FireMV 2200 vs CustomEDID

[Csillag Kristof]

Dear All,

It turned out that the new CustomEDID feature does not always work as
expected. After some trial-and-error, I have done some systematic testing.

I have tested my integrated Radeon X1250 chipset and a PCI FireMV 2200
card with version 6.12.3 (with my CustomEDID patch) and the current GIT
master (with Dave's CustomEDID patch), with a CRT monitor (well,
actually with the analog port of an LCD), with a proper LCD monitor and
with a flaky (DDC-broken) LCD monitor, with all possible combinations of
driver version, card, socket and monitor.

(I have access to a FireMV 2400 card too, but currently I don't have the
time to run all these tests on in.)

Here are the test results:

----------------------------------------------------------------------

1. Radeon X1250

1.1.1. Proper LCD on Socket 1 - Port1 - DVI-0 - INTERNAL_LVTM1 - OK
1.1.2. Flaky LCD on Socket 1 - Port1 - DVI-0 - INTERNAL_LVTM1 - OK
1.2.1. CRT on Socket 2 - Port0 - VGA - INTERNAL_KLDSCP_DAC1    - OK

2. FireMV 2200

2.1.1. CRT on Socket 1 - Port0 - DVI-1 - INTERNAL_DAC1    - OK
2.1.2. Proper LCD on Socket 1 - Port0 - DVI-1 - INTERNAL_DVO1 - OK
2.1.3.1. Flaky LCD on Socket 1 - Port0 - DVI-1 - INTERNAL_DVO1 - No picture
2.1.3.2. Flaky LCD on Socket 1 - Port0 - DVI-1 - INTERNAL_DVO1, Proper
LCD connected at X start - OK
2.2.1. CRT on Socket 2 - Port1 - DVI-0 - INTERNAL_DAC2    - No picture
2.2.2. Proper LCD on Socket 2 - Port1 - DVI-0 - INTERNAL_TMDS1 - OK
2.2.3.1. Flaky LCD on Socket 2 - Port1 - DVI-0 - INTERNAL_TMDS1 - No picture
2.2.3.2. Flaky LCD on Socket 2 - Port1 - DVI-0 - INTERNAL_TMDS1, Proper
LCD connected at X start - No picture

Notes:
 - The the versions of the driver behaved identical in all test cases,
    so I have not repeated the results.
 - When working with the Flaky LCD, the CustomEDID option was always
    used, except I state otherwise.)


Findings:

 - The FireMV card fails output analog data to the CRT on one of the
sockets.
   According to X log, everything is set up properly, but still,
   there is no image on the monitor.
   (See Xorg.log.CRT_failure)

 - On the FireMV 2200 PCI card, the CustomEDID options fails the enforce
   the requested video mode: according to the X log, everything is set up
   properly, but still, there is no image on the monitor.
   The same feature works properly with the Radeon X1250 chipset.
   Strangely, I can make CustomEDID work on one of the heads by connecting
   a proper LCD monitor when starting X, and then switching back to the
   flaky one. (This works with one head, but not with the other.)

   So, it seems that despite using CustomEDID, this card is still doing some
   low-level monitor detection, and disables the output when it senses no
   connected device.

   (See Xorg.log.CustomEDID_failure)


Do you have any idea how to solve any of those problems?

Best wishes:

    Kristof

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