_base address be the same as something that lspci 
> > reports? If so, how do I make them be same, they aren't now..? I can't 
> > seem to make the module take any arguments (the Linux 2.4 way doesn't 
> > work anymore or something?)...
> 
> No, it should be just within the memory range of the card that
> lspci reports.

But it _isn't_. I mean, the addresses are the _lower_ boundaries, right?
And lspci reports the starting address for the card as 0xcc00000 (and
kernel log and X server agree with it) but it's being used at 0xb7d47000 
or some such ... and not the same address every time either.

Of course, the PCI bus stuff _can_ move address ranges around but ...?
 
> > Any ideas about where to look next? Disabling udev looks a bit hairy on 
> > Gentoo but what about the console framebuffer layer, should I try with 
> > that enabled? I have tried with and without X running already, that 
> > didn't change anything (there's "VideoRam 8192" in the X config.)
> 
> udev would not cause something like this. I rather supect that
> the wrong memory range got overwritten.

That's what I think too but how do I control which memory range it uses?
 
> What i need from you is:
> 1) mplayer -v log

Attached.

The DVD in this example is an advertising thing about use of wood in interior
decorations, BTW. Audio comes out just fine and the video does work
elsewhere.

> 2) the messages mga_vid writes to klog (see dmesg)

Matrox MGA G200/G400/G450/G550 YUV Video interface v2.01 (c) Aaron
Holtzman & A'rpi
mga_vid: Found MGA G400/G450 at 0000:01:00.0
mga_vid: MMIO at 0xc88f8000 framebuffer: 0xCC000000
mga_vid: OPTION word: 0x50040120  mem: 0x00  SDRAM
mga_vid: detected RAMSIZE is 16 MB
mga_vid: 1 supported cards found
mga_vid: using major: 83 (assigned or default!)

> 3) what mga_vid version you use and where you got it from

See above. And:

$ md5sum mga_vid-2.6.12-2005-06-18.tar.gz
fe69879eecb655b32638a1ba96256a54  mga_vid-2.6.12-2005-06-18.tar.gz

Is this checksum correct?


BTW, I got it to display the right image too - once. With -vo xmga while
rebuilding gcc from source in another window ;-) slight problems getting
enough CPU cycles but ... and mga_vid_test worked right _that_ time too.

So can't reproduce the problem _every_ time (just 9 times out of 10 or
so, this far, with the exact same kernel and the module too.) Isn't that fun?


Oh well. Got a newer system for the wife, guess that one _might_ be
easier to tweak ... it's an IBM Thinkpad with more than a GHz on the
clock, and an ATI Mobility Radeon ... how was the radeon_vid on 2.6.x
kernels again? 



-- 
Mikko Nahkola <[email protected]>

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