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Old 03-08-2021, 07:26 AM   #1
davidhcje
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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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Old 03-08-2021, 08:15 AM   #2
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calibre doesnt do scaling, Qt the graphics toolkit calibre uses does. You will need to add support for it there, not in calibre.
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Old 03-10-2021, 04:15 AM   #3
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Got it. Thank you!
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Old 05-11-2024, 03:12 AM   #4
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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.
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Old 05-11-2024, 03:15 AM   #5
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Works fine for me at 125% and 150%
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Old 05-11-2024, 05:41 AM   #6
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Quote:
Originally Posted by mblrdr View Post
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.
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Old 05-11-2024, 08:28 AM   #7
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Also with external 2560x1440 16″ USB-C/HDMI screen on Linux Mint on Laptop or Raspberry Pi4b Ubuntu the Calibre is fine.
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Old Today, 06:19 AM   #8
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Quote:
Originally Posted by JSWolf View Post
My laptop screen is 2560x1440 and I have Windows 11 at 125% scale. All versions of calibre 7 work without a problem.
Could you try 150%? And then try to switch?
Thx
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Old Today, 06:31 AM   #9
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Quote:
Originally Posted by mblrdr View Post
Could you try 150%? And then try to switch?
Thx
The problem could be that you are using two different scaling amounts. I suggest trying 125% or 150% on both monitors.
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Old Today, 07:47 AM   #10
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Quote:
Originally Posted by JSWolf View Post
The problem could be that you are using two different scaling amounts. I suggest trying 125% or 150% on both monitors.
Single ThinkPad here (no external monitors). Just updated to newest Intel HD driver. Problem still there.
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Old Today, 08:41 AM   #11
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Odd. I'm using a Thinkpad connected to it's internal display and an external display both with 125% scaling and I'm seeing no issues (the internal is using the Intel driver, the external uses the NVidia driver).
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Old Today, 09:34 AM   #12
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As a last resort, I suggest disabling Qt scaling and see if that helps

see https://www.mobileread.com/forums/sh...d.php?t=348475

and

https://www.mobileread.com/forums/sh...d.php?t=351959
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