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11-29-2023, 10:15 PM
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#1
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LQ Newbie
Registered: May 2017
Location: Fairfield, Iowa, USA
Distribution: SolydX 10 2019-09
Posts: 21
Rep:
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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
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11-30-2023, 04:44 AM
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#2
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LQ Guru
Registered: Jan 2006
Location: Ireland
Distribution: Slackware, Slarm64 & Android
Posts: 17,023
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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.
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11-30-2023, 04:57 AM
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#3
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Senior Member
Registered: Jul 2020
Posts: 1,205
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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.
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11-30-2023, 12:58 PM
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#4
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LQ Newbie
Registered: May 2017
Location: Fairfield, Iowa, USA
Distribution: SolydX 10 2019-09
Posts: 21
Original Poster
Rep:
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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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