Calibre doesn't seem to support 125% scaling

davidhcje · 03-08-2021, 07:26 AM

Background & Settings
I'm using windows 10 and I have two monitors with different resolutions and scaling:

A: 1440p with 150% scaling factor
B: 1080P with 125% scaling factor

I keep this setting to default: preferences > look & feel > main interface > adjust for high resolution screen: automatic.

Problem
All Calibre windows (main window, viewer, editor, preferences, etc.) show different scales on two monitors, larger on the 150% scaling screen, and smaller on the 125% scaling screen.

Possible reason
I made some experiments and found that Calibre doesn't support 125% scaling factor, as it treats a 125% screen same as 100%.

Suggestion
I'm propose a new feature, making Calibre support 125% scaling factor, in a future release.

kovidgoyal · 03-08-2021, 08:15 AM

calibre doesnt do scaling, Qt the graphics toolkit calibre uses does. You will need to add support for it there, not in calibre.

davidhcje · 03-10-2021, 04:15 AM

Got it. Thank you!

mblrdr · 05-11-2024, 03:12 AM

Switching between Paged mode and Flow mode is not possible via either Settings nor via shortcut (ctrl+m) when Windows scaling is 150%. On 125% scaling everything is fine.

Monitor 2560x1440, Calibre 7.8, Win10

Guess that's not a QT bug but a bug in calibre itself then.

kovidgoyal · 05-11-2024, 03:15 AM

Works fine for me at 125% and 150%

JSWolf · 05-11-2024, 05:41 AM

Quote:

Originally Posted by mblrdr

Switching between Paged mode and Flow mode is not possible via either Settings nor via shortcut (ctrl+m) when Windows scaling is 150%. On 125% scaling everything is fine.

Monitor 2560x1440, Calibre 7.8, Win10

Guess that's not a QT bug but a bug in calibre itself then.

My laptop screen is 2560x1440 and I have Windows 11 at 125% scale. All versions of calibre 7 work without a problem.

Quoth · 05-11-2024, 08:28 AM

Also with external 2560x1440 16″ USB-C/HDMI screen on Linux Mint on Laptop or Raspberry Pi4b Ubuntu the Calibre is fine.

03-08-2021, 07:26 AM	#1
davidhcje Connoisseur Posts: 75 Karma: 10 Join Date: Mar 2021 Device: android phone	Calibre doesn't seem to support 125% scaling Background & Settings I'm using windows 10 and I have two monitors with different resolutions and scaling: A: 1440p with 150% scaling factor B: 1080P with 125% scaling factor I keep this setting to default: preferences > look & feel > main interface > adjust for high resolution screen: automatic. Problem All Calibre windows (main window, viewer, editor, preferences, etc.) show different scales on two monitors, larger on the 150% scaling screen, and smaller on the 125% scaling screen. Possible reason I made some experiments and found that Calibre doesn't support 125% scaling factor, as it treats a 125% screen same as 100%. Suggestion I'm propose a new feature, making Calibre support 125% scaling factor, in a future release.

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03-08-2021, 08:15 AM	#2
kovidgoyal creator of calibre Posts: 43,963 Karma: 22669822 Join Date: Oct 2006 Location: Mumbai, India Device: Various	calibre doesnt do scaling, Qt the graphics toolkit calibre uses does. You will need to add support for it there, not in calibre.

03-10-2021, 04:15 AM	#3
davidhcje Connoisseur Posts: 75 Karma: 10 Join Date: Mar 2021 Device: android phone	Got it. Thank you!

05-11-2024, 03:12 AM	#4
mblrdr Enthusiast Posts: 29 Karma: 10 Join Date: Feb 2022 Device: none	Switching between Paged mode and Flow mode is not possible via either Settings nor via shortcut (ctrl+m) when Windows scaling is 150%. On 125% scaling everything is fine. Monitor 2560x1440, Calibre 7.8, Win10 Guess that's not a QT bug but a bug in calibre itself then.

05-11-2024, 03:15 AM	#5
kovidgoyal creator of calibre Posts: 43,963 Karma: 22669822 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Works fine for me at 125% and 150%

05-11-2024, 08:28 AM	#7
Quoth the rook, bossing Never. Posts: 11,437 Karma: 87454321 Join Date: Jun 2017 Location: Ireland Device: All 4 Kinds: epub eink, Kindle, android eink, NxtPaper11	Also with external 2560x1440 16″ USB-C/HDMI screen on Linux Mint on Laptop or Raspberry Pi4b Ubuntu the Calibre is fine.