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Firefox fonts "broken" but ONLY in Secondary display (duplicate main s
I had originally thought I had a problem with Firefox, Firefox fonts suddenly "broken", but it turns out that the problem shows up only on a secondary display but not on the primary display, which is a Lenovo 730 laptop. THERE IS NO ISSUE WITH WINDOWS OR ANY OTHER APPLICATION.
Details:
System is Lenovo730, 8550U CPU, 16 GB RAM, Intel UHD 620. Secondary display is Samsung 17", installed as a generic PnP monitor. Windows 10 64 Home with all patches applied. Firefox is 86.0.1. If you read through the earlier thread above, you will see that I used DDU to clean out the old GPU driver before installing the newest GPU driver which I downloaded from the Lenovo website.
If I look at the laptop screen, all the text in Firefox tabs looks normal. However, on the secondary display, the text looks like a lot of the pixels are missing or maybe they are light gray. My wife describes the appearance as "broken fonts."
Because I just looked at the laptop primary screen today, I had assumed that I had a Firefox issue. Now it's clear that Firefox works fine, but somehow there is an issue with displaying Firefox on the secondary display.