Go Back   nV News Forums > Linux Support Forums > NVIDIA Linux

Newegg Daily Deals

Reply
 
Thread Tools
Old 12-21-10, 11:39 PM   #1
DBabo
Registered User
 
Join Date: Dec 2010
Posts: 15
Angry [SOLVED]260.19.12, GeForce GT 240 (GPU 0),ViewSonic VA1912wSERIES - screen flickering

Hello,
I have been running centos on this aspire (ast 160) machine for a long time. I always used the built in video card - some sort of nvidia.
Recently - ~ 1 year ago , i purchased and happily lived with GTX240 card.
Fairly recently i noticed that my screen started flickering - sometimes i can't see, but sometimes it's obvious.
Here is xconfig:
Code:
cat /etc/X11/xorg.conf
# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 260.19.12  (buildmeister@builder101)  Fri Oct  8 13:53:51 PDT 2010

# Xorg configuration created by system-config-display

Section "ServerLayout"
    Identifier     "single head configuration"
    Screen      0  "Screen0" 0 0
    InputDevice    "Mouse0" "CorePointer"
    InputDevice    "Keyboard0" "CoreKeyboard"
    Option         "Xinerama" "0"
EndSection

Section "InputDevice"

    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/input/mice"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
    Identifier     "Keyboard0"
    Driver         "kbd"
    Option         "XkbModel" "pc105"
    Option         "XkbLayout" "us"
EndSection
Section "Monitor"

 ### Comment all HorizSync and VertSync values to use DDC:
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "ViewSonic VA1912wSERIES"
    HorizSync       30.0 - 82.0
    VertRefresh     60.0 - 85.0
    Option         "dpms"
EndSection

Section "Device"
    Identifier     "Videocard0"
    Driver         "nvidia"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GT 240"
    Option         "UseEDID" "True"
EndSection

Section "Screen"
# Removed Option "metamodes" "1440x900 +0+0"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "TwinView" "0"
    Option         "metamodes" "1440x900_60 +0+0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection
I'm pretty dumb when it comes to the video cards - i don't use them other then for office applications.

I remember in old times such "flickering" used to be sign of incorrect refresh rate setting on the vcard. But (it seems) that i have it "hard-coded" to 60 :
Code:
    VertRefresh     60.0 - 85.0
also nvidia-settings report the the refresh rate on "Flat Panel Information" in the "DFP-0" section as 59.89.

The easiest way to observe the flickering is to looks at some graphic with high density of small ( 1-3 pixels ) dots - the whole area is flickering ....
Very annoying.

Please help.

Last edited by DBabo; 01-05-11 at 07:57 PM. Reason: title change to [solved]
DBabo is offline   Reply With Quote
Old 12-22-10, 09:51 AM   #2
DBabo
Registered User
 
Join Date: Dec 2010
Posts: 15
Default Re: 260.19.12, GeForce GT 240 (GPU 0),ViewSonic VA1912wSERIES (DFP-0) - screen flicke

Here is the video i took to illustrate the problem. It's difficult to capture, but i hope you will understand.

http://www.filefactory.com/file/b4cb11f/n/00006.mtshttp://www.filefactory.com/file/b4cb11f/n/00006.mts

as per Artem's suggestions http://www.mediafire.com/?8ycu8mpmo5voidx
DBabo is offline   Reply With Quote
Old 12-22-10, 12:22 PM   #3
DBabo
Registered User
 
Join Date: Dec 2010
Posts: 15
Default Re: 260.19.12, GeForce GT 240 (GPU 0),ViewSonic VA1912wSERIES (DFP-0) - screen flicke

I figured it maybe useful to upload the xorg.log.
Attached Files
File Type: log Xorg.0.log (26.5 KB, 60 views)
DBabo is offline   Reply With Quote
Old 12-22-10, 04:03 PM   #4
artem
Registered User
 
Join Date: Jun 2006
Posts: 710
Default Re: 260.19.12, GeForce GT 240 (GPU 0),ViewSonic VA1912wSERIES (DFP-0) - screen flicke

Next time upload to http://mediafire.com

This seems to be a hardware problem - check cables, PSU, etc.
artem is offline   Reply With Quote
Old 12-24-10, 03:34 PM   #5
DBabo
Registered User
 
