Hi! I would like to share my experience with solving very frustrating problem with typing in lyx 1.6.x under Ubuntu 9.04. Maybe this will help someone else or even lead to a fix in a next lyx version.
Recently I've upgraded to Ubuntu 9.04. After that, I could not continue my work in lyx 1.6.2. When typing, I experienced a very large delay (like seconds) before all symbols would appear on screen. I read through all posts in lyx mailing list with similar symptoms (just 2 or 3). The only solution there that worked was to buy a new video card. What I've done next: 1) Installed lyx 1.6.0 - the same typing delay. Installed lyx 1.5.7 - no typing delays. Returned back to lyx 1.6.2. 2) Looked at the CPU utilization. When typing, Xorg ate up to 50% CPU. Then I resized lyx window to be smaller. CPU utilization fall down, and typing delay decreased. I resized lyx to be 25% of the screen - typing delay almost disappeared. 3) I looked which video card I have (lspci |grep Display) - Intel Corporation 82945G/GZ Integrated Graphics Controller (rev 02) I googled for problems with Intel graphics under Ubuntu 9, and found this link useful: http://ubuntuforums.org/showthread.php?t=1130582&highlight=ubuntu+slow+update +jaunty 4) I tried different solutions from the link above and mostly got my X broken or no effect. Finally this one worked for me: - open xorg.conf (sudo gedit /etc/X11/xorg.conf) - go to section "Device", mine was Section "Device" Identifier "Configured Video Device" EndSection - add Option "MigrationHeuristic" "greedy" so the section looks now like this Section "Device" Identifier "Configured Video Device" Option "MigrationHeuristic" "greedy" EndSection - restart X or reboot. Now I have almost no typing delays in lyx 1.6.2 (at least, typing speed is the same as in lyx 1.5.7 on my PC).
