Questions tagged [nvram]

Non-volatile random access memory; RAM that doesn't lose the stored information when the power is turned off, unlike traditional RAM

Filter by
Sorted by
Tagged with
0
votes
1answer
183 views

Bluetooth device still paired after clean install

I'm facing some issue with Bluetooth device(s) still paired to my Mac after a clean install. I'm currently using a 2013 Macbook Pro on Sierra, which was previously used by one of my co-worker for the ...
14
votes
4answers
49k views

Trying to set boot-args with nvram gets “general error” on Sierra

I'm trying to temporarily disable KEX signing enforcement on my MBP since my company's VPN client (GlobalProtect) is failing the signature check now. This started yesterday when I did the OS upgrade ...
0
votes
1answer
1k views

What is the proper syntax for setting the nvram backlight-level?

I am trying to set my laptop's brightness level via nvram backlight-level= however I keep receiving errors, no matter how I try and input it. These are my past results. ~ nvram backlight-level "%96%...
4
votes
0answers
674 views

Does system integrity protection prevent nvram(8) from setting -x as a boot argument for safe mode?

When pre-release macOS Sierra is in safe mode with -x as a boot argument in NVRAM, the following command works as expected: sudo nvram boot-args="-v" When Sierra is booted in normal mode, the ...
0
votes
2answers
1k views

MacBook taking long time to load the boot loader; rEFInd freezes

I have a MacBook Pro 2015 and I am dual booting with Linux. I use rEFInd and since day 1 it has been working fine on most occasions. Sometimes it would take a long time to show its screen and then it ...
1
vote
0answers
350 views

saving / restoring the NVRAM

I need to find a reliable way to save and restore the contents of NVRAM. Would this be correct? Preservation nvram -x -p > ~/nvram.xml Recovery: sudo nvram -x -f ~/nvram.xml
0
votes
1answer
2k views

High fan, No battery symbol, Battery not charging on Macbook Pro Mid 2009

Recently, my MacBook Pro has had the following issues: If the battery dies, I need to do an SMC reset for it to even start up. When it does, the fan is running at high speed and there is either no ...
1
vote
1answer
279 views

MacBook Pro (late 2013) w/ Yosemite & FileVault won't boot: LCD light only, no other activity

After lid-sleeping my machine with ~10% battery left, a few hours later, attached to AC power, it would not wake from lid-open, keypress, or short power-button-press. After doing a long-power-button-...
13
votes
4answers
30k views

El Capitan /private/var/folders cache files consuming 30–40 GB

I've upgraded my MacBook Pro to El Capitan recently, and one of the first unpleasant changes, other than XtraFinder & TotalTerminal no longer being compatible, is that the system deems it ...
1
vote
1answer
332 views

Do I need NVRAM/SMC reset to restore a used MacBook Air to defaults?

I've bought a used MacBook Air (Mid 2013) running Yosemite and I'd like to restore every setting to defaults, as in, start over with a fresh clean OS. What are the things I have to run to make sure ...
3
votes
2answers
2k views

Spoofing a serial number on a MacBook Pro

I have a MacBook Pro that got liquid spilled on it. I cleaned it up and everything works except the fact that it no longer has a serial number. When I go to look at System Information, it says "Serial ...
2
votes
1answer
237 views

Yosemite turns on “reduce transparency” at every login or wake after battery failure

Recently, I was using my rMBP on battery power, with about 20%-30% remaining battery, according to the battery indicator. It suddenly shut off, and would not power on (not even showing the "battery ...
2
votes
1answer
283 views

MacBook Pro Mid 2012 startup chime from right speaker only

After installing a ssd into my Macbook pro mid 2012 (not retina), i noticed that the startup chime is coming only from the right speaker. (I am not sure if it was always like that or if its because of ...
4
votes
6answers
25k views

Desktop icons have disappeared after using HDMI cable (Yosemite)

I had a strange issue recently where I had to reset PRAM after using an HDMI cable with my MBP (it had a blank screen on boot). I feel like this is again related to the HDMI cable. After using it, ...
5
votes
1answer
12k views

What does “sudo nvram boot-args=”debug=0x10“” do to my Mac?

