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Having trouble installing a piece of hardware? Want to know if that peripheral is compatible with Linux?

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Old 11-29-2023, 10:15 PM   #1
pedpup2
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displayport allows only 1024x768 resolution


HP 8560p laptop running Debian Linux.
I have an external 23" monitor with a VGA and DVI-D port.
I installed a DVI-D to HDMI adapter, and a DisplayPort to HDMI adapter ( at the laptop end). Top resolution is 1024x768.

I checked the specs of the laptop;'s DP - and it allows more than 1920x1080.
The monitor on VGA works to 1920X1080. The DP to HDMI adapter is rated
to 4k ( 1080p). Yet can't get more than 1024x768 from DP. ?

I tried the monitor plugged into a DELL E7450's HDMI port, and it works to
1080p.

I changed operating systems twice on the HP( once to Linux Mint, and once to Windows 10), and still the same result.

??? Can any one help? I am relatively new to the depths of Linux, though I've been using it for a few years.

Thanks
 
Old 11-30-2023, 04:44 AM   #2
business_kid
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It's a bandwidth issue.

1024x768x60 = 47,185,920 Hz.
1920x1080x60 = 124,416,000 Hz. The cable designs/adaptors never conceived that sort of speed back in the 1980s/1990s.

It won't get better. Live with it. 1024x600 might give a better aspect ratio.

Last edited by business_kid; 11-30-2023 at 04:47 AM.
 
Old 11-30-2023, 04:57 AM   #3
lvm_
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I wonder where the 80's came from - DVI is the oldest standard here and it was introduced in 1999 and can handle minimum 1920*1200*60fps. OP may try creating EDID profile manually for this monitor, but I doubt if linux mastery will help to break through this horrible chain of adapters.
 
Old 11-30-2023, 12:58 PM   #4
pedpup2
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Thanks to you both,

"horrible chain of adapters" LOL -

seems like we are pointing to the DP to HDMI adapter...well, possible..
it was a cheap adapter.

And, the HDMI cable through the adapter to DVI-D input on the monitor
worked from a direct HDMI output on my Dell lap( and, as a matter of fact, is also working
on another computer/monitor I have ), so I guess I'd better think of upgrading this
8560p to a lap with a native HDMI port.

Anyway, the VGA connection from the HP to the monitor is working at 1920x1080,
and I can live with that ( not doing high-end graphics work..)

Thanks again for the info..

pedpup2
 
  


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