I believe you can get this behaviour by setting the scaling mode property to full. This should be possible with xrandr, or directly via the kms api. It defaults to no scaling for external screens, as those usually have better scalers built in.

On Apr 4, 2016 10:44 AM, <bugzilla-daemon@freedesktop.org> wrote:
Bug ID 94817
Summary Nearest neighbor scaling?
Product xorg
Version unspecified
Hardware Other
OS All
Status NEW
Severity enhancement
Priority medium
Component Driver/nouveau
Assignee nouveau@lists.freedesktop.org
Reporter nw9165-3201@yahoo.com
QA Contact xorg-team@lists.x.org

Hello,

would it be possible that you add a nearest-neighbor scaling mode to the
driver, so that one could display 1920x1080 natively on a 3840x2160 monitor or
1280x720 natively on a 2560x1440 monitor and so on (one pixel becomes four
pixels)?

There is some information on this topic over there:

https://forums.geforce.com/default/topic/844905/geforce-drivers/integer-scaling-mode/

Regards


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