Screen stays blank following power management on idle?

Recently, I've noticed several occasions when I've returned to my laptop after some time to find that the screen is blank (or the display is off? is there a difference?) and that the display does not return on keypress etc.
I've found a number of threads about a superficially similar issue following sleep or attempted sleep but that's not the problem in my case. This has only happened to me (so far) on AC and the laptop is not set to sleep, suspend or hibernate automatically when on AC. Moreover, I don't think I've seen the problem following a resume from sleep etc. In fact, it is sometimes possible to restore the display by putting the machine to sleep and then waking it up. (Either put to sleep using sleep button or closing lid; waking by opening lid and hitting fn key.) All the other reports I've found describe a problem following an attempted sleep/suspend/hibernate.
The other way I can sometimes get the display back is by switching to another tty and then back to X. I'm not sure if it is just that the switch in itself changes something or if the problem is an X-specific one which is overcome by switching from and to X.
I haven't noticed any particular pattern to this. It doesn't happen every time and it is not directly related to how long the laptop is left idling. I might leave it for hours and find it resumes on any key press or I might leave it for half an hour and find I have to mess around to get the display back.
I realise that this is not enough information to suggest a solution (unless somebody recognises exactly the same issue) but I'm hoping somebody can suggest a way to figure out what's going on. Where should I be looking? I can't find anything especially obvious looking in dmesg, for example. (Might not mean much - glaringly clear might be non-obvious to me.) I also haven't found anything suspicious/relevant looking in e.g. ~/.xsession-errors.
I did find one warning from ACPI in dmesg output but googling this has just found a bunch of threads where people explain that it isn't really an error and is probably harmless - may even be importantly protective, in fact, and is just the kernel doing its job. The verdict seems to be: ignore and be happy. Just in case, here's the ACPI warning:
[ 8.518350] ACPI: Requesting acpi_cpufreq
[ 9.196096] iTCO_vendor_support: vendor-support=0
[ 9.196422] thermal LNXTHERM:00: registered as thermal_zone0
[ 9.196426] ACPI: Thermal Zone [TZ00] (49 C)
[ 9.270402] ACPI: Battery Slot [BAT1] (battery present)
[ 9.355245] ACPI Warning: 0x000000000000efa0-0x000000000000efbf SystemIO conflicts with Region \_SB_.PCI0.SBUS.SMBI 1 (20120320/utaddress-251)
[ 9.355256] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver
[ 9.359971] mei: module is from the staging directory, the quality is unknown, you have been warned.
[ 9.360271] mei 0000:00:16.0: setting latency timer to 64
[ 9.360405] mei 0000:00:16.0: irq 42 for MSI/MSI-X

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My Power Mac G5 goes into the power sving mode on the start up and screen stays blank. Monitor is OK. Help.....

I Hv a Power Mac G5. s soon as I power it on, the monitor (Lacie) screen flashes a message saying It has gone into Power Saving mode and the screen stays blank.
Once it happened before and was told to keep Command, option, P & R kes pressed while it is starting up and to keep it pressed untill it restarts. Tried that, but it does not work.
How do I correct it?
Please help.....
I am located in India. and trying to exhaust all available options before I contact Apple Support......

It sounds like your video card is not coming up, as the monitor is indicating that it probably has no active video coming from the computer.
Two things to try:
First, does video come up in safe boot (hold the shift key down while powering up)?
Second, how old is the PRAM backup battery? While not a universal cause of video not coming up, we have seen reports of a weak PRAM backup battery being the cause of that failure. If the battery is more than a couple of years old, a replacement is a good and relatively inexpensive initial troubleshooting step. (My own theory is that at boot, the PRAM yields garbage data to the system which, in some cases, crashes a video driver or does other mischief.)
If the computer is otherwise coming up OK, that is to say, you power it up and it hasn't clicked itself off and after a few minutes the fans haven't ramped into high gear, which indicates that the system is actually up and running even without video output, then it is relatively likeley that the video card has failed and must be replaced.
One final thing to try would be a PMU or SMU reset (depending on where your G5 is in the progression of the model). Information on PMU is here and information on SMU is here.

