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[Bug 1290789] [NEW] Incorrect character rendering on Intel Mobile 4 Series Chipset Integrated Graphics Controller

To: touch-packages@xxxxxxxxxxxxxxxxxxx
From: Launchpad Bug Tracker <1290789@xxxxxxxxxxxxxxxxxx>
Date: Thu, 24 Sep 2015 08:49:27 -0000
Reply-to: Bug 1290789 <1290789@xxxxxxxxxxxxxxxxxx>
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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.

** Affects: xorg (Ubuntu)
     Importance: Low
         Status: Incomplete

-- 
Incorrect character rendering on Intel Mobile 4 Series Chipset Integrated Graphics Controller
https://bugs.launchpad.net/bugs/1290789
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