|01 Jun 2013||#1|
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"Color ringing" on text, ATI video card, only with Firefox
This problem in Firefox started around the time of the V13 video drivers for ATI HD* video cards (I have an HD4850 running v13.1 and an HD5770 running v13.4). Or, it might have been around the time v20 of Firefox came out (I'm currently using v21.0). Don't know exactly.
So the problem may be tied to v13 of the ATI video drivers, or it might be to a recent version of Firefox. Unclear. Since the issue does not show up with Internet Explorer but only with Firefox, I decided to post the question here rather than in the Video sub-forum.
Anyway the problem is that text displayed or in a composition window (like this, as I write) often seems to "vibrate" with colors around the letters. Kind of like a "video convergence" problem on an old CRT, where the RGB guns were not all focused on the same spot.
Seems that scrolling the page up or down can often cure the problem (as the screen is re-painted), or most often it just kind of disappears on its own after a while, for some reason.
Anybody else notice this?
Here's what it looks like. Amazingly I was able to get a screenshot before the "color ringing" disappeared and everything was once again perfect black text.
|My System Specs|
|01 Jun 2013||#2|
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Well, whoever the culprit is... either (a) ATI Catalyst v13.1 or higher, or (b) Firefox v20 or higher... the "workaround" seems to be to TURN OFF HARDWARE ACCELERATION IN FIREFOX.
Tools -> Options -> Advanced -> General tab, and then un-check "use hardware acceleration" item in the Browsing group.
That definitely eliminates the symptom.
But it also has the undesirable (for me, anyway) effect of eliminating all of the benefits of hardware acceleration! And in particular, on SevenForums because of the forum software and the method of presenting text in posts, when hardware acceleration is disabled the text lines in posts have a horizontally closer together character spacing, and also a vertically closer together line spacing. This makes it slightly "denser" than when hardware acceleration is enabled and things have a slightly larger horizontal and vertical spacing for the identical text.
I went through a similar story last year when Firefox blacklisted Catalyst 12.8, automatically disabling hardware acceleration because of instability issues. I had to go back to Catalyst 12.6 to be able to retain hardware acceleration, at least until ATI resolved the driver issue in 12.10.
So for now, at least I understand that I'm not crazy, and that there's nothing really wrong with my systems.
The problem is definitely software somewhere, either in Catalyst or in Firefox, but obviously it's a relatively new software problem. And hopefully it will eventually go away as one or the other software vendors corrects something which is at the heart of the problem.
In the meantime, I'll "live with it" (annoying as it is) since it kind of generally self-disappears as I scroll pages up and down, which is "good enough" for me. I prefer how things look on this forum with hardware acceleration enabled, so that's the biggest influence for this decision.
|My System Specs|
|01 Jun 2013||#3|
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New information on this problem, as learned from the MozillaZine forum in response to my thread there.
Turns out this is a known problem and was "born" due to Windows 7 Platform Update KB2670838 (MSIE 10 Prerequisite), a Microsoft update for IE 10 as documented in this Firefox bug report.
And it turns out there is a "better" solution/workaround for this, other than disabling Hardware Acceleration. Turns out if you instead disable support for Azure content this will accomplish the desired result and the "color fringing/ringing" symptom will disappear. So you can keep hardware acceleration, by disabling Azure.
In the address bar enter: about:config
look for pref: gfx.content.azure.enabled double-click to toggle the setting, and restart the browser.
This should fix it for you. Did for me.
Note: the problem is specific to Firefox, not to IE (not surprisingly).
|My System Specs|
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