I'm migrating from LFS to Gentoo currently and I found this interesting bug: I noticed that when Opera web browser is run on behind and I move a window (terminal for example) over it, an ugly "train" remains. You can see what I'm speeking about on the video (see the URL above). That was different from X server behaviour on my LFS system. So I spent several hours to find the root of the problem and found that LFS init system runs all services with nice level of 10 by default. And (what a surprise!) system responsiveness is better than when having nice level of 0. I offer to add an option to change X server nice level to xinit script provided by Gentoo. I'm gonna attach my version of the ebuild's "files" I use. You may alter it whatever way you want. Reproducible: Always Steps to Reproduce: 1. Run opera (microsoft corefonts are installed), make it fullscreen. 2. Go to URL http://www.myopera.net/forums/arhiv/44775.html (the bug is well reproduced on that page) 3. Run Terminal (x11-terms/terminal) or any other windowed application and move it's window over opera. You should see nice trails. 4. If running XFce you should turn off window compositor (that's mandatory). It's off by default, anyway. Probably the bug is not reproduced when hardware accelerated windows manager is on. So, no beryl and others, please. Actual Results: "Nice" trails appear when moving the window. Check this: http://www.youtube.com/watch?v=dzSEzckheOs Expected Results: No trails. Background window should be redrawn immediately. Check this (same system, X server runs on nice level 10): http://www.youtube.com/watch?v=xplN_AUX-Y4 I think the bug should be easily reproduced. But who knows... My hardware configuration: CPU: Celeron 2.66 GHz (single-core) VIDEO: NVidia AGP GeForce-6600 (with nvidia proprietary driver) ~ $ emerge --info Portage 2.1.6.13 (default/linux/x86/2008.0/desktop, gcc-4.3.2, glibc-2.9_p20081201-r2, 2.6.30-gentoo-r6 i686) ================================================================= System uname: Linux-2.6.30-gentoo-r6-i686-Intel-R-_Celeron-R-_CPU_2.66GHz-with-gentoo-1.12.11.1 Timestamp of tree: Fri, 18 Sep 2009 15:15:02 +0000 app-shells/bash: 4.0_p28 dev-lang/python: 2.6.2-r1 sys-apps/baselayout: 1.12.11.1 sys-apps/sandbox: 1.6-r2 sys-devel/autoconf: 2.63-r1 sys-devel/automake: 1.9.6-r2, 1.10.2 sys-devel/binutils: 2.18-r3 sys-devel/gcc-config: 1.4.1 sys-devel/libtool: 2.2.6a virtual/os-headers: 2.6.27-r2 ACCEPT_KEYWORDS="x86" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1 emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mmap_emul mulaw multi null plug rate route share shm softvol" APACHE2_MODULES="actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" ARCH="x86" AUTOCLEAN="yes" CBUILD="i686-pc-linux-gnu" CFLAGS="-O2 -march=i686 -pipe" CHOST="i686-pc-linux-gnu" CLEAN_DELAY="5" COLLISION_IGNORE="/lib/modules" COLORTERM="Terminal" CONFIG_PROTECT="/etc" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo /etc/udev/rules.d" CVS_RSH="ssh" CXXFLAGS="-O2 -march=i686 -pipe" DBUS_SESSION_BUS_ADDRESS="unix:abstract=/tmp/dbus-kCYF6eWSCD,guid=bbac1c8ff9102dbca89d7da24ab674b2" DESKTOP_SESSION="xfce" DISPLAY=":0.0" DISTDIR="/usr/portage/distfiles" EDITOR="/usr/bin/vim" ELIBC="glibc" EMERGE_DEFAULT_OPTS="--ask --verbose --tree" EMERGE_WARNING_DELAY="10" FEATURES="distlocks fixpackages parallel-fetch protect-owned sandbox severe sfperms strict unmerge-orphans userfetch webrsync-gpg" FETCHCOMMAND="/usr/bin/wget -t 5 -T 60 --passive-ftp -O "${DISTDIR}/${FILE}" "${URI}"" GCC_SPECS="" GDK_USE_XFT="1" GDMSESSION="xfce" GDM_XSERVER_LOCATION="local" GENTOO_MIRRORS="http://mirror.yandex.ru/gentoo-distfiles/ " GLADE_CATALOG_PATH=":" GLADE_MODULE_PATH=":" GLADE_PIXMAP_PATH=":" GTK_PATH=":/usr/lib/gtk-2.0" HG="/usr/bin/hg" HISTIGNORE="&:ls:[bf]g:exit" HOME="/home/spinal" INFOPATH="/usr/share/info:/usr/share/binutils-data/i686-pc-linux-gnu/2.18/info:/usr/share/gcc-data/i486-pc-linux-gnu/4.1.2/info:/usr/share/gcc-data/i686-pc-linux-gnu/4.3.2/info" INPUT_DEVICES="evdev keyboard mouse" KERNEL="linux" LANG="ru_RU.UTF-8" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LC_NUMERIC="C" LDFLAGS="-Wl,-O1" LESS="-R -M --shift 5" LESSOPEN="|lesspipe.sh %s" LIBGLADE_MODULE_PATH=":/usr/lib/libglade/2.0" LINGUAS="ru" LOGNAME="spinal" LS_COLORS="rs=0:di=01;34:ln=01;36:hl=44;37:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=01;05;37;41:mi=01;05;37;41:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arj=01;31:*.taz=01;31:*.lzh=01;31:*.lzma=01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.dz=01;31:*.gz=01;31:*.bz2=01;31:*.bz=01;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.rar=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.jpg=01;35:*.jpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.nuv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.axv=01;35:*.anx=01;35:*.ogv=01;35:*.ogx=01;35:*.pdf=00;32:*.ps=00;32:*.txt=00;32:*.patch=00;32:*.diff=00;32:*.log=00;32:*.tex=00;32:*.doc=00;32:*.aac=00;36:*.au=00;36:*.flac=00;36:*.mid=00;36:*.midi=00;36:*.mka=00;36:*.mp3=00;36:*.mpc=00;36:*.ogg=00;36:*.ra=00;36:*.wav=00;36:*.axa=00;36:*.oga=00;36:*.spx=00;36:*.xspf=00;36:" MANPATH="/usr/local/share/man:/usr/share/man:/usr/share/binutils-data/i686-pc-linux-gnu/2.18/man:/usr/share/gcc-data/i486-pc-linux-gnu/4.1.2/man:/usr/share/gcc-data/i686-pc-linux-gnu/4.3.2/man:/usr/qt/3/doc/man:/opt/opera/share/man" NETBEANS="apisupport cnd groovy gsf harness ide identity j2ee java mobility nb php profiler soa visualweb webcommon websvccommon xml" OPENGL_PROFILE="nvidia" PAGER="/usr/bin/less" PATH="/usr/local/bin:/usr/bin:/bin:/opt/bin:/usr/i486-pc-linux-gnu/gcc-bin/4.1.2:/usr/i686-pc-linux-gnu/gcc-bin/4.3.2:/usr/qt/3/bin" PKGDIR="/usr/portage/packages" PKG_CONFIG_PATH="/usr/qt/3/lib/pkgconfig" PORTAGE_ARCHLIST="ppc x86-openbsd ppc-openbsd ppc64 x86-winnt x86-fbsd ppc-aix alpha arm x86-freebsd s390 amd64 x86-macos x64-openbsd ia64-hpux hppa x86-netbsd amd64-linux ia64-linux x86 sparc-solaris x64-freebsd sparc64-solaris x86-linux x64-macos sparc m68k-mint ia64 mips ppc-macos x86-interix hppa-hpux amd64-fbsd x64-solaris mips-irix m68k sh x86-solaris sparc-fbsd" PORTAGE_BINHOST_CHUNKSIZE="3000" PORTAGE_BIN_PATH="/usr/lib/portage/bin" PORTAGE_COMPRESS_EXCLUDE_SUFFIXES="css gif htm[l]? jp[e]?g js pdf png" PORTAGE_CONFIGROOT="/" PORTAGE_DEBUG="0" PORTAGE_DEPCACHEDIR="/var/cache/edb/dep" PORTAGE_ELOG_CLASSES="log warn error" PORTAGE_ELOG_MAILFROM="portage@localhost" PORTAGE_ELOG_MAILSUBJECT="[portage] ebuild