Corrupted text (corrected when highlighted)

[will29]

New after I upgraded to Saucy:
Text display becomes garbled (sometimes as I am typing it).


Example:


NOTE: The garbled text is corrected when refreshed, highlighted, or additional text typed.

Any idea what may cause this?
Does Saucy has a new font rendering engine or settings?

[Toz]

Hello and welcome to the forums.

What kind of video card do you have? Entering this command in a terminal window will identify the card and the driver being used:

lspci -k | grep -iA2 VGA

If you have an intel video card, the default acceleration method in saucy was changed to SNA (from UXA), and this causes problems on some intel adapters like you are noticing. To see which acceleration method your system is using:

cat /var/log/Xorg.0.log | grep -i accelmethod

The fix is to revert to the UXA acceleration method.

[will29]

lspci -k | grep -iA2 VGA

reveals:

00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
Subsystem: Lenovo Device 2115
Kernel driver in use: i915
--
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV635/M86 [Mobility Radeon HD 3650]
Subsystem: Lenovo Device 2126

This seems to confirm that SNA is being used:

less /var/log/Xorg.0.log |grep SNA
[ 6.398] (II) intel(0): SNA compiled: xserver-xorg-video-intel 2:2.99.904-0ubuntu2.1 (Robert Hooker <sarvatt@ubuntu.com>)
[ 6.401] (II) intel(0): SNA initialized with Eaglelake (gen4.5) backend

I'll revert back to UXA and see if that fixes the issue.

Thank you very much!