How does Windows 10 guess physical dimensions of a 1080p display?












0















I'm running Windows 10 1803 on a laptop, attached to a desktop display. Laptop's display resolution is same as the attached display, 1920x1080 pixel (namely "Full HD").

However the screen sizes differ, the laptop has a 13" display and the desktop display is 27"...



By the settings option: start->system->display I can adjust scaling for each (!) display to the lowest scaling factor "100%" and a highest resolution of FullHD (1080p).

This setting is fine for the laptop display.

However, with the same setting for the 27" everything appears double sized ...



Q1: How does Windows 10 guess the (physical) dimensions of a screen display to get dpi be calculated "per inch"?



Q2: Is there any option to let Windows 10 to render a "virtual" screen resolution higher than the physical maximum on the 27" display - compare Is there a registry hack to set virtual display resolution in Windows 10 1803?



Q3: Why does Windows 10 ignore the registry dword HKEY_CURRENT_USERControl PanelDesktopLogPixels, when I set the value from initial 96ppi to a higher resolution - compare Freeze Windows 10 scaling factor to 100% with Win8DpiScaling=1



Remark: Since I do not work on a stationary desktop, buying a 4k display is definitely no option and no answer to this topic.

However, using 2k+ displays would solve the problem since Windows will then calculate a reasonable dpi resolution for the attached displays.










share|improve this question

























  • A1: There is nothing to guess. Hardware has this info stored somewhere, and windows simply retrieves it. A2 and A3: Please limit your question to 1 question. Post separate questions, unless they are very related, which in this case they are not.

    – LPChip
    Dec 29 '18 at 13:18













  • Q2 moved to superuser.com/q/1388869/784695

    – Max
    Dec 30 '18 at 1:00











  • Q3 moved to superuser.com/q/1388734/784695

    – Max
    Dec 30 '18 at 1:01
















0















I'm running Windows 10 1803 on a laptop, attached to a desktop display. Laptop's display resolution is same as the attached display, 1920x1080 pixel (namely "Full HD").

However the screen sizes differ, the laptop has a 13" display and the desktop display is 27"...



By the settings option: start->system->display I can adjust scaling for each (!) display to the lowest scaling factor "100%" and a highest resolution of FullHD (1080p).

This setting is fine for the laptop display.

However, with the same setting for the 27" everything appears double sized ...



Q1: How does Windows 10 guess the (physical) dimensions of a screen display to get dpi be calculated "per inch"?



Q2: Is there any option to let Windows 10 to render a "virtual" screen resolution higher than the physical maximum on the 27" display - compare Is there a registry hack to set virtual display resolution in Windows 10 1803?



Q3: Why does Windows 10 ignore the registry dword HKEY_CURRENT_USERControl PanelDesktopLogPixels, when I set the value from initial 96ppi to a higher resolution - compare Freeze Windows 10 scaling factor to 100% with Win8DpiScaling=1



Remark: Since I do not work on a stationary desktop, buying a 4k display is definitely no option and no answer to this topic.

However, using 2k+ displays would solve the problem since Windows will then calculate a reasonable dpi resolution for the attached displays.










share|improve this question

























  • A1: There is nothing to guess. Hardware has this info stored somewhere, and windows simply retrieves it. A2 and A3: Please limit your question to 1 question. Post separate questions, unless they are very related, which in this case they are not.

    – LPChip
    Dec 29 '18 at 13:18













  • Q2 moved to superuser.com/q/1388869/784695

    – Max
    Dec 30 '18 at 1:00











  • Q3 moved to superuser.com/q/1388734/784695

    – Max
    Dec 30 '18 at 1:01














0












0








0








I'm running Windows 10 1803 on a laptop, attached to a desktop display. Laptop's display resolution is same as the attached display, 1920x1080 pixel (namely "Full HD").

However the screen sizes differ, the laptop has a 13" display and the desktop display is 27"...



By the settings option: start->system->display I can adjust scaling for each (!) display to the lowest scaling factor "100%" and a highest resolution of FullHD (1080p).

This setting is fine for the laptop display.

However, with the same setting for the 27" everything appears double sized ...



