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Token Ring
bylund
Posts: 103
Registered: ‎05-13-2008
Location: Columbia, Mo.
0
Accepted Solution

X201i (3249 CTO): Screen turns of for a second while switching between battery, AC power

[ Edited ]

So I've had this problem ever since I first turned on the computer coming straight out of the box from Lenovo. Everything else works fine, but every time I go from battery to AC (or vice versa) the screen immediately changes brightness according to my settings and then turns completely off for 0.5-1 second before it is on again and everything is back to normal. This happens EVERY time, so it is a permanent, 100% recreatable (and reoccuring) problem.

 

I've googled for a solution, but all I've found is about updating drivers and uninstalling software - all of which are not applicable on this machine. All drivers are up to date and I have none of the problematic softwares installed. Anybody knows what might be wrong or, more importantly, how to fix this?

 

First I thought it was an issue with having a LED screen (I have experience of only LCD screens), but this doesn't make sense to me. I would really appreciate any responses and suggestions to this annoying problem.

 

FYI, I'm on a X201i (3249 CTO) with Win 7 home premium 64-bit.

 

Super thanks!


Moderator Note: Edited subject to match content.

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artami
Posts: 47
Registered: ‎06-03-2010
Location: UK
0

Re: Screen turns of for a second while switching between battery, AC power

Right click on the desktop, select graphics properties.

Select 50Hz for the refresh rate. 

 

That should fix it. If not also try selecting "max performance" under power/power plans.

 

Good luck! 

 

 

Token Ring
bylund
Posts: 103
Registered: ‎05-13-2008
Location: Columbia, Mo.
0

Re: Screen turns of for a second while switching between battery, AC power

Thanks, but the setting is already at 50Hz... and it doesn't matter if I'm running on Max Performance or a much lower power setting. Also doesn't matter if screen brightness is at max or if it is at, say, 4.

Community SuperMod
bananaman
Posts: 3,649
Registered: ‎04-25-2008
Location: San Francisco
0

Re: Screen turns of for a second while switching between battery, AC power

50Hz both on AC and battery?

I don't work for Lenovo. I'm a crazy volunteer!
Token Ring
bylund
Posts: 103
Registered: ‎05-13-2008
Location: Columbia, Mo.
0

Re: Screen turns of for a second while switching between battery, AC power

 


bananaman wrote:

50Hz both on AC and battery?


Yes, on both 50Hz and 60Hz and both AC and battery.

 

Token Ring
bylund
Posts: 103
Registered: ‎05-13-2008
Location: Columbia, Mo.
0

Re: Screen turns of for a second while switching between battery, AC power

May it have something to do with the black-and-white screen brightness bar shown when changing screen brightness? I just get a small peek of it, the screen dies, and then the screen turns on again as the brightness bar starts fading. 

 

Yet I have no such problem changing screen brightness manually; when e.g. using Fn+Home or End keys. The screen only turns off when switching between battery and AC...

Guru
ColonelONeill
Posts: 6,641
Registered: ‎12-26-2009
Location: Toronto
0

Re: Screen turns of for a second while switching between battery, AC power

Does it go away if you end the 3 igfx___.exe's in Task Manager? Those three do it for me on my T400.
W520: i7-2720QM, Q2000M at 1090/695/1390, 22GB RAM, 500GB HDD, FHD screen
TPT1: 1839-23U, stock ICS
X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Token Ring
bylund
Posts: 103
Registered: ‎05-13-2008
Location: Columbia, Mo.
0

Re: Screen turns of for a second while switching between battery, AC power

 


ColonelONeill wrote:
Does it go away if you end the 3 igfx___.exe's in Task Manager? Those three do it for me on my T400.

Thanks, ColonelONeill! There were four of those, but the answer is YES - the screen no longer turns off for a second after switching from AC to battery (and vice versa). So we have isolated and identified the problem - but what is the solution...?

 

Guru
ColonelONeill
Posts: 6,641
Registered: ‎12-26-2009
Location: Toronto
0

Re: Screen turns of for a second while switching between battery, AC power

The Intel control panel puts the chipset into low power mode by switching to a lower resolution and a lower power consumption mode, which seems to necessitate a screen blank.
W520: i7-2720QM, Q2000M at 1090/695/1390, 22GB RAM, 500GB HDD, FHD screen
TPT1: 1839-23U, stock ICS
X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Token Ring
bylund
Posts: 103
Registered: ‎05-13-2008
Location: Columbia, Mo.
0

Re: Screen turns of for a second while switching between battery, AC power

 


ColonelONeill wrote:
The Intel control panel puts the chipset into low power mode by switching to a lower resolution and a lower power consumption mode, which seems to necessitate a screen blank.

 

Seems to me it was probably easier to code it that way, but I don't see why it would be *necessary*. Especially since this has been the case on none of my other and previous machines. And also since it works fine when shutting down the IGFX services.

 

It doesn't cause real problems, but the very slow blink (the turning off and then on) of the screen is quite annoying and takes time from work. Intel should offer a solution to this problem (or maybe Lenovo should, since all drivers go through them).