[ubuntu-x] i8xx, again!

Christopher James Halse Rogers raof at ubuntu.com
Mon Sep 6 10:31:27 BST 2010


On Mon, 2010-09-06 at 10:02 +0100, Charles Barnwell wrote:
> Christopher,
> We appreciate your continued support on this.
> I am supporting a group that uses LTSP with Dell clients using a
> mixture of these two cards:
> 00:02.0 VGA compatible controller: Intel Corporation
> 82845G/GL[Brookdale-G]/GE Chipset Integrated Graphics Device (rev 01)
> 00:02.0 VGA compatible controller: Intel Corporation 82865G Integrated
> Graphics Controller (rev 02)
> The 82865G cards work fine, but the Brookdale cards experience regular
> crashes.  This system was upgraded from Karmic (on Karmic the system
> was reliably stable) and all clients seem to be using the i915 driver
> rather than vesa driver.  How did the blacklisting in Lucid work?
> Would it not affect an upgrade?

In Lucid we stayed on the 2.9 version of the intel X driver (it was
already out of date then).  The 2.10 version dropped support for
userspace modesetting, so now if you disable KMS the intel X driver will
not load.

The blacklisting will just be the kernel's default in the absence of
other configuration.  If you've re-enabled KMS on Lucid and upgrade,
you'll still have KMS enabled.

> I have tried the workarounds described in
> https://wiki.ubuntu.com/X/Bugs/Lucidi8xxFreezes and the most
> successful was to enable KMS and disable DRI.  I tried to force use of
> VESA driver, but I never managed to get an acceptable resolution on
> the Brookdale cards.

One of the more… endearing qualities of the i8xx freezes are that which
workaround works best seem to be extremely hardware specific.  Which is
why there's a long list of possible solutions there!

> My big concern is that if you use option 1, and it really does force
> VESA driver then many people may experience poor resolution, which is
> not a good experience for new users.

Yeah.  Ideally we'd give new users the intel driver.  The trick we're
trying is to balance “poor resolution and no 3D” against “doesn't bring
up the GUI” or “crashes every 5 minutes”.

> If we can be sure that people would not experience crashes, but would
> have a good resolution then I also vote for option 1.
> I'm afraid we are going to be swapping the Brookdale machines for
> devices that have a different card, so I will not be able to help in
> any more diagnosis, but we really have to give this customer a stable
> system now.

Perfectly reasonable.  The switch to a GPU memory manager has not been
kind on the i845 chips.
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