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ghoffman
Punch Card
Posts: 25
Registered: ‎06-19-2011
Location: usa
Views: 739
Message 1 of 6

t520 display blanks and flashes when plugging/unplugging ac power

the subject says it all.

brand new t520 with optimus (nvidia+intel) display adapter, 1920x1080 screen.

whenever i plus in or unplug power, the display blanks for about 2 seconds, then flashes back on.

the problem occurs whether the bios setting is integrated, dicrete, or optimus, and th problem occurs even if the display settings are the same in power profile for AC and battery.

 

is this normal? it is very BAD.

 

thanks in advance.

george

Former Employee
Posts: 2,437
Registered: ‎04-10-2011
Location: Malaysia
Views: 724
Message 2 of 6

Re: t520 display blanks and flashes when plugging/unplugging ac power

hey ghoffman,

uninstall the current graphic driver that you have. let windows install its own generic drivers.

once generic driver has been installed, test again and see if the problem occurs. If it does not, continue by going to our support site via http://support.lenovo.com

download the latest graphic driver for your unit, install it and test again.





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Guru
Posts: 9,598
Registered: ‎12-26-2009
Location: CA
Views: 722
Message 3 of 6

Re: t520 display blanks and flashes when plugging/unplugging ac power

Sounds like it's doing the 50Hz/60Hz switch...

W520: 2960XM, Q2000M @ 1091/1380, 32GB RAM, 500GB&750GB HDD & 500GB SSD, FHD&MB168B+
X61T: L7500, 4GB RAM, 500GB HDD, XGA screen, Ultrabase
W550s: 5600U, K620M at 1164/1281, 16GB RAM, 512GB SSD, 3K touchscreen
X200s: SL9400, 6GB RAM, 64GB SD card, WXGA+ screen
TPT1: 1839-23U
Former Employee
Posts: 3,823
Registered: ‎07-11-2010
Location: Malaysia
Views: 719
Message 4 of 6

Re: t520 display blanks and flashes when plugging/unplugging ac power

Agree with ColonelONeill,

@ghoffman,

There seems to be a bug with the Intel GPU.

Try step provided in this KB.

http://forum.lenovo.com/t5/T400-T500-and-newer-T-series/T420s-Screen-refresh-rate-drop-to-50Hz-when-...

//JameZ
ghoffman
Punch Card
Posts: 25
Registered: ‎06-19-2011
Location: usa
Views: 700
Message 5 of 6

Re: t520 display blanks and flashes when plugging/unplugging ac power

yes, it is the 50/60 hz problem.

i made it go away by setting both ac and battery operation to 50hz.  this is not optimal for external displays, but it is fine (for me) on the laptop display.

thank you

 

Arjun_Jarwal
What's DOS?
Posts: 1
Registered: ‎08-25-2018
Location: IN
Views: 93
Message 6 of 6

Re: t520 display blanks and flashes when plugging/unplugging ac power

Hello ,

 

I too had this problem with my lenovo L560, I changed intel display setting and it worked for me.

 

Go to desktop -->right click--graphics properties---power setting/intel monitor setting---disable the "Display refresh rate switching"

 

thanks,

Arjunsingh

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