1722007 - Scaling on high DPI screen broken

Status: RESOLVED INCOMPLETE

(Core :: Graphics: WebRender, defect, P3)

Description

[markus.snasel]

Attachment: firefox_scaling_bug.png

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:90.0) Gecko/20100101 Firefox/90.0

Steps to reproduce:

I used Firefox casually.

I use Windows10 and a 4k Monitor + an older 1920x1080.

Actual results:

Scaling on some Elements is way off. (see Screenshots)

This phenomenon is same on both screens.

Expected results:

Text and and other Elements should scale accordingly.

Comment 1

[markus.snasel]

This has never been an issue and started recently. I did not make changes to my workstation, so the issue comes from either a Firefox or Windows update.

I tried changing High DPI Scaling override in Windows Compatibility settings without success.

Right Click Shortcut -> Properties -> Compatibility -> Change high DPI settings -> High DPI scaling override
-> Application: scaling is kind of ok with this setting, but everything is way to large on the low resolution screen
-> System: everything gets blurry, text is very low resolution

I will use the application scaling for now, but hope this gets resolved.

Comment 2

[markus.snasel]

You can close this issue!
Apparently this was only temporary and after restarting my PC the problem was fixed.

Will post update if I encounter this issue again.

Comment 3

[markus.snasel]

Happened again after some browsing. No idea what might cause it. Restarting my PC fixes the issue.

Comment 4

[Clara Guerrero ( Need Info Brindusa Tot Please)]

Hi markus.snasel,
Thanks for the report!
Can you attach your about:support information please?

Could you please also answer the following questions in order to further investigate this issue?

1- Does this issue happen with a new profile? Here is a link on how to create a new profile: https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles
2- Are you using add-ons? If so could you please list them? (you can try the issue while in Safe Mode. You can find helpful info here : https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode .)
3- Does this issue occur in the latest nightly version of firefox? Here is a link from where you can download it: https://www.mozilla.org/en-US/firefox/channel/desktop/

I've assigned a component in order to get the dev team involved, but if it's not relevant, please feel free to change it to an appropriate one.
Best regards, Clara.

Comment 5

[Lee Salzman [:lsalzman]]

Can you attach your "about:support" information? I suspect this is a WebRender-related issue, but it would be good to confirm.

Comment 6

[markus.snasel]

Attachment: about:support

>!

Comment 7

[markus.snasel]

Will try nightly version, change profile and post my installed add-ons over the weekend.

I am currently not experiencing scaling issues. Apparently they are triggered by some specific action. Not sure what triggers it tough. It occurs after some browsing, and everything is fixed when I restart my PC.

Regards,
Markus

Comment 8

[markus.snasel]

Did not encounter the bug since.

Comment 9

[Glenn Watson [:gw]]

Closing based on comment 8.