I am getting very light horizontal waves on my 19 inch Acer monitor screen. At first I thought they were coming from videos I was watching, but they also occur on other displays. I checked the connectors on my VGA cable, then changed to a new cable. Sometimes they move up, sometimes down, sometimes they disappear. At this moment they have stopped.
My VGA information.
01:05.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RS780L [Radeon 3000] (prog-if 00 [VGA controller])
Subsystem: Biostar Microtech Int'l Corp Device 0017
Flags: bus master, fast devsel, latency 0, IRQ 18, NUMA node 0
Memory at d0000000 (32-bit, prefetchable) [size=256]
I/O ports at d000 [size=256]
Memory at febf0000 (32-bit, non-prefetchable) [size=64]
Memory at fea00000 (32-bit, non-prefetchable) [size=1]
[virtual] Expansion ROM at 000c0000 [disabled] [size=128]
Capabilities: <access denied>
Kernel driver in use: radeon
Where do I start to diagnose the problem? Whoops! They just started again.[/size][/size][/size][/size][/size]
It could be due to a shielding issue with the VGA cable, and from experience quality does matter. Many modern VGA cables are not of high quality. Most of us are now using digital interfaces (HDMI and DisplayPort). I really don’t miss analog video signalling.
Is your Acer an old CRT screen? Does your Radeon provide any digital outputs that match your Acer?
I don’t think developers pay much attention to analog (VGA) video any more. Digital quality is much better, and has been around for more than two decades now. As Deano suggested, cable quality matters, but there could be a software problem too. From Konsole or other GUI terminal, please provide output from
Yes, I’m inclined to agree. Newer cables are thinner than they were 20 years ago, and metal shielding costs money. Unfortunately all my three monitors are 4:3 ratio and VGA and replacing them with HDMI models is beyond my budget at this time.
or upgrade inxi to the TW version, then post output from:
Please also post output from:
cat /var/log/Xorg.0.log | susepaste
If a file not found message results, instead paste output from:
cat ~/.local/share/xorg/Xorg.0.log | susepaste
all my three monitors are 4:3 ratio and VGA and replacing them with HDMI models is beyond my budget at this time.
Sorry to hear that. Do Sweden and Mexico not have thrift stores like we have in USA? Flat panel monitors with digital inputs routinely show up in them around here for chump change, far less than a motor fuel fillup.
ILL you’re using VGA connector soldered on Biostar mobo.
Avoid doing that. Use discrete ATI/AMD video card, better with Terascale 2 or 3 chip (Radeon HD 5000 or 6000 series).
Do not use Nvidia and builtin graphics for VGA output.
Of course, using digital connection is preferable.
Set horizontal frequency for monitor. With VGA input press “Auto adjust” button on monitor.
I live in a small town. I am sure that I could find a thrift shop in Mexico City if I had a car, but that’s 270km. away and one of the most confusing cities in the world. As for Sweden, there are thrift shops in my home town but none seem to sell computer parts. In any case I’m banned from Sweden at present (Covid) and there would be the problem of bringing monitors back to Mexico. There is a Mexican online thrift page, but I have been burned buying different products. I can live with the problem, and I will try to but an HDMI monitor for at least the box that I use the most.
The data suggests you’re running @60Hz refresh on a display that supports 75. CRTs generally run best at the highest supported refresh. If this helps it can be put into a startup script to run automatically, if XFCE doesn’t have a setting where you can set monitor refresh to 75.
Some VGA cables only have 14 connectors instead of the 15 possible. Sometimes a change to a 15 pin cable helps.
On what basis? In post #5 he suggests his screens are 20 years old, 4:3 ratio, and lack digital outputs. His log says the display is using 1280x1024 resolution, which is a 5:4 mode. These things smell like CRT to me. In contrast, his log says his Acer was made in 2009, but it also says 75Hz is supported for 1280x1024 (and 1024x768, and 1152x864), while it reports display size of 34mm by 27mm, which matches a 17" 5:4 1280x1024 LCD closer than anything else. I’m now of the opinion that this Acer is more likely suffering from one or more failed/failing electrolytic capacitors, rather than a software issue. Acer is known for using cheap caps in its displays.