[Bug 28456] radeon dri detects different number of pipes each boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28456

--- Comment #9 from J. Kanowitz <jkanowitz at snet.net> 2010-10-12 16:33:20 PDT ---
Just noticed this when doing some work on two "identical" Compaq SR1611NX
desktops.  The 4-pipe log has quite a bit of noise at the end from uptime. 
Both run Ubuntu 9.10 with its kernel "2.6.31-22-generic #65-Ubuntu SMP".

I have not checked whether it persists or varies by reboot, but will keep an
eye on it.  I'm offering my logs to compare in case something immediately
sticks out.

The hardware configuration is highly identical between the machines but BIOS
versions are not; right now the machine coming up with a single pipe actually
has the newer one:

BIOS Information
        Vendor: Phoenix Technologies, LTD
        Version:  3.15
        Release Date: 01/25/2007

than the one showing four:

BIOS Information
        Vendor: Phoenix Technologies, LTD
        Version:  3.10
        Release Date: 10/14/2005

but this is not necessarily significant absent enough restarts to check for a
pattern.  Quickie glxgears 'benchmarking' showed pessimistic results for what
turned out to be the machine that came up "1-piped" (appx. 1500fps vs. 4500fps
at default window size) and got me comparing logs, but that disparity
mysteriously resolved itself on subsequent runs.

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