Incorrect character rendering on Intel Mobile 4 Series Chipset Integrated Graphics Controller

[Darko S]

Bug
Incorrect character rendering on Intel Mobile 4 Series Chipset Integrated Graphics Controller

Ubuntu 13.10, with frequent updates (weekly at least).
uname: Linux x 3.11.0-18-generic #32-Ubuntu SMP Tue Feb 18 21:11:14 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
/proc/cmdline: BOOT_IMAGE=/boot/vmlinuz-3.11.0-18-generic root=UUID=... ro quiet splash vt.handoff=7

Video driver used:
ii xserver-xorg-video-intel 2:2.99.904-0ubuntu2.1 amd64 X.Org X server -- Intel i8xx, i9xx display driver

lshw extract:
    description: Notebook
    product: 20553AG ()
    vendor: LENOVO
    version: ThinkPad T500
...
        *-display:0
             description: VGA compatible controller
             product: Mobile 4 Series Chipset Integrated Graphics Controller
             vendor: Intel Corporation
             physical id: 2
             bus info: pci@0000:00:02.0
             version: 07
             width: 64 bits
             clock: 33MHz
             capabilities: msi pm vga_controller bus_master cap_list rom
             configuration: driver=i915 latency=0
             resources: irq:46 memory:f4400000-f47fffff memory:d0000000-dfffffff ioport:1800(size=8)
        *-display:1 UNCLAIMED
             description: Display controller
             product: Mobile 4 Series Chipset Integrated Graphics Controller
             vendor: Intel Corporation
             physical id: 2.1
             bus info: pci@0000:00:02.1
             version: 07
             width: 64 bits
             clock: 33MHz
             capabilities: pm bus_master cap_list
             configuration: latency=0
             resources: memory:f4200000-f42fffff

As shown on middle of screenshot, occasionaly some character are incorrectly rendered. If repaint action is triggered
(e.g. selecting text, or somethign similar, depending on application), character is repainted correctly.

[penalvch (penalvch)]

Darko S, thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command, as it will automatically gather debugging information, in a terminal:
apport-collect 1290789

Please ensure you have xdiagnose installed, and that you click the Yes button for attaching additional debugging information.

When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.

[Launchpad Janitor (janitor)]

[Expired for xorg (Ubuntu) because there has been no activity for 60 days.]