Reported by MacMan, Aug 29, 2011
There was a code change in ati.c somewhere after r1339 that breaks support for the AMD HD 6670. If the device ID for the card is added to the latest version of ati.c (r1379) you get a white screen using Bulrushes for the frame buffer. If you do the same with ati.c r1339 it works fine,
Comment 1 by Azimutz, Aug 29, 2011
Hi Macman, try using AtiPorts=3. I removed the 3 port limit imposed to all chipsets above Cedar on r1375; maybe that's the problem!? That's all i can think of.
Comment 2 by MacMan, Aug 30, 2011
Using AtiPorts with any number less than 6 solves the problem. I only see the white screen when AtiPorts=6 or when using the frame buffer default of 6. Are we sure 6 ports is correct for Bulrushes? Or is the issue with the card?
Comment 3 by Azimutz, Aug 30, 2011
The info about the framebuffers i've been using comes mostly from bcc9's topic tools/guide: http://www.insanelymac.com/forum/index.php?showtopic=249642 it's based on info collected from real Mac's, so i assume it's correct. Nr of ports seems to be a hardware limitation; the tip for the AtiPorts key comes from this post: http://forum.voodooprojects.org/index.php/topic,1959.msg10402.html#ms g10402
Comment 4 by MacMan, Aug 30, 2011
Thanks, good stuff in bcc9's post. Using his tool I see that Bulrushes is 6 ports. I wonder if the issue is only with the Gigabyte card I have or all 6670's? If it's all then it's easier to work around it.
Comment 5 by Azimutz, Aug 30, 2011
Your welcome. I saw this one coming, backfiring on me :) so i have some stuff half cooked up. Will put it up to my branch soon, for evaluation...
Comment 6 by Azimutz, Aug 31, 2011
Take a look at r1486/87 and see if it makes any sense. Works fine on my tests...
Comment 7 by MacMan, Aug 31, 2011
Makes sense to me. I'll give it a try with using 3 for the 6670 and let you know how it works.
Comment 8 by MacMan, Aug 31, 2011
I built r1488 with a couple of additional cards and tested it with a HD 5770, HD 6670 and a HD 6850 and it worked as expected. Suggested changes for lines 1366 and 1370: 1366 from: verbose("Nr of ports set to framebuffer's default: %d\n", card->ports); to: verbose("Nr of ports set using framebuffer default: %d\n", card->ports); 1370 from: verbose("Nr of ports set to card's ?? max: %d\n", card->ports); To: verbose("Nr of ports set using framebuffer port override: %d\n", card->ports);
Comment 9 by Azimutz, Sep 5, 2011
Hi Macman... sorry for the delay. About the code, i still have my doubts... this all depends on user feedback and... we'll see. About the debug messages, they are not thought as final; will review as i go (if i go); i just don't agree with "override" for this code change, which i consider to be in the "user action" scope. Sure, the code does a similar thing, replacing the key, but it's more a "limit" than an override. Anyway, think you can close the issue; we can talk about this some were else.
Comment 10 by Cosmosis Jones, Sep 5, 2011
Macman you can change the debug lines in your branch. we may merge them later...