[Bug 93541] New: Audacity scrolling/zooming when zoomed in is painfully slow

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed Dec 30 09:16:47 PST 2015


            Bug ID: 93541
           Summary: Audacity scrolling/zooming when zoomed in is painfully
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: s_chriscollins at hotmail.com
        QA Contact: xorg-team at lists.x.org

Here is a video I made demonstrating this bug:

Steps to reproduce:
1) Open Audacity.
2) Drag an audio file into Audacity, preferably something at least a minute in
3) Use CTRL-mouse wheel to zoom in a little bit.
4) Drag the horizontal scrollbar back and forth. You should see smooth
5) Zoom in further, even up to the sample level, but you don't need to go that
far. You should notice the zooming operation start to get laggy.
6) Drag the horizontal scrollbar back and forth.

Result: The scrolling is unbearably choppy. On my system, the scrolling
operation eats up an entire CPU core.

Expected result: The scrolling should be smooth and not eat an entire CPU core.

** My System **
OS: Kubuntu 14.04 64-bit w/ KDE SC 4.14.13
PC: HP Pavilion m6-1035dx
CPU/GPU: AMD A10-4600M APU with Radeon HD 7660G Graphics
RAM: 6GB DDR3 800 MHz
Linux Kernel: 3.16.0-57-generic
Screen Resolution: 1366 x 768

I have also tested this using a Kubuntu 15.10 live USB with the same results
(not sure of kernel/xorg version used). I will be happy to do more tests if

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