Created attachment 8643620 [details] Captured behaviour User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:39.0) Gecko/20100101 Firefox/39.0 Build ID: 20150629114848 Steps to reproduce: Clicked and dragged the horizontal scrollbar. Actual results: Content with overflow: auto got blurred (long coloured lines per line). Expected results: Just see the rest of the content.
P.S.: Example of this behaviour on https://www.eduid.cz/cs/tech/sp/shibb-2.4
More info - tested on: - Ubuntu 14.04 LTS (64bit), Firefox 39.0 - described behaviour - Windows 7 (64bit), Firefox 39.0 - normal/expected behaviour I've tried also to make new firefox profile - still the same on Ubuntu, so it is probably really Firefox problem.
Created attachment 8643741 [details] video.webm I converted your mp4 to webm because the file was not readable.
I'm not able to reproduce the issue with FF39 on Win 7, I tried with HWA on/off, no issue. Can you type about:support in the location bar and copy here the section "graphics", please.
Component: Untriaged → Graphics
Product: Firefox → Core
But I wrote that on Win7 it has normal/expected behaviour (=> that means no problem). It makes described on Ubuntu.
(In reply to dakur from comment #5) > But I wrote that on Win7 it has normal/expected behaviour (=> that means no > problem). It makes described on Ubuntu. We still need a copy of about:support from your Firefox profile on Ubuntu.
Created attachment 8643947 [details] about_support-export-as-data.json Adding about:support information. Now I reproduced the same error on another Ubuntu machine (same Ubuntu and Firefox version).
Can you please check if this happens with the latest Firefox Nightly from https://nightly.mozilla.org/?
I've tested it and it looks like it works correctly.
Thanks, with Firefox 39, are you using our build or the one Canonical ships?
Canonical, the default preinstalled one.
OS: Unspecified → Linux
Hardware: Unspecified → x86_64
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