/g/ - Technology » Thread #17272269

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Anonymous Mon 02 May 2011 17:06:00 No.17272269 View View Reply Original Report

Quoted By:

So, I have a laptop running Linux, and I often connect it to my TV (1920x1080@60) over VGA (as my laptop doesn't have HDMI output) to watch movies, etc. My old VGA cable can reliably reach 1920x1080@60 just fine, and although there are no standards specifying VGA connector's resolution maximum, 2048x1536@85 is the common, generally accepted maximum among all cables. However, I bought two cables on Saturday, one 2m and one 5m. Yet, they can only reach 1360x768@60 on my TV. Why is this? Here's some relevant Xorg.0.log output:

[ 18.896] (II) intel(0): Not using default mode "1920x1080" (hsync out of range)

Anonymous

Anonymous Mon 02 May 2011 17:08:00 No.17272287 Report

Quoted By: >>17272298

Does it still work with the old cable?

Anonymous

Anonymous Mon 02 May 2011 17:10:00 No.17272298 Report

Quoted By: >>17272323

>>17272287
Yes, the old cable still allows me to reach 1920x1080@60.

Anonymous

Anonymous Mon 02 May 2011 17:13:00 No.17272323 Report

Quoted By: >>17272343

>>17272298
I would guess that the new cables are simply so poor that they can't handle bandwidth needed for 1920x1080 then.

Anonymous

Anonymous Mon 02 May 2011 17:15:00 No.17272343 Report

Quoted By: >>17272383

>>17272323
Hmm, that's disappointing. I guess my naive belief that all cables are equal only really applies to digital ones, then.

Anonymous

Anonymous Mon 02 May 2011 17:20:00 No.17272383 Report

Quoted By:

>>17272343
Honestly I can't say I've ever read about that kind of issue with VGA cables before. Really shouldn't just fail and throw an out of range error. The horizontal sync rate for 1920x1080@60Hz is very close to that of 1024x768@85Hz which is very standard even for low end CRT monitors. However, 1920x1080@60Hz does push nearly double the bandwidth through the cable than 1024x768@85Hz. So maybe a lack of bandwidth is just throwing an hsync error. Usually, a CRT monitor would itself display such an error, but I don't think a TV would.

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