Created attachment 102687 [details] xorg.log When selecting RGB subpixel font antialising on my mothers laptop (Geforce 488Go / NV18) icons are suddenly misrendered (see screenshot) Tried several options such as NoUploadTo/DowloadFromScreen, MigrationHeuristics smart/greedy, agpmode=0 - however only disabling render acceleration completely did help. The notebook is running Fedora-20 + latest updates (linux-3.15.4), the issue happends with nouveau 1.0.9 as well as nouveau git from 20140713. - Clemens PS: It is incredible how well nouveau performs for 2D operations these days, thanks for working on improving this area over the past years.
Created attachment 102688 [details] screenshot of icons rendered white
There have been a few reports of things not being drawn on NV1x, but no one ever narrowed it down to anything, and I could never reproduce. I wonder if some sort of alpha setting isn't actually supported and so things are being drawn with alpha=0 or something. If you're a developer, can you debug this a bit? Take a look at src/nv10_exa.c (in the ddx)... the function that determines if something will be accelerated is NV10EXACheckComposite. Start by just returning FALSE unconditionally there and make sure the problem is 'fixed'. (If it isn't, the issue is something else.) Assuming it's fine, try printing the requests that are making it through and try to identify the ones that aren't being handled properly (by selectively returning false for some of them).
> If you're a developer, can you debug this a bit? Unfourtunately I am not a driver developer, however I can play a bit arround and see how things change. > There have been a few reports of things not being drawn on NV1x, Interesting you mention missing things, because when I go with grayscale antialising I can see missing text on the desktop icons. I didn't mention it, because I guess it is really hard to reproduce. > I wonder if some sort of alpha setting isn't actually supported > and so things are being drawn with alpha=0 or something. However, shouldn't this just affect the glyphs rendered? The blending mode of the icons doesn't change, so it seems some state is garbled after the glyphs were rendered, leading to those misrendered icons.
I just sent a bunch of patches to the list... two of the patches are no-ops, but these two actually change functionality: http://lists.freedesktop.org/archives/nouveau/2014-August/018270.html http://lists.freedesktop.org/archives/nouveau/2014-August/018271.html please see if applying these fixes the issue for you.
The two patches fix both issues - the icon corruption when RGB font hinting is activated, as well as somtimes missing text with greyscale antialiasing :) This makes my old laptop a fully functional email/browsing machine again - thanks!
Awesome! These patches should be in xf86-video-nouveau git now. A release is going to be forthcoming once a couple of issues are ironed out.
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