Join Date: Dec 2010
Posts: 15
Default Re: 260.19.12, GeForce GT 240 (GPU 0),ViewSonic VA1912wSERIES (DFP-0) - screen flicke

Artem,
thank you for the reply.
why do you think it's HW related?
I recently rebooted the machine. Here are a few observations:
1. in 800x600 ( or whatever the console's resolution is nowadays) - there is no blinking/flickering
2. When the X loads - and there are no applications(windows) open - no blinking/flickering observed.
3. When i click on the "Start" button and the menu opens i can see the flickering and the there is , hmm, i guess, a horizontal line across the rest of the screen.
4. If the windows from my video is small ( whatever is the default size of the window) there is no flickering, but once i stretch it a bit ( 1-2 sm) wider - the flickering/blinking is back.
DBabo is offline   Reply With Quote
Old 12-25-10, 04:06 AM   #6
artem
Registered User
 
Join Date: Jun 2006
Posts: 710
Default Re: 260.19.12, GeForce GT 240 (GPU 0),ViewSonic VA1912wSERIES (DFP-0) - screen flicke

I think so, because you're the first person to have this exact problem on these forums.

Of course, I can be wrong.
artem is offline   Reply With Quote
Old 12-25-10, 07:18 AM   #7
Deanjo
Registered User
 
Join Date: Aug 2004
Posts: 301
Default Re: 260.19.12, GeForce GT 240 (GPU 0),ViewSonic VA1912wSERIES (DFP-0) - screen flicke

It certainly sounds like a connection issue to me. If the card is dual head try flipping the cable over to the other connector. I would also check the connection at the back of the monitor.
Deanjo is offline   Reply With Quote
Old 12-25-10, 07:25 AM   #8
Deanjo
Registered User
 
Join Date: Aug 2004
Posts: 301
Default Re: 260.19.12, GeForce GT 240 (GPU 0),ViewSonic VA1912wSERIES (DFP-0) - screen flicke

Also the first hit on google searching for "VA1912w flicker" on this monitor takes you here:

http://blog.vidulich.info/2010/12/re...viewsonic.html

I would also boot into windows if you have it and see if the flicker is there. Also try the vga connector on the monitor instead of the dvi, or vice versa.
Deanjo is offline   Reply With Quote

Old 12-25-10, 11:49 AM   #9
DBabo
Registered User
 
Join Date: Dec 2010
Posts: 15
Default Re: 260.19.12, GeForce GT 240 (GPU 0),ViewSonic VA1912wSERIES (DFP-0) - screen flicke

uhhh, guys, you are making %) me do some heavy physical lifting - have to move the furniture away from the wall to get to the PC back panel. and i hoped to get away with RMI on the card %).
Will do it over the weekend and see if i can spot anything.
Thank you!
DBabo is offline   Reply With Quote
Old 12-26-10, 03:31 PM   #10
DBabo
Registered User
 
Join Date: Dec 2010
Posts: 15
Default Re: 260.19.12, GeForce GT 240 (GPU 0),ViewSonic VA1912wSERIES (DFP-0) - screen flicke

I read the link and proceeded with :
1. decreasing the contrast and brightness
2. i attached the analog input to my laptop

Observations:
once the contrast and brightness were decreased i could clearly observe the horizontal "zebra" - the lines of white(er) and dark(er) lines with the whole svreen flickering... same affect like when you tape the TV , it's just there you (usually) have one line going from bottom up - here i have multiple ones. ( see attached link)
Second i switched input from the PC in question to a laptop's running windows XP ( for years).
As you can see - laptop picture looks perfect, and monitor is still the same.
This leads me to the conclusion that my LCD gave me a nice Xmas present
let's see if i can spot anything obvious and maybe replace it.

http://www.mediafire.com/?1de8fsx1xor6vrf
DBabo is offline   Reply With Quote
Old 01-05-11, 07:55 PM   #11
DBabo
Registered User
 
Join Date: Dec 2010
Posts: 15
Default Re: 260.19.12, GeForce GT 240 (GPU 0),ViewSonic VA1912wSERIES (DFP-0) - screen flicke

and our winner is Artem, who correctly guessed the cause of the problem - it was HW based. I had to fix the LCD and now life is good again

Thank you guys and happy New Year and Christmas!
DBabo is offline   Reply With Quote
Reply


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 03:11 AM.


Powered by vBulletin® Version 3.7.1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright 1998 - 2014, nV News.