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Message #28754
[Bug 1374785] Re: Screen-saver fade-to-black does not cover entire screen on HiDPI
** Changed in: unity
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1374785
Title:
Screen-saver fade-to-black does not cover entire screen on HiDPI
Status in Unity:
Fix Released
Status in Unity 7.2 series:
In Progress
Status in unity package in Ubuntu:
Fix Released
Status in unity source package in Trusty:
Fix Released
Bug description:
[ Impact ]
When display scaling is set to 2x or greater the fade-to-black
animation when the screen saver is invoked covers only a fraction of
the screen.
[ Test Case ]
Requires a display with 2x UI scaling (works best with a high-DPI
display).
The fade-to-black which occurs prior to the screen shutting off only
covers the top left quarter of the screen.
When scaling is set to 1x, the entire screen fades to black.
[ Regression Potential ]
An invalid scaling calculation (or rounding error) could result in writing outside the screen buffer bounds with resulting unknown impact. Inpspection and code review shows this not to be the case wit this patch.
[ Other Info ]
The Ubuntu 14.04 LTS SRU was cherry-picked from upstream Unity where
it has been in production use in Ubuntu 'Vivid Vervet' for some time
and has not shown ergressions.
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References