Package: libqt4-core Version: 4.3.0-4 Severity: normal
I have not seen the bug myself, but I report it on behalf of lyx development. The LyX word processor uses qt4 as its interface. Some users have seen a large slowdown, it turned out that they had machines where DRI was implemented by a software fallback. Commenting out "dri" from the "Module" section speeded things up tremendously. This because disabling DRI completely means that qt4 uses normal X11 instead of direct rendering. I understand that using direct rendering may be a nice speedup when hardware acceleration is in use. But is very slow when there is no smart hardware so the implementation fall back on software. Suggested fix: Surely qt4 does a test to see if DRI is available, and fall back on X11 when DRI isn't present. (Otherwise, qt4 wouldn't work at all on a machine without DRI.) The fix then, is to also check that DRI is backed by hardware before trying to use it. This can't be hard to check. Look at "glxinfo", it will print "direct rendering: yes/no" depending on hardware acceleration. It will print "no" even when DRI is available but backed by software only. Please, just do the same check that glxinfo does, and don't try to use slow software DRI interfaces. This will be a nice speedup for many qt4 apps running on machines without DRI hardware. There are lots of such machines, especially when we get outside the x86 world which debian supports so well. And the fix is rather simple too. :-) -- System Information: Debian Release: lenny/sid APT prefers testing APT policy: (900, 'testing'), (800, 'unstable'), (800, 'stable'), (700, 'experimental') Architecture: i386 (i686) Kernel: Linux 2.6.22-rc6-cfs-v18 Locale: LANG=nb_NO.UTF-8, LC_CTYPE=nb_NO.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/bash Versions of packages libqt4-core depends on: ii libc6 2.6-2 GNU C Library: Shared libraries ii libdbus-1-3 1.1.1-3 simple interprocess messaging syst ii libfontconfig1 2.4.2-1.2 generic font configuration library ii libgcc1 1:4.2-20070712-1 GCC support library ii libglib2.0-0 2.12.13-1 The GLib library of C routines ii libstdc++6 4.2-20070712-1 The GNU Standard C++ Library v3 ii zlib1g 1:1.2.3.3.dfsg-5 compression library - runtime libqt4-core recommends no packages. -- debconf-show failed -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]