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which key sequence to reset graphics card?
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Senior User
Join Date: Oct 1999
Location: Austin, TX 78751
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I read somewhere (and used) a key sequence that will reset the graphics subsystem in a MacBook Pro unibody. This is not to be confused with a PRAM reset or a SMC reset. I think it was also published in a Cnet article, but a Google search reveals nothing.
Does anyone know what this key sequence is?
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Moderator
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Never heard of such a thing. What is it supposed to do and why do you need it?
Steve
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Celebrating 10 years and 4000 posts on MacNN!
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Clinically Insane
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The "M" key would reset the graphics on a PowerMac G5, IIRC.
Never heard of it working on laptops.
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Senior User
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Originally Posted by ibook_steve
Never heard of such a thing. What is it supposed to do and why do you need it?
It exists. I'd just like to try it -- even with a new MacBook Pro (mid-2010) and a new 27" Cinema display, I still experience problems in moving from closed-clamshell mode with an external display to using the built-in display: the internal display remains blacked-out in the worst-case.
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Clinically Insane
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How are you switching displays?
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Senior User
Join Date: Oct 1999
Location: Austin, TX 78751
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Originally Posted by Spheric Harlot
How are you switching displays?
I unplug the mini-DP and USB cables from the MacBook Pro. The display in the MBP comes on temporarily even though the lid remains closed; when it turns off I put the MBP in my backpack.
This works 85-90% of the time, but 10-15% of the time, the MBP doesn't go to sleep properly (i.e. the display remains on).
After all these years, Apple still hasn't perfected the switch between external and internal displays
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Admin Emeritus
Join Date: Oct 1999
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Actually, you're not running into any problems with the display switching. You're running into problems going back to sleep after waking.
For whatever reason, Apple decided that all USB device changes (plugging/unplugging) should force the machine to wake up. So if you put the machine to sleep and THEN unplug USB, the machine wakes up.
So just unplug all the USB stuff before you put it to sleep.
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Senior User
Join Date: Oct 1999
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Originally Posted by tooki
Actually, you're not running into any problems with the display switching. You're running into problems going back to sleep after waking.
For whatever reason, Apple decided that all USB device changes (plugging/unplugging) should force the machine to wake up. So if you put the machine to sleep and THEN unplug USB, the machine wakes up.
So just unplug all the USB stuff before you put it to sleep.
But I'm not putting the machine to sleep and then unplugging USB -- I'm unplugging usb and then waiting for the machine to sleep, which should happen because its lid is closed. But there are also problems (see above) with the internal display actually turning on after the ACD has been disconnected.
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Posting Junkie
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I never heard of this key combo either. Nor the pressing M on a G5 tower. It was never in any of the literature Apple gave me or the literature I found myself. Pretty sure I would have needed it at least once in 4 years of troubleshooting for an AASP.
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I have plenty of more important things to do, if only I could bring myself to do them....
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Senior User
Join Date: Oct 1999
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It's given in an Apple Discussion forum.
Here's it is:
"Force the display to restart Press these keys to force the display to reset:
control-shift-eject
(you may have to press some keys to restart the display after it shuts off)"
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Moderator Emeritus
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All that did was put my display to sleep.
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Senior User
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That's the reset, apparently. Notice the line, "you may have to press some keys to restart the display after it shuts off"
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Professional Poster
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control-shift-eject puts the computer to sleep.
nothing more than that.
it just so happens that when the mac wakes up, the video problems may be cured.
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Senior User
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Originally Posted by amazing
control-shift-eject puts the computer to sleep.
nothing more than that.
it just so happens that when the mac wakes up, the video problems may be cured.
Command-option-eject invokes sleep. Ctrl-shift-eject is different.
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Posting Junkie
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OK, so does it help with your issue?
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I have plenty of more important things to do, if only I could bring myself to do them....
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Professional Poster
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Originally Posted by Le Flaneur
Command-option-eject invokes sleep. Ctrl-shift-eject is different.
Oops, you're completely right! I awoke it too soon, didn't wait long enough for the display to come back up.
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Moderator
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Ctrl-shift-eject works to shut down the display on my iMac, at least. Interesting. wonder if it works on my old iMac G5 as well? That one had problems with an Apple converter from the mini-VGA to something that I used on occasion.
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The new Mac Pro has up to 30 MB of cache inside the processor itself. That's more than the HD in my first Mac. Somehow I'm still running out of space.
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