---------- Original message ---------- Subject: Re: Display Resolutions/Freq., MDD, R9000, Leopard Date: Wednesday, 01. August 2012 From: "t...@prismnet.com" <t...@prismnet.com> To: "G-Group" <g3-5-list@googlegroups.com> > Andreas, thank you for the excellently detailed and informative > reply. I won't have a chance to try it out before the weekend, but I > wanted to post my thanks before the thread gets too stale.
You’re welcome! Please report back, if it worked and what worked. I did some testing on my Power Mac G4 Cube, and apperently the boot-args variable stored in NVRAM doesn’t do the trick. It ignores the "Graphics Mode" setting with Mac OS X 10.5.8 Leopard. At least on my Mac. My guess is that it will propably work if you boot in safe mode. This will also clear the boot cashes and recreate them, which may have caused this issue. You can boot in safe mode by holding the Shift key. Other useful keys can be found here: http://support.apple.com/kb/HT1343 Maybe you want to try verbose mode too… If safe mode doesn’t work, try resetting your PRAM (hold Cmd+Opt+P+R right after the chime, until you hear the chime for the third time, then release the keys and start holding the Opt key for the boot selection, then the shift key for safe boot of Leopard). If this doesn’t work either, I’d use the com.apple.Boot.plist method. BUT BE CAREFUL and make a backup first, so you can restore it from your Tiger installation should anything go wrong. Good luck! Andreas aka Mac User #330250 _CORRECTIONS_ > …, even if you enter Open Firmware (by holding > Opt+Alt+O+F). ^^^^^^^^ Should be: Opt+Cmd+O+F 1. Opt (Option key) is on newer keyboards also “Alt” 2. Cmd (Command key) is also the Windows key, should you a PC keyboard… > Do this from you > woring Tiger installation: ^^^^ should read “working”… _ADDITIONS_ > The display is connected via VGA through a DVI to VGA adapter. The adapter is also a possible source for this failure, although very *very* unlikely… > "Graphics Mode"="1280x1024x32@60" You can also try 1280x1024x16@60: The Format is: [x-Resolution in pixels] x [y-Resolution in pixels] x [Color depth in bit] @ [Refresh rate in Hz] Thus, 1280x1024, 32-Bit color (16,7 Billion colors), 60 Hz is 1280x1024x32@60. You can, however, play with different values, like the Color depth. http://en.wikipedia.org/wiki/Color_depth 8-Bit: 256 colors 15/16-Bit: 65536 colors: “High color” 24-Bit: 16,777,216 colors: “True color”—most environments use 32-Bit though, because 1) if fits better in two 16 bit registers and 2) it adds an 8-Bit alpha channel (for transparency). Additionally, you may also choose to try something like 1280x1024x32@75, to set a 75 Hz refresh rate; your monitor should support these well: (CAUTION: but your graphics card may not! Give it a try anyway…) > SXGA: 1280x1024 60, 72 (HP), 75, 76Hz (Sun) 1280x1024x32@60 1280x1024x32@72 1280x1024x32@75 1280x1024x32@76 > 2nd Method: Firmware (NOT WORKING) IF you’re interested, this is how to set boot-args in Open Firmware (by holding Opt+Cmd+O+F right after the chime): The following will show all NVRAM variables: printenv To set the variable boot-args to whatever you want, use: setenv boot-args "Graphics Mode"="1280x1024x32@60" (doesn’t work) setenv boot-args -v -x (will give verbose and safe mode, BUT it is better to hold the Shift key for safe mode and Cmd-V for verbose, should you really need it ONCE. See http://support.apple.com/kb/HT1343 for usable modes.) Then boot Mac OS by typing: mac-boot My resources: If you’re interested more about Open Firmware commands (quite advanced stuff): http://osxbook.com/book/bonus/ancient/whatismacosx/arch_boot.html Or, even more advanced (from Apple, for developers): http://web.archive.org/web/20081226025208/http://developer.apple.com/technotes/tn/tn1061.html http://web.archive.org/web/20081226025213/http://developer.apple.com/technotes/tn/tn1062.html Also of interest, but not very helpful for this specific issue: http://ganswijk.home.xs4all.nl/chipdir/oth/fcode.txt -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
