722148 - Disabling hardware acceleration causes tearing when scrolling site with scrollbar

Status: VERIFIED DUPLICATE of bug 700867

(Core :: Graphics, defect)

Description

[Virtual_ManPL [:Virtual] 🇵🇱 - (please needinfo? me - so I will see your comment/reply/question/etc.)]

Disabling "Use hardware acceleration when available " in "Options=>Advanced=>General" causes tearing on the websites.
Simply catch with mouse a scrollbar and move it down and up, not too fast and also not to slow to get page readable to get the tearing.

GPU info from about:config

Graphics
Adapter Description - NVIDIA GeForce GTX 460 v2
Vendor ID - 0x10de
Device ID - 0x1205
Adapter RAM - 1024
Adapter Drivers - nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um
Driver Version - 8.17.12.9053
Driver Date - 12-17-2011
Direct2D Enabled - false
DirectWrite Enabled - false (6.1.7601.17563)
ClearType Parameters - ClearType parameters not found
WebGL Renderer - Google Inc. -- ANGLE (NVIDIA GeForce GTX 460 v2) -- OpenGL ES 2.0 (ANGLE 1.0.0.963)
GPU Accelerated Windows - 0

Comment 1

[CruNcher]

even with over 20 tabs loaded @ once i cant confirm it on Aero with Intel HD Graphics 2000 (Intel SB), it just hangs in intervals but that's most probably something in the Javascript GC Engine stalling it though these Scrolling issues are very known problems compared to Chromeiums Hardware Accelleration Engine they're some Performance issues though they're even more visible on heavier pages with lots of Graphics trying to be scrolled or Videos Playing back interferences in Firefox with Multimedia Content are imho a major issue that Google perfectly solved in Chrome ( not 1 drop anytime when watching Video content Windowed) :(
See also my own Bug Report though with Hardware acceleration on 
https://bugzilla.mozilla.org/show_bug.cgi?id=702485 and look @ the Video i also made a Video comparing the Scrolling of Firefox vs Googles Hardware Engine to show how smooth Google does it even pictures in the scroll state keep very perceptible visible where in Firefox they fall apart and can't be recognized anymore i might issue this as a Performance bug also soon as i saw no improvement going on, though i wouldn't call this a critical issue @ least not the scrolling quality, though in terms of Snappy going on it should have been a part of it.

Comment 2

[Virtual_ManPL [:Virtual] 🇵🇱 - (please needinfo? me - so I will see your comment/reply/question/etc.)]

Some more testing and
Firefox Portable 6.0.2 (32bit) = no tearing
Firefox Portable 7.0.1 (32bit) = tearing

I will try now to find the regression range

Comment 3

[Virtual_ManPL [:Virtual] 🇵🇱 - (please needinfo? me - so I will see your comment/reply/question/etc.)]

OK, I find it :)

unaffected:
https://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/2011/05/2011-05-30-03-mozilla-central/

bugged:
https://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/2011/05/2011-05-31-03-mozilla-central/

changelog:
https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=e8ee43fcbce8&tochange=7a8ebf42265a

Comment 4

[Virtual_ManPL [:Virtual] 🇵🇱 - (please needinfo? me - so I will see your comment/reply/question/etc.)]

bumping