I'm having similar speed issues and strange horizontal lines all over
the screen randomly... they appear for a second and disappear.
I too have gone from Trusty to Utopic.
This page had some things to try
https://wiki.archlinux.org/index.php/Intel_graphics#SNA_issues
Going to accelmode UXA
I can confirm the same but but I don't believe it has anything to do
with Libreoffice as I've not had it open when this occurred. Adding
requested attachments (looks like i can only do one at a time)...
** Attachment added: uname.txt
** Attachment added: lspci.txt
https://bugs.launchpad.net/ubuntu/+source/libreoffice/+bug/786949/+attachment/2178030/+files/lspci.txt
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** Attachment added: dmidecode.txt
https://bugs.launchpad.net/ubuntu/+source/libreoffice/+bug/786949/+attachment/2178031/+files/dmidecode.txt
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** Attachment added: kern.log
https://bugs.launchpad.net/ubuntu/+source/libreoffice/+bug/786949/+attachment/2178035/+files/kern.log
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Title:
Please let me know if anything else is needed...
** Attachment added: acpi.tar.bz
https://bugs.launchpad.net/ubuntu/+source/libreoffice/+bug/786949/+attachment/2178036/+files/acpi.tar.bz
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