[radeon] can't do dual-link tmds, or second tmds transmitter

[Jeremiah Poling]

I cannot get this working. it works over the vga connector, but not DVI.

The Monitor is a Sony SDM-P232W

The fglrx driver will run this display over the DVI connector.

I will attach the xorg.log and my xorg.conf

[Jeremiah Poling (jeremiah)]

Created an attachment (id=5427)
xorg logfile

[Jeremiah Poling (jeremiah)]

Created an attachment (id=5428)
My Xorg Conf

[Barry deFreese (bddebian)]

Do other things work on DVI? I.E., could it be a cable/hardware issue? Thank you.

[Jeremiah Poling (jeremiah)]

I'm pretty sure that it's not a cable issue. if I use the fglrx driver it works.
I prefer to use the open source drivers though.

I'm not a developer, so take this with a grain of salt, but I think that the problem might be related to the reduced blanking interval required for the resolution of this display.

see here for possibly related info: http://suif.stanford.edu/~csapuntz/rv280-linux-dvi.html

I have a dual-link DVI cable, but I honestly have no idea whether this video card supports dual-link.
if it doesn't, then it should use the alternate timings or something, since it works with the fglrx driver.

I'm happy to help any way I can, just let me know what you want me to do.

[Alex Muntada (alex.muntada)]

Your Xorg.0.log shows a different error from the one I reported in bug 37675 (DVI issues). In my case, the DVI input works without problems if I boot MacOSX, so it doesn't seem a hardware problem.

Hope that helps.

[Jeremiah Poling (jeremiah)]

just in case someone finds this helpful, here's My Xorg log when I boot using the fglrx driver.

this is the configuration in which the DVI works.

[Jeremiah Poling (jeremiah)]

this looks like the same (or at the very least related) bug:
https://bugs.freedesktop.org/show_bug.cgi?id=2859

also, using the driver here:
http://cipherfunk.org/diary/archives/monthly/2006-06.html#e2006-06-16T02_13_30.htm
at least gives me a picture over the DVI..
however, with that driver, even though I have an image I now have the "flickering" and "tearing" problems mentioned in the freedesktop bugzilla.

I'm probably going to try and get the latest cvs and see if it helps, but I've never done this before, so wish me luck.

[Jeremiah Poling (jeremiah)]

looks like the latest revision (1:6.6.1-0ubuntu1) give me the same functionality as the cipherfunk version (picture over dvi, but flickers to the point of unusability)

[Greg Wilkins (gregw-mortbay)]

This may be related to https://launchpad.net/distros/ubuntu/+source/xserver-xorg-video-ati/+bug/67183

[Alex Muntada (alex.muntada)]

Will check my external LCD screen with DVI.

[Alex Muntada (alex.muntada)]

Still getting problems with DVI on latest Dapper updates, which seem related to some weird video BIOS errors.

Next week I'm going to upgrade to Edgy and report back.

Jeremiah, did you try it on Edgy?

[Jeremiah Poling (jeremiah)]

Alex:
I believe that edgy picked up whatever patches cipherfunk had pulled into his version.
I get the same results. I have a picture over the DVI now, but it flickers pretty badly.
The flickering is tied to screen updates. If I'm looking at a static desktop and I don't move the mouse, the screen appears fairly stable (still flickering, but only ~ once per second). if I "wiggle" the mouse, it flickers faster, and if I drag windows around, I get heavy flickering and "tearing"..

[Guy Gur-Ari (guygurari)]

This happens to me as well. I'm running Edgy on a thinkpad laptop with a Radeon 9600-based card. Using the 'radeon' driver, external VGA works fine, but DVI doesn't work. When using fglrx, everything works fine.

Another thing that may be related:
    cat /proc/acpi/ibm/video
shows "dvi: disabled" when using radeon, and "dvi: enabled" when using fglrx. This cannot be changed (in either case) by doing:
    echo dvi_enable/disable > /proc/acpi/ibm/video

[Bryce Harrington (bryce)]

Could someone check and report if this is still an issue on Feisty or (if possible) Gutsy? A Live CD ISO can be downloaded here: http://cdimage.ubuntu.com/releases/gutsy/

[Alex Muntada (alex.muntada)]

I'll give it a try this evening (GMT+2).

[Alex Muntada (alex.muntada)]

Now it works for me on Feisty Live CD, as reported in bug #29365:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/29365/comments/9

However, I cannot tell for sure that this bug is fixed (though I think it could be). Jeremiah, could you try it, please?

[Jeremiah Poling (jeremiah)]

Sorry guys, I've built a new system in the meantime. gave the one with the ati to my parents. and they use an old CRT, so no DVI.
I might try lugging my monitor and a liveCD over there this weekend to test, but don't hold your breath.

[Timo Aaltonen (tjaalton)]

Ok, I'll close this bug in the meantime. Reopen if you get a chance to test the old hardware and still see this issue.