This bug appears in current (X)ubuntu 16.10. Whether appears in 16.04 is unknown. (Perhaps not, else I could notice it earlier.) I tried to make a test in a virtual (virtualboxed) Xubuntu_16.04.1 - no bug! Then I made a test in a (similar) virtualboxed Xubuntu_16.10 - no bug either! So in "real" Xubuntu the bug appears, but in virtualboxed one (the *same* Xubuntu) does not.
When I do scrolling (in a TotalCmd filecontent-comparison window), (in the real Xubuntu) Xorg consumes about 23% CPU, which I guess probably means almost 100% of one "core" (or "cpu thread" or what). I have a 64bit Samsung laptop, with i915 video. I will try to attach output of 'lspci -vvnn' and two /var/log/Xorg.0.log* files. $ rdesktop rdesktop: A Remote Desktop Protocol client. Version 1.8.3. Copyright (C) 1999-2011 Matthew Chapman et al. [...] The command line was: $ rdesktop -u xxuserxx -k hu -g 1500x900 -a 16 -z -P -r clipboard:CLIPBOARD xx.ip.addr.xx ** Attachment added: "lspci_out" https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/378958/+attachment/4803584/+files/lspci_out -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xserver-xorg-video-ati in Ubuntu. https://bugs.launchpad.net/bugs/378958 Title: xorg 100% cpu when scrolling in rdesktop Status in xserver-xorg-video-ati package in Ubuntu: Invalid Bug description: After upgrading from Ubuntu 8.10 to 9.04, my rdesktops to Windows servers are unusable. Screen refreshes inside rdesktop are awfully slow. Scrolling a logfile causes xorg to take 100% cpu. I'm using Ubuntu 9.04 as default as possible, no xorg.conf editing or other vga drivers. I have a ThinkPad Z60m with an ATI x600 mobility: root@tp:~# lspci |grep -i vga 01:00.0 VGA compatible controller: ATI Technologies Inc M24 1P [Radeon Mobility X600] Very easy to reproduce with default settings: - launch laptop from Ubuntu 9.04 live cd - open rdesktop or tsclient to a Windows machine - open a large logfile or a putty window - watch how the screen in building up line per line, slowing down even more near the buttom of the screen I tested other ThinkPads with other vga cards, they don't have this issue. - Z61m with ATI x1400 = ok - R61 with nVidia = ok A few more observations: - 2D and 3D in Ubuntu works fine with the new default driver (great job :-) - Visual Effects (Compiz?) work fine, on 'normal' and even 'extra', but have no effect on the reported issue. I always disable the visial effects. - scrolling in other applications works fine and fast (FF3, gedit, terminal,...) - I use rdesktop in a windowed mode (1280x960), RDPv5 - I tried rdesktop bitmap caching enable/disable, same for both - when I launch a Windows RDP inside my rdesktop, this 2nd RDP does NOT suffer the same problem To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/378958/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
