[ltp] 1600 gray vertical bars on external monitor at 1600x1200

[Richard Neill]

Ben Pearre wrote:
> Hi!
> 
> R40 (2897gwu), latest Debian unstable, ATI Radeon Mobility 7500 (Xorg
> radeon driver)... more details below.
> 
> I'm trying to use an external monitor--a Dell 2000FP.
> 
> At 1280x1024 and lower, everything is great.
> 
> At 1600x1200 (native resolution of my external monitor, being driven,
> in this case, by the Thinkpad D-sub analog out), I get a weird pattern
> of gray vertical bars (1600 of them, I suspect, although I have not
> counted) over the whole monitor.  It's most visible on a solid
> background (especially white or black), but it's omnipresent.
> 

I just looked at your image. Try also

a)Disable sub-pixel font rendering and font anti-aliasing.

b)LCD monitors auto-adjust by aligning their clock with vertical lines 
in the image. But, if all the fonts are antialiased, there are no hard 
edges to crunch on, and the monitor calibration is often poor. Here is a 
1280x1024 chessboard: view it at 100% size, then press audo-adjust on 
the monitor.
http://www.richardneill.org/a22p-mdk11-0_files/lcd-cal-1280x1024.png


Any good?

Richard