Q1: How does Windows 10 guess the (physical) dimensions of a screen display to get dpi be calculated "per inch"?



Q2: Is there any option to let Windows 10 to render a "virtual" screen resolution higher than the physical maximum on the 27" display - compare Is there a registry hack to set virtual display resolution in Windows 10 1803?



Q3: Why does Windows 10 ignore the registry dword HKEY_CURRENT_USERControl PanelDesktopLogPixels, when I set the value from initial 96ppi to a higher resolution - compare Freeze Windows 10 scaling factor to 100% with Win8DpiScaling=1



Remark: Since I do not work on a stationary desktop, buying a 4k display is definitely no option and no answer to this topic.

However, using 2k+ displays would solve the problem since Windows will then calculate a reasonable dpi resolution for the attached displays.










share|improve this question
















I'm running Windows 10 1803 on a laptop, attached to a desktop display. Laptop's display resolution is same as the attached display, 1920x1080 pixel (namely "Full HD").

However the screen sizes differ, the laptop has a 13" display and the desktop display is 27"...



By the settings option: start->system->display I can adjust scaling for each (!) display to the lowest scaling factor "100%" and a highest resolution of FullHD (1080p).

This setting is fine for the laptop display.

However, with the same setting for the 27" everything appears double sized ...



Q1: How does Windows 10 guess the (physical) dimensions of a screen display to get dpi be calculated "per inch"?



Q2: Is there any option to let Windows 10 to render a "virtual" screen resolution higher than the physical maximum on the 27" display - compare Is there a registry hack to set virtual display resolution in Windows 10 1803?



Q3: Why does Windows 10 ignore the registry dword HKEY_CURRENT_USERControl PanelDesktopLogPixels, when I set the value from initial 96ppi to a higher resolution - compare Freeze Windows 10 scaling factor to 100% with Win8DpiScaling=1



Remark: Since I do not work on a stationary desktop, buying a 4k display is definitely no option and no answer to this topic.

However, using 2k+ displays would solve the problem since Windows will then calculate a reasonable dpi resolution for the attached displays.







windows-10 windows-registry






share|improve this question















share|improve this question













share|improve this question




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edited Dec 30 '18 at 1:05







Max

















asked Dec 29 '18 at 12:18









MaxMax

1013




1013













  • A1: There is nothing to guess. Hardware has this info stored somewhere, and windows simply retrieves it. A2 and A3: Please limit your question to 1 question. Post separate questions, unless they are very related, which in this case they are not.

    – LPChip
    Dec 29 '18 at 13:18













  • Q2 moved to superuser.com/q/1388869/784695

    – Max
    Dec 30 '18 at 1:00











  • Q3 moved to superuser.com/q/1388734/784695

    – Max
    Dec 30 '18 at 1:01



















  • A1: There is nothing to guess. Hardware has this info stored somewhere, and windows simply retrieves it. A2 and A3: Please limit your question to 1 question. Post separate questions, unless they are very related, which in this case they are not.

    – LPChip
    Dec 29 '18 at 13:18













  • Q2 moved to superuser.com/q/1388869/784695

    – Max
    Dec 30 '18 at 1:00











  • Q3 moved to superuser.com/q/1388734/784695

    – Max
    Dec 30 '18 at 1:01

















A1: There is nothing to guess. Hardware has this info stored somewhere, and windows simply retrieves it. A2 and A3: Please limit your question to 1 question. Post separate questions, unless they are very related, which in this case they are not.

– LPChip
Dec 29 '18 at 13:18







A1: There is nothing to guess. Hardware has this info stored somewhere, and windows simply retrieves it. A2 and A3: Please limit your question to 1 question. Post separate questions, unless they are very related, which in this case they are not.

– LPChip
Dec 29 '18 at 13:18















Q2 moved to superuser.com/q/1388869/784695

– Max
Dec 30 '18 at 1:00





Q2 moved to superuser.com/q/1388869/784695

– Max
Dec 30 '18 at 1:00













Q3 moved to superuser.com/q/1388734/784695

– Max
Dec 30 '18 at 1:01





Q3 moved to superuser.com/q/1388734/784695

– Max
Dec 30 '18 at 1:01










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