06-12-2011 09:10 PM
I too have experienced the flickering lines on the screen. I have yet to determine a way to reliably reproduce the issue, but as others have said, it appears to occur most often after the computer has been powered on for a while and sitting idle.
I've had some luck in inducing the flickering lines by using the Catalyst Control Center (ccc) and changing the screen refresh rate and by enabling and disabling the 'LCD overdrive'. Both of these actions appear to exercise low level hardware features; could this be the cause of the flickering lines? For instance, the lines aren't always pure white or black; I've seen lines which had a gap very similar to the width of the Windows start button orb or the width of an icon. Maybe it's displaying some data from another row in the framebuffer or some other graphics memory issue?
I'm curious as to whether the flickering lines occur only on the Windows desktop, i.e. in the Aero desktop window manager. I've seen the issue with both maxmized and non-maxmized windows, and the lines disappear and reappear toggling between the original window state and maximized/windowed.
Some things that I want to test:
full screen 3d application such as a game or certain media players (exercises OpenGL or DirectDraw/3D)
Aero vs. Basic mode
06-13-2011 10:47 AM
06-13-2011 01:00 PM
OK this is driving me nuts. I bought an x120e about a month ago and for a while it was fine. About two weeks ago I started getting flickering lines occosionally, and it was inconsistent. Sometimes I use it for days and get no issue. Sometimes it starts doing that randomly and I can't get it to stop without rebooting. It drives me nuts. It just happened and I noticed that if I maximize a window (ex. chrome) it IMMEDIATELY starts doing that. I switched to a VGA monitor (disabled the internal one) and got the exact same thing, immediately continuing. I also tried closing and opening the lid (I have it set to do nothing when I close it, so the scren just turns off). But if the window is NOT maximized, it does NOT happen at all.
I have the ati 11.5 drivers from their site. I have the 2GB stock RAM and 2GB g.skill 1333MHz ram and the E350 CPU. I disabled Vari-Bright soon after getting the system, as it would change the screen brightness annoyingly when I worked (perhaps shifting my position caused the light sensor to detect a different amount of light). After reading some of these posts, I also disabled PowerPlay. Do you guys have any suggestions here?
Note: I just shut the laptop down, unplugged it and removed the battery for a moment, then put them back in and started windows. I maximized chrome and it is not happening right now. I'm sure it'll come back randomly though.
I read that UAC prompts can cause this, but I don't think I had one when that started. I'm on the balanced power plan. I installed SP1, and I'm running windows 7 home premium 64-bit. I'm running the latest BIOS update. I am NOT using aero transparency, opaque is enough for me.
The only third party things in/connected to the laptop are the g.skill ram and a logitech v220 usb mouse.
I tried dimming/making the screen lighter and it makes absolutely no difference - the flickering lines continue exactly the same. This has happened when the laptop was on battery and when it was plugged in (most recently I had it plugged in when it happened).
oh btw I'm was thinking about reinstalling windows with my own disc since there may be reminants of some lenovo utilties that didn't seem very useful and I removed right after getting the machine. Should I go ahead and do so?
06-13-2011 10:18 PM
06-14-2011 08:50 AM
But I think that it has to redraw if I close the lid (that's set to do nothing), as the screen is turned off. I think. But the issue instantly continues as soon as I reopen it. And you'd think that changing to an external monitor and disabling the internal one would force a redraw, which I think it does. But the issue continues. odd that UAC doesn't do that. I doubt maximizing a window forces an entire redraw - it doesn't take a moment, unlike all the other things. It's also so odd that rebooting fixes it. I left the machine on for a few hours to get it warmed up, lid closed, then used it and had absolutely no issues. Strange...
06-16-2011 09:25 PM
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X240 | 8GB RAM | 512GB Samsung SSD
08-10-2011 09:02 AM
08-10-2011 09:44 AM
Like it was discussed earlier in the thread, if you have access to a "stock" unit that consistently can be induced to give a bunch of flickering lines, PM JameZ to have it sent in to engineering so they can figure out exactly what part is causing the issue for everyone involved. As is, it might be related to the fact that all the screens we have can be sourced from three different suppliers, and some tolerance is just that little bit out-of-spec to cause the flickering lines. Of course, there's to way to tell until someone can actually send a unit in for this reason, so anything we do at this point might just be a placebo.