Satellite Pro P100 - Screen stays blank

Computer seems to be on, but the laptop screen stays blank.
Ok so right now the power light is on and HD and the back fan is not on, and when I press the power button, the HD and the back fan comes on and then the power light just flashes, but nothing is on the screen, and the the keyboard lights (capslock/numlock etc) do not flash like they would on a boot up. That leads me to assume that the laptop is hibernating or something, but it should come out of hibernation (if it was) on a press on the power button, but nothing happens when I do that.
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Hi
Hm, it could be a mainboard issue or something else. I doubt that its a problem of the internal display because tested an external display and there you can notice the same issue.
What you can do is this following workaround: Remove the battery and AC/DC adaptor and then wait one hour. Connect the AC/DC adaptor and battery again. Now you can try to start the notebook again.
If it doesnt work I would ask a notebook technician from an authorized service provider. Maybe its a hardware malfunction and the ASP can test your notebook.
Bye

X60 - Screen flickers and screen shutoff - problem with power management or hardware failure?

Hello everyone,
this is one of the longest unsolved threads in Lenovo Forum. To keep a summary of the posts for new victims (as suggested by PDG in page 23, edited by me):
Bottom line:
This is a video driver problem
If you have XP and can, roll back to 4450 (I currently run with 4860 in XP without problems)
If you have Vista you are basically screwed. No one has posted any link to a functioning V32 driver.
You can find a link to a backlevel XP driver on p.21 or thereabouts.
{Windows 7, Linux} may or may not help. (no problems for me with Ubuntu 8,9 currently)
LENOVO WILL NOT HELP. Don't waste your time. Lenovo will say its a hardware problem because that's all they know and charge you big bux to do basically nothing when you ship them your PC.
This is the original entry:
Hi,
I always stay at the current level of available drivers with System Update.
In the last days the screen starts to flicker / jiggle once in several minutes until suddenly the whole screen turns black and can't be reactivated. I then put the X60 into standby and it wake up right after. The screen is then turned on again...
Its a 1706-AA7...
I rolled back the graphics driver to an earlier version, didn't help. Does it look like some faulty power management? Or a potential HW issue?
dsp
UPDATE: this time the screen was totally light blue... same workaround: standby -> wakeup
UPDATE2: I removed the driver completely and installed it manually from the driver matrix page. It took a couple of reboots. In between resolution was down to 640x480 with 4 bit. Not its working again without flickering...
Was this a wrong driver pushed via System Update?
Message Edited by dsp on 04-07-2008 07:01 AM
Solved!
Go to Solution.

Hi,
no - 2 video adapters are correct! You should not remove them. Read the Intel FAQ here.
Strange - could it be that it also updated your video driver the same time? When I rolled back the video driver to a very old version, I never experienced the flicker again. No colorful blanks anymore.
The Intel downloadpage offers a backlevel driver for the chipset;
* Microsoft Windows* XP
* Driver Revision: Production Version 14.32.3
* Package: 43262
* Graphics: 6.14.10.4906
* HDMI Audio: 5.10.0.1030 But I don't know whether I should try. This release doesn't appear in the Thinkpad video driver history. Hopefully the bug will be acknowledged and they work for a fix. Where should bugs be reported, when they are not taken serious by the first level support?
dsp
Message Edited by dsp on 05-06-2008 01:19 PM

When I turn my ipod on why does the screen stay blank and then turn itself off?

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You can try holding the power button down for 10-15 seconds to see if anything appears on the screen. With iTunes running on your computer, you can try plugging it in to see if the device appears within iTunes. If neither test works then you probably have a dead iPod as posted before.

Macbook won't start up and the screen stays blank but the light is on...

So one day randomly my macbook screen turned blank but he white light stayed lit up entirely. I tried moving the mouse around but the screen remained blank. I've tried to shut the macbook off and turn it on again and the white light goes off and on when I do that but the screen remains blank and the start up chime is not heard.
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chubster88 wrote:
So one day randomly my macbook screen turned blank but he white light stayed lit up entirely. I tried moving the mouse around but the screen remained blank. I've tried to shut the macbook off and turn it on again and the white light goes off and on when I do that but the screen remains blank and the start up chime is not heard.
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deltatux

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Screen stays blank following power management on idle?

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