Hi. I'm getting strange vertical lines appearing in text. See the attached screenshot. I've only seen it in OpenOffice (for a long time now) and the CrossOver Office version of Wine (just once but I don't use it much). It tends to affect certain letters like 'r' but you can also see it affecting some other letters in the screenshot. The problem goes away when I set RenderAccel to false so that must be where the problem lies. It's probably also worth mentioning that X seems that little bit faster when RenderAccel is set to false. Is that because of this bug? And does the fact that the Radeon driver cannot do accelerated subpixel rendering have anything to do with it? I have subpixel rendering enabled in my fontconfig. I'm using Xorg 7.0.0 with 20051223 CVS snapshots of Mesa and the DRM modules. I have a Radeon IGP345M.
Created attachment 4333 [details] Screenshot of vertical lines
Yes! Me too! Actually I get other many random corruptions with my IGP340M (HP notebook). What I've discovered so far is that there seems to be a major b0rkage of the RenderAccel code, at least on this board. Configurations I've tested: - EXA+RenderAccel: visualization is fine in 24bit mode, but there are major performance drops. Even without shadows and transparent windows. Scrolling large webpages in konqueror & firefox hogs the system down, and after a while overall performance starts to suck (especially when switching workspaces). In 16 bit mode it is a tiny bit faster, but I get the same corruptions as you. Anti-aliased text does not make any appreciable difference. - EXA+NoRenderAccel: it is WAY faster! Scrolling pages in web-browsers is on-par with XAA (i.e. blazingly fast). Of course shadows and especially transparencies are slower due to lack of acceleration, but I can live with that. At least xcompmgr -a is now usable ;) After a while performance drop a bit, but nothing compared to the previous case (I understand this may be and issue with EXA memory management Eric Anholt is tackling). - XAA+RenderAccel: speed is ok, but I get strange corruptions near anti-aliased text. For example with some letters there is a "smear" effect, which overlaps with nearby characters. And in konsole with white background sometimes pale grey lines appears over and below text. If text is not anti-aliased there are no corruptions. - XAA+NoRanderAccel: visually everything is ok. Most usable configuration as of now. So to summarize the issue seems strictly connected to RenderAccel, regardless of the acceleration method used. Can anyone look into this please?
Oh, some missing info. lspci: 01:05.0 VGA compatible controller: ATI Technologies Inc Radeon IGP 330M/340M/350M Xorg is modular 7.0, but the problem is there since a long time (at least 6.8).
I had a similar problem, see https://bugs.freedesktop.org/show_bug.cgi?id=1424 I'm still appling the latest patch made by Kevin E. Martin here, on gentoo xorg 7.0 (xf86-video-ati 6.5.7.3) but I'm using only exa
(In reply to comment #4) > I had a similar problem, see https://bugs.freedesktop.org/show_bug.cgi?id=1424 The screenshot certainly looks like this. James, if you agree, please resolve this as a duplicate of bug 1424. > I'm still appling the latest patch made by Kevin E. Martin here, on gentoo xorg > 7.0 (xf86-video-ati 6.5.7.3) but I'm using only exa The patches from that bug don't have any effect with EXA though.
I couldn't say for sure. I haven't seen anything like the first screenshot and I don't think I've seen it affect 'i' the way it has in the third screenshot. The 'R' in the third screenshot, however, is exactly what I get.
Yeah, the/one trouble with that bug is that it refers to at least two separate issues... what a mess.
Marking broken (status null/blank) bugs in xorg with no activity in a long time as fixed. Please reopen if you think it's necessary, but first do a search if a similar bug report is already filed and in a NEW/ASSIGNED state. These bugs do not currently show in most search results as they do not have any status. Sorry for this janitorial spam, you know where to send hate mails to when your inbox gets full of bugs you're subscribed to.
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