890522 - Firefox 22.0 reset browser viewing resolution to 800 x 600 on its own.

Status: RESOLVED DUPLICATE of bug 851268

(Firefox :: Untriaged, defect)

Description

[JGStandby]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:22.0) Gecko/20100101 Firefox/22.0 (Beta/Release)
Build ID: 20130618035212

Steps to reproduce:

I am using a Toshiba laptop "Satellite C655" with HD, hi-res viewing screen set to 1366 x 768 resolution.  ACPI x64 based PC.  Processor is:  AMD E-300 APU with Radeon HD Graphics.

Windows 7, version 6.1, service pack 1.  Fully updated through July-04-2013



Actual results:

After installing FF 22.0 on a Mozilla.org update recommendation, the FF viewing screen resolution changed by itself to 800 x 600.




Expected results:

In the past, the FF viewing screen displayed at 1366 x 768.

Comment 1

[Mardeg]

Can you tell us what value appears in a tab when you paste this into the addressbar?:

data:text/html,<script>document.write(window.devicePixelRatio)</script>

Comment 3

[Greg Edwards]

This can't be 851268 since Windows won't allow 125% unless your res is at least 1280x860.

Comment 4

[Greg Edwards]

1280x960 (typo)

Comment 5

[JGStandby]

This is a new issue with my machine.

When I got it about a year ago, I
installed FF 19 or 20, I don't remember
which.  Updates have brought me now
to FF 22.0.

There was no previous issue with FF
display.  It showed at a higher resolution
than it is now.  Much smaller pixels.

Don;t know what caused the change after
this latest download...

Comment 6

[Masatoshi Kimura [:emk]]

(In reply to Greg Edwards from comment #3)
> This can't be 851268 since Windows won't allow 125% unless your res is at
> least 1280x860.

I could even set the DPI value to 200% on my 1280x800 laptop.
That said, we should consider to use the lower DPI value if the effective resolution is too low because Windows <= 8.1 will detect the monitor DPI only on the first logon.

Comment 7

[Masatoshi Kimura [:emk]]

(In reply to JGStandby from comment #5)
Did you read comment #1?

Comment 8

[JGStandby]

(In reply to Masatoshi Kimura [:emk] from comment #7)
> (In reply to JGStandby from comment #5)
> Did you read comment #1?

Yes, I did.  I responded in a straight "Comment" form, though
as I get the hang of the Bugzilla u/i, I see I should have
used the "[reply]" option.  To repeat, since the answer was
apparently not logged, the response of FF 22.0 to the
script in Comment 1 was "1.25."

HTH