I am making some test on my i815 (which I think it's an i810) with the
intel driver shipped with intrepid alpha4 (2.4.0-1ubuntu1). My starting
xorg.conf only has the default option, nothing related to the driver,
depth or else.
DefaultDepth is already default to 16 and DRI is enabled.
I have the corruption problem with 3D apps. Option "XaaNoPixmapCache"
does not fix it. To fix it I have to use the workaround of bug #214168,
see comments starting from 2008-07-29.
unggnu:
> Most likely the VideoRam option fixes your 3D issues but the point which I
> don't understand is according to manpage VideoRam
> option should be ignored by -intel driver.
> "By default, the i810 will use 8 megabytes of system memory for graphics. For
> the 830M and later, the driver will automatically size its
> memory allocation according to the features it will support. The VideoRam
> option, which in the past had been necessary to allow more
> than some small amount of memory to be allocated, is now ignored."
This appears to not be true: VideoRam option is not ignored (at least on my
card) and defaults to 24576. Note that I have 384 MB of RAM. If I have to guess
I would say that VideoRam in i810 defaults to 8192 * (total MB RAM / 128). Note
also that there is a limit, when this value is too high (e.g. 65536) it prints
a warning in the Xorg log: "Truncating to 50331648 bytes of memory".
I only tested glxgears since I am on the LiveCD and can't install big
applications. Note, however, that glxgears framerate is about the same when
VideoRam >= 16384 (at about 363 FPS). Note also that VideoRam 8192 disables DRI
and glxgears drops to 70 FPS.
So this bug could be closed, maybe we should update the intel man page
saying that the VideoRam options is not always 8 MB for i810 (but
probably varies with the total RAM) and when it's 8MB (i.e. VideoRam
8192) DRI is disabled.
Let me know if you need some Xorg log or other tests.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Incomplete => In Progress
--
bugs and fixes to play 3d games on i810 i815
https://bugs.launchpad.net/bugs/243991
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