Hi, I used till now DVI to connect the PC to the monitor. I recently bought a digitus 4K HDMI switch 4x1 to be able to switch between 3 HDMI inputs. However when I switched on the PC and X started, all was messed. Default resolution was 1280x720 instead 1920x1080. The display area is partially out of the monitor size, so that the panel is not visible and lastly the quality of the image was really bad (like insufficient frequency or sync or whatever)
I switched back to the DVI cable and I am wondering if someone can point me to the right direction.
regards
deloptes composed on 2018-05-15 20:43 (UTC+0200):
I used till now DVI to connect the PC to the monitor. I recently bought a digitus 4K HDMI switch 4x1 to be able to switch between 3 HDMI inputs.
What model is that switch?
However when I switched on the PC and X started, all was messed. Default resolution was 1280x720 instead 1920x1080. The display area is partially out of the monitor size, so that the panel is not visible and lastly the quality of the image was really bad (like insufficient frequency or sync or whatever)
I switched back to the DVI cable and I am wondering if someone can point me to the right direction.
IME, most manufacturers of HDMI switches are incapable of making them work correctly - unless they do NOT include and automatic switching mode. Apparently they think everyone who uses them turns HDMI devices off when not in use (selected as the output by the switch).
The only one I've ever encountered that works reliably has no automatic switching function and is a long ago discontinued model.
Other than returning the switch as "defective", I can only think to suggest two things:
1-power off all HDMI sources except the one you wish selected, then cycle the power to the switch.
2-manually configure Xorg using xorg.conf to exclude possible modes except 1920x1080. (Set PreferredMode, and set HorizSync and VertRefresh to narrow ranges that can only compute to the 1920x1080 mode published in the manual or provided by EDID when connected without the switch inline).
Felix Miata wrote:
deloptes composed on 2018-05-15 20:43 (UTC+0200):
I used till now DVI to connect the PC to the monitor. I recently bought a digitus 4K HDMI switch 4x1 to be able to switch between 3 HDMI inputs.
What model is that switch?
Felix, I wonder sometimes if you really read the posts. I said it is "digitus 4K HDMI switch 4x1" - you ask what model.
However when I switched on the PC and X started, all was messed. Default resolution was 1280x720 instead 1920x1080. The display area is partially out of the monitor size, so that the panel is not visible and lastly the quality of the image was really bad (like insufficient frequency or sync or whatever)
I switched back to the DVI cable and I am wondering if someone can point me to the right direction.
IME, most manufacturers of HDMI switches are incapable of making them work correctly - unless they do NOT include and automatic switching mode. Apparently they think everyone who uses them turns HDMI devices off when not in use (selected as the output by the switch).
The only one I've ever encountered that works reliably has no automatic switching function and is a long ago discontinued model.
Other than returning the switch as "defective", I can only think to suggest two things:
1-power off all HDMI sources except the one you wish selected, then cycle the power to the switch.
2-manually configure Xorg using xorg.conf to exclude possible modes except 1920x1080. (Set PreferredMode, and set HorizSync and VertRefresh to narrow ranges that can only compute to the 1920x1080 mode published in the manual or provided by EDID when connected without the switch inline).
IMO I need to set the physical size in xorg.conf, but your comment reminds me to check the EDID. I wonder if the monitor can talk to the PC at all
regards
deloptes composed on 2018-05-16 07:01 (UTC+0200):
Felix Miata wrote:
digitus 4K HDMI switch 4x1
What model is that switch?
Felix, I wonder sometimes if you really read the posts. I said it is "digitus 4K HDMI switch 4x1" - you ask what model.
What you wrote looks like a description, not a model number. Model numbers are generally required to ensure a item found is the item described, necessary to ensure one does not make the mistake of choosing to acquire that exact same badly behaving item.
2-manually configure Xorg using xorg.conf to exclude possible modes except 1920x1080. (Set PreferredMode, and set HorizSync and VertRefresh to narrow ranges that can only compute to the 1920x1080 mode published in the manual or provided by EDID when connected without the switch inline).
IMO I need to set the physical size in xorg.conf, but your comment reminds me to check the EDID. I wonder if the monitor can talk to the PC at all
DisplaySize affects logical display density, not resolution/mode.
Talk to yes. Communicate, likely the problem. HDCP implementations incorporated in HDMI are capable of causing all sorts of communication foibles which intended or otherwise comprise obstacles to both violation of protection, and proper operation.
Felix Miata wrote:
What you wrote looks like a description, not a model number. Model numbers are generally required to ensure a item found is the item described, necessary to ensure one does not make the mistake of choosing to acquire that exact same badly behaving item.
DS-54303 https://www.digitus.info/en/products/computer-accessories-and-components/mon...
I will try to connect the PC directly to the monitor via HDMI and see if it makes difference to probably exclude the HDMI switch. But it can't happen today.
regards
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deloptes -
Felix Miata