How to Change From SNA to UXA Acceleration Methods

Federico Leoni effelle at
Thu Nov 7 19:35:27 UTC 2013

2013/11/7 Lee Gold <leegold at>:
> On Thu, Nov 7, 2013, at 09:40 AM, Federico Leoni wrote:
>> Lee,
>> would you gently post your at least your video configuration?
>> lspci  -mm | grep VGA
>> sudo lshw -c video
>> Thanks,
>> F.
> user at user1-pchut:~$ lspci  -mm | grep VGA
> 00:02.0 "VGA compatible controller" "Intel Corporation"
> "82845G/GL[Brookdale-G]/GE Chipset Integrated Graphics Device" -r01
> "Dell" "Device 0160"
> user at user1-pchut:~$ sudo lshw -c video
> [sudo] password for user:
>   *-display
>        description: VGA compatible controller
>        product: 82845G/GL[Brookdale-G]/GE Chipset Integrated Graphics
>        Device
>        vendor: Intel Corporation
>        physical id: 2
>        bus info: pci at 0000:00:02.0
>        version: 01
>        width: 32 bits
>        clock: 33MHz
>        capabilities: pm vga_controller bus_master cap_list rom
>        configuration: driver=i915 latency=0
>        resources: irq:16 memory:e8000000-efffffff
>        memory:feb80000-febfffff
> user at user1-pchut:~$
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for me could be a issue with the drivers or with shared memory allocation.

First test you can do is to do a spin with the intel driver present on
ppa:xorg-edgers. Here you can find the the newest opensurce intel
driver. The closed Intel Driver is not available at the moment for the
13.10 family. Lubuntu ship with 2:2.99.904-0ubuntu2, they have

sudo apt-add-repository ppa:xorg-edgers/ppa && sudo apt-get update &&
sudo apt-get dist-upgrade

Try with both SNA and UXA. You can revert to stock drivers using
ppa-purge (present on this ppa) if you like.

Second test you can do is try to add to your xorg.conf VideoRam to see
if the problem is the buffer size:

sudo lspci -vv | grep Region

and look for something like

Region 0: Memory at d8000000 (32-bit, prefetchable) [size=256M]
Region 1: Memory at e0380000 (32-bit, non-prefetchable) [size=512K]

Convert the first value in Kb (in this example 256*1024=262144) then
subtract the non-prefetchable value (use the largest you find if more
than one is present)

262144-512= 261632

Then your new xorg.conf should be like this one:

Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "AccelMethod" "uxa"
VideoRam 261632

If something goes wrong enter in recovery mode and delete the
xorg.conf. All should work to normal.
It's good have a look on Launchpad too to see if there are open bug
similar to what you exposed here.

Is up to you now. We'll wait some news.


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