Re: 2010 Mac Pro + Yosemite + Radeon 7950

Just been told by Apple Technical Guy (19 December 14) that my ATi Radeon HD 5770 graphics card (bought from Apple!) is no longer supported in Yosemite!!  I can try replacing with an ATi HD 2600XT, return to Mavericks or put up with the inconvenience that my primary screen seems to be the VGA source and each time I log in I get another Desktop Space!  The odd thing is that the HD 2600XT seems to be an older graphics card than my HD 5770?  Not sure what;'s going on?  See details of problem here: https://discussions.apple.com/thread/6618898
Mac Pro (Early 2008), Radeon HD 5770, Yosemite

Hi Hattter!
Definitely nothing wrong with the card as I still have a Mavericks Partition on my system where everything works fine.  Something has happened following the upgrade to Yosemite.  This is how I described the problems to the Apple Tech Guy when I set up a new Yosemite partition ("Yosemite Test") WITHOUT transferring any of my own data files i.e. it's not a software conflict problem:
I still seem to have the same set of problems:
(1) Progress Bar starts on the main screen (DELL 2407WFP), screen goes blank, the Progress Bar completes on the small screen (Panasonic 19” LCD TV) which then asks for the logon credentials;
(2) First time boot from "Yosemite Test", the small screen defaulted to SVGA 800x600 rather than WXGA 1280x768 under Mavericks;
(3) First time boot from "Yosemite Test”, I noticed that in "Preferences / Display / Arrangement" the white "menu bar" was above the small screen ie the small screen seems to have defaulted as the principle screen during Yosemite set up even though the small screen connects to my Mac Pro via the VGA connection on the ATi Radeon HD 5770 GPU and the main screen via the DVi port;
(4) As before 1280x768 isn’t a listed resolution in "Preferences / Display / Scaled" unless I press "alt / Detect Displays / Scaled" when 1280x768 appears and can be set (and stays set through a Restart). NB: the TV screen (rather than the Mac Pro) only reports the correct resolution when I select 60Hz;
(5) As before I’m collecting new desktops each time I Restart - the new desktops showing up in Mission Control above the main screen;
(6) Whilst waiting to logon, the wallpaper shadow behind both main screen and small screen are the same although once logged-on the wallpapers may change - the the wallpaper on the main screen becoming the wallpaper on the small screen, the previous small screen wallpaper becomes an additional desktop in Mission Control at the top of the main screen. Finally the Yosemite default wallpaper (mountain) seems to appear at random on the main screen????
(7) As before, logging out (rather than Restart) and the logon credentials are back on the main screen.
I’m assuming this points to a problem with the Graphics Card Driver rather than a software conflict.  Let me know if you need any more information.
There seems to be numerous reports of graphic problems with Yosemite some of which involve the HD 5770 card.  From your comments, are you suggesting  that there is no driver problem?
Regards
Scubaman31

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    Extremely hard to troubleshoot how this issue is behaving. Like I said, erratic is probably best description.
    This is the worst bug I've personally experienced after an update to an OS since I've been using Macs on System 7.
    I really hope Apple fixes this ASAP.

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