DPI Data

Data collected to try to help understand Operating System DPI settings.

MS Windows

• Windows 7

Monitor specific data (the 1080p settings were tested on a different machine than the 4K).

Graphics Card	Monitors	Cables	Resolution	Vertical Refresh
AMD Radeon HD 7700 Series	ASUS VH232H	VGA-DVI	1920x1080	60
NVIDIA GeForce? GTX 970	Dell P2815Q	Display Port	3820x2160	29

• Windows 8.1

Monitor specific data (also depends on graphics card, cable, ..).

Graphics Card	Monitors	Cables	Resolution	Vertical Refresh
Intel HD Graphics 4000	Dell P2815Q	DP-Thunderbolt	3820x2160	29
Intel HD Graphics 4000	HP ZR2740w IPS	DP-Thunderbolt	2560x1440	59
Intel HD Graphics 4000	Dell P2815Q + HP ZR2740w IPS	DP-Thunderbolt + DVI-HDMI	3820x2160 + 1280x720	29

(the vertical refresh rate uses the slowest link - which makes sense)

Unless stated otherwise, the same monitor settings were used for collecting the data.

Cursor Size

In all tested versions of MS Windows, the cursor size can be derived from the DPI setting:

Text Size	dpi	cursor_size
100% (Smallest)	96	32
125%	120	32
150%	144	48
200%	192	64
250%	240	64

• Windows 7 (1080p) with ​SetProcessDPIAware enabled. (XPRA_DPI_AWARE=1 - which is the default)

Data collected using Native_gui.exe.

Text Size	dpi	window_frame.caption	window_frame.frame	window_frame.menu-bar	window_frame.minimum	window_frame.normal	window_frame.offset
100% (Smallest)	96	22	8, 8, 30, 8	20	132, 38	8, 8	8, 30
125%	120	27	9, 9, 36, 9	25	158, 45	9, 9	9, 36
150%	144	33	11, 11, 44, 11	30	194, 55	11, 11	11, 44

• Windows 7 with Dell 4k display.

Text Size	dpi	window_frame.caption	window_frame.frame	window_frame.menu-bar	window_frame.minimum	window_frame.normal	window_frame.offset
100% (Smallest)	96	22	8, 8, 30, 8	20	116, 38	8, 8	8, 30
125%	120	28	9, 9, 37, 9	28	171, 46	9, 9	9, 37
150%	144	33	11, 11, 44, 11	33	202, 55	11, 11	11, 44
200%	192	54	13, 13, 67, 13	54	293, 80	13, 13	13, 67
250%	240	70	16, 16, 86, 16	70	376, 102	16, 16	16, 86

• Windows 8.1 with ​SetProcessDPIAware enabled. (XPRA_DPI_AWARE=1 - which is the default)

Data collected using Native_gui.exe.

Text Size	dpi	window_frame.caption	window_frame.frame	window_frame.menu-bar	window_frame.minimum	window_frame.normal	window_frame.offset
100% (Smallest)	96	23	8, 8, 31, 8	20	140, 39	8, 8	8, 31
125%	120	29	9, 9, 38, 9	25	178, 47	9, 9	9, 38
150%	144	34	11, 11, 45, 11	30	210, 56	11, 11	11, 45
200%	192	45	13, 13, 58, 13	39	274, 71	13, 13	13, 58
250%	240	56	16, 16, 72, 16	49	340, 88	16, 16	16, 72

---

Workarea information (with the taskbar shown at the bottom of the screen) - values are teh same with windows 7 or 8.1:

• Dell P2815Q at 3840x2160:

Text Size	Total/ Detected Workarea
100%	0, 0, 3840, 2120
125%	0, 0, 3840, 2112
150%	0, 0, 3840, 2104
200%	0, 0, 3840, 2088
250%	0, 0, 3840, 2072

• HP ZR2740w IPS at 2560x1440:

Text Size	Total/ Detected Workarea
100%	0, 0, 2560, 1400
125%	0, 0, 2560, 1392
150%	0, 0, 2560, 1384
200%	0, 0, 2560, 1368
250%	n/a

• ASUS VH232H at 1920x1080:

Text Size	Total/ Detected Workarea
100%	0, 0, 1920, 1080
125%	0, 0, 1920, 1032
150%	0, 0, 1920, 1024

• Dell P2815Q at 3820x2160 & HP ZR2740x IPS at 1280x720:

Text Size	Total/ Detected Workarea	Displayed/ Detected Workarea 1	Displayed/ Detected Workarea 2	Total/ Detected Workarea with single scaling for all displays	Displayed/ Detected Workarea 1 with single scaling	Displayed/ Detected Workarea 2 with single scaling
100%	0, 0, 5120, 2120	0, 0, 3840, 2120	0, 0, 1280, 680	0, 0, 5120, 2120	0, 0, 3840, 2120	0, 0, 1280, 680
125%	0, 0, 5440, 2112	0, 0, 3840, 2112	0, 0, 1600, 840	0, 0, 5120, 2112	0, 0, 3840, 2112	0, 0, 1280, 672
150%	0, 0, 5760, 2104	0, 0, 3840, 2104	0, 0, 1920, 996	0, 0, 5120, 2104	0, 0, 3840, 2104	0, 0, 1280, 664
200%	0, 0, 6400, 2088	0, 0, 3840, 2088	0, 0, 2560, 1440	0, 0, 5120, 2088	0, 0, 3840, 2088	0, 0, 1280, 648
250%	0, 0, 7040, 2072	0, 0, 3840, 2072	0, 0, 3200, 1800	0, 0, 5120, 2072	0, 0, 3840, 2072	0, 0, 1280, 632

From this we can infer that the size of the taskbar (which reduces the available workarea) does not change with the monitor resolution, only the text size, though it is then further scaled by the factor of the desktop-scaling (these numbers apply to both windows 7 and 8.1):

Text Size	desktop-scaling	Taskbar Size
100%	100%	40
100%	125%	32
100%	150%	27
100%	200%	20
100%	300%	13
125%	100%	48
125%	125%	38
125%	150%	32
125%	200%	24
125%	300%	16
150%	100%	56
150%	125%	45
150%	150%	37
150%	200%	28
150%	300%	19
200%	100%	72
200%	125%	58
200%	150%	48
200%	200%	36
200%	300%	24
250%	100%	88
250%	125%	70
250%	150%	59
250%	200%	44
250%	300%	29