log for ${PACKAGE} on ${HOST}" PORTAGE_ELOG_MAILURI="root" PORTAGE_ELOG_SYSTEM="save_summary echo" PORTAGE_FETCH_CHECKSUM_TRY_MIRRORS="5" PORTAGE_FETCH_RESUME_MIN_SIZE="350K" PORTAGE_GID="250" PORTAGE_GPG_DIR="/root/.gnupg" PORTAGE_INST_GID="0" PORTAGE_INST_UID="0" PORTAGE_PYM_PATH="/usr/lib/portage/pym" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --stats --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages" PORTAGE_RSYNC_RETRIES="3" PORTAGE_TMPDIR="/var/tmp" PORTAGE_VERBOSE="1" PORTAGE_WORKDIR_MODE="0700" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/local/portage" PROFILE_ONLY_VARIABLES="ARCH ELIBC KERNEL USERLAND" PWD="/home/spinal" QMAKESPEC="linux-g++" QTDIR="/usr/qt/3" RESUMECOMMAND="/usr/bin/wget -c -t 5 -T 60 --passive-ftp -O "${DISTDIR}/${FILE}" "${URI}"" ROOT="/" ROOTPATH="/opt/bin:/usr/i486-pc-linux-gnu/gcc-bin/4.1.2:/usr/i686-pc-linux-gnu/gcc-bin/4.3.2:/usr/qt/3/bin" RPMDIR="/usr/portage/rpm" SESSION_MANAGER="local/supervisor:@/tmp/.ICE-unix/5413,unix/supervisor:/tmp/.ICE-unix/5413" SHELL="/bin/bash" SHLVL="2" SSH_AGENT_PID="5403" SSH_AUTH_SOCK="/tmp/ssh-dvLcJz5387/agent.5387" SYNC="rsync://rsync.europe.gentoo.org/gentoo-portage" TERM="xterm" USE="X a52 aac acpi alsa bash-completion berkdb branding bzip2 cairo cdr cli consolekit cracklib dbus dri dts dvd dvdr eds emboss evo fam fbcon firefox flac fontconfig gdbm gif gpm gstreamer gtk hal iconv isdnlog jpeg libnotify mad mp3 mp4 mpeg mudflap ncurses nls nptl nptlonly ogg opengl openmp pam pcre pdf perl png ppds pppd python qt4 quicktime readline reflection session spl ssl startup-notification svg sysfs tcpd thunar tiff truetype unicode usb vim-syntax vorbis win32codecs x264 x86 xcb xcomposite xml xorg xulrunner xv zlib" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1 emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mmap_emul mulaw multi null plug rate route share shm softvol" APACHE2_MODULES="actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" ELIBC="glibc" INPUT_DEVICES="evdev keyboard mouse" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LINGUAS="ru" USERLAND="GNU" VIDEO_CARDS="nvidia" USER="spinal" USERLAND="GNU" USERNAME="spinal" USE_EXPAND="ALSA_CARDS ALSA_PCM_PLUGINS APACHE2_MODULES APACHE2_MPMS CAMERAS CROSSCOMPILE_OPTS DVB_CARDS ELIBC FCDSL_CARDS FOO2ZJS_DEVICES FRITZCAPI_CARDS INPUT_DEVICES KERNEL LCD_DEVICES LINGUAS LIRC_DEVICES MISDN_CARDS NETBEANS_MODULES QEMU_SOFTMMU_TARGETS QEMU_USER_TARGETS SANE_BACKENDS USERLAND VIDEO_CARDS" USE_EXPAND_HIDDEN="CROSSCOMPILE_OPTS ELIBC KERNEL USERLAND" USE_ORDER="env:pkg:conf:defaults:pkginternal:env.d" VIDEO_CARDS="nvidia" WINDOWID="46140307" WINDOWPATH="7" XAUTHORITY="/home/spinal/.Xauthority" XDG_DATA_DIRS="/usr/local/share/:/usr/share/:/usr/share/gdm/:/usr/share" _="/usr/bin/emerge"
Created attachment 204740 [details] files to change in ebuild
I for one cannot reproduce this bug with my 4 year-old laptop, so I'm betting drivers are a more likely cause of the bug. In any case, changing the nice level of Xorg probably will have other consequences. It's probably too dangerous to have such an option. You might want to file a bug report at nvidia (there's a bug reporting script that comes with the drivers) instead. Thanks
