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I followed the steps at the link below to remove the proprietary driver and install the Radeon open source driver.

RadeonDriver - Community Ubuntu Documentation

However, now I notice that when I'm editing text (such as in this website) if I delete lines a few adjacent lines may completely disappear until I scroll or edit again. This bothers me enough that I need to make a change. Should I go back to the proprietary driver?

I'm running Kubuntu 12.04 with a Radeon HD 6750 card and 3 monitors (one at 2560x1600 resolution and the other 2 at 1920 x 1200). Maybe that is too much for the open source driver?


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what web browser are you using? – cas Sep 21 '13 at 1:40
I'm using Firefox. Firefox was fine before I changed video drivers from fglrx to radeon open source. – MountainX Sep 21 '13 at 1:44
I'd switch back then. – slm Sep 21 '13 at 1:45
whether you switch back to fglrx or not, i'd still recommend disabling smooth-scrolling and hw acceleration - in my experience, they're nothing but trouble. – cas Sep 21 '13 at 1:47
That's interesting. I have both of those enabled (and those have been my settings for a long time). I will try disabling them before I switch drivers. Thanks – MountainX Sep 21 '13 at 1:50

If you are using Firefox (aka Iceweasel), try disabling autoscrolling, smooth scrolling and hardware acceleration.

You can do that in: Edit Menu -> Preferences -> Advanced Tab -> General

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The "Check my spelling as I type" option is also a performance hit. I have all four options under "Browsing" disabled. – cas Sep 21 '13 at 1:52
up vote 0 down vote accepted

I switched back to the proprietary fglrx driver. I notice several things:

  1. The Firefox text editing bug is gone.
  2. In general usage application windows open a lot faster.
  3. KDE 4.11.1 has a minor bug with the fglrx driver that will be fixed in the next point release: window side borders are not drawn at first (but appear after a focus change).

I could not tolerate the Firefox text editing bug or the general slowness with the open source radeon driver, so I switched back to the fglrx driver even though I would prefer the open source driver in ideal circumstances.

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