Because Parallels Desktop 10 and Fusion 7 both run slow on Yosemite, there are KB articles which make the users execute sudo nvram boot-args="debug=0x10" For instance here: http://kb.parallels.com/...
3
votes
3answers
7k views

Clearing NVRAM on Yosemite shows password entry

When I make the ⌘ Cmd+⌥ Opt+P+R it shows a dialog with lock symbol and to proceed I have to give the password but this way I'm not able to proceed with the resetting of the PRAM. How can I reset the ...
3
votes
1answer
11k views

Can Find My Mac still persist after erasing the hard drive?

I have recently acquired a MacBook Air 2011 off of ebay. In order to avoid second-hand Mac issues relating to iCloud remote shut downs, I have performed the following actions: Secure erase (using ...
6
votes
1answer
56k views

Resetting PRAM without a(n) (Apple) keyboard?

A while back I had an issue with my (2013) iMac not recognizing the keyboard after it was unplugged and re-plugged in. I had to actually power down the iMac and power it back up before it would ...
3
votes
1answer
5k views

nvram boot-args to boot in target disk mode

I'd like a Mac to always boot in target disk mode. Similarly to setting sudo nvram boot-args="-v" which boots in verbose mode, I tried sudo nvram boot-args="-t" but to no avail. Any idea?
2
votes
1answer
151 views

System boot chime right speaker only

I recently replaced the internal hdd inside my macbook pro mid 2012 with a ssd. Now it seems that the system chime (the "boong" that goes off when i turn it on) only plays through the right speaker. ...
0
votes
1answer
321 views

Loading gif and progress bar on start up

After doing a pram and a smc reset my late 2011 mac book pro 10.8 shows the apple logo on a grey screen with a loading gif and a progress bar which once finished the mac just turns off. I have got ...
0
votes
1answer
2k views

(Update Needed?) after PRAM reset, File Vault seems bricked

After many system instabilities and freezes I was suggested to do a PRAM reset. When I boot now and the File Vault asks for the password to decrypt the SSD the Guest user is gone and my user lost his ...
0
votes
1answer
126 views

delay after opening lid display dark until key pressed

okay so my MBP Mid 2010 was took a little tumble (it was in a felt sleeve which was inside a backpack) today and since has been acting weird. when i open the lid, the login screen does not come back ...
0
votes
2answers
538 views

nvram -p shows “LocationServicesEnabled %01” … does that mean I have a GPS?

What does LocationServicesEnabled mean on a MacBookPro Retina?
1
vote
2answers
5k views

Troubles with resetting PRAM

I followed Apple's instruction to reset PRAM ("Press and hold the Command-Option-P-R keys before the gray screen appears.") and the only thing that happened was that my Mac rebooted repeatedly until I ...
9
votes
1answer
14k views

How can I view/inspect my Mac’s Parameter RAM (NVRAM)?

Inspired by this question I started looking for apps that allow to read the data saved in my Mac’s Parameter RAM. Aside from a very antique (pre OS X) application for Classic, I could not find any. Is ...
3
votes
1answer
415 views

MacBook Pro will not wake from sleep after installing third party application

I installed an application called Air Parrot that uses air play with an Apple tv to mirror or extend the desktop. I noticed that after I installed it, I am no longer able to wake my Mac from sleep. ...
3
votes
1answer
3k views

PRAM and NVRAM differences and overlap with eachother and UEFI firmware chip

Is PRAM stored on the same NVRAM chip that non-PRAM variables are stored. I always assumed that NVRAM was the UEFI firmware chip on the logic board. Are all of these one in the same (NVRAM - PRAM - ...
0
votes
3answers
13k views

Poor battery performance after SSD install

I recently installed a Crucial SSD into my Macbook Pro (2.66 GHz Intel Core i7), and now the performance of my battery is probably about 50% of what it used to be. I've tried to reset the PRAM, but ...
2
votes
2answers
3k views

Can't reset PRAM and reinstall OS!

I have a problem with my MacBook Pro 2010 13 inch, 2.4 GHz. Originally I had Snow Leopard installed on my Mac, then I was trying to upgrade it to Lion (official version from App Store). During the ...
3
votes
3answers
8k views

How can I reset the PRAM if Recovery Mode keeps overriding the PRAM command?

Lion uses the ⌘ + R to boot into recovery mode. Resetting the PRAM in anything less than 10.7 was ⌘ + ⌥ + P + R. Recovery mode now seems to override the PRAM command. Does anyone ...

1
2