User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:2.0) Gecko/20100101 Firefox/4.0 Build Identifier: Mozilla/5.0 (Windows NT 5.1; rv:2.0) Gecko/20100101 Firefox/4.0 I have a Lenovo T410. With it docked I have the laptop screen as my main screen and the screen extended to a second monitor. When Firefox is on the second monitor the scrolling becomes jerkey and slow. If I move Firefox to the laptop window the problem isn't there. I have tried other programs (Chrome, IE etc.) and none of them have this problem. I have just moved to the Lenovo and was using a Dell Latitude before with the same setup but no problem with the screen so it seems to be specific to the Lenovo. The problem is present both with smooth scrolling turned on and off. Reproducible: Always Steps to Reproduce: 1. Open Firefox 2. Put Firefox on the "extended desktop" 3. Scroll on the page Actual Results: Jerkey slow scrolling Expected Results: No delay in the scrolling
Is the Issue reproducible in Safe-Mode for you guys? https://support.mozilla.com/en-US/kb/Safe+Mode
Mozilla/5.0 (Windows NT 5.1; rv:6.0a1) Gecko/20110420 Firefox/6.0a1 Please try a clean profile also: http://support.mozilla.com/en-US/kb/Managing%20profiles Could it be related to hardware acceleration? Try disabling it and see whether you can still reproduce the issue.
The problem is not there in Safe-Mode. I haven't installed any extensions yet so that isn't the problem. I tried to go through and disable plugins (flash, etc) one by one but the problem was still there with everything disabled when not in Safe-Mode.
I tried a clean profile and turning off hardware acceleration but neither made any difference.
(In reply to comment #5) > I tried a clean profile and turning off hardware acceleration but neither > made any difference. Did you restart Firefox when disabling Hardware Accel.?
(In reply to comment #6) > (In reply to comment #5) > > I tried a clean profile and turning off hardware acceleration but neither > > made any difference. > > Did you restart Firefox when disabling Hardware Accel.? I thought I had, but apparently not. I just tried again and turning off hardware acceleration stopped the problem.
Ok, thanks. Looks like another "docked Monitor + HWA Usage" Issue. Paul, please post the Content of the Graphics Section you can get via "about:support" after you re-enabled Hardware Acceleration.
Here is the graphics info. Adapter Description: Intel(R) HD Graphics Vendor ID: 8086 Device ID: 0046 Adapter RAM: Unknown Adapter Drivers: igxprd32 Driver Version: 184.108.40.20692 Driver Date: 8-13-2010 Direct2D Enabled: false DirectWrite Enabled: false (0.0.0.0, font cache n/a) WebGL Renderer:Google Inc. -- ANGLE -- OpenGL ES 2.0 (ANGLE 0.0.0.611) GPU Accelerated Windows: 1/1 Direct3D 9
I think this is a duplicate of Bug 633904 (or vice versa). Same behavior, graphics adapter, OS, and similar driver versions.