Re: Matrox FB console driver

From: Petr Vandrovec (
Date: Wed Apr 25 2001 - 20:44:41 EST

On Tue, Apr 24, 2001 at 06:19:31AM -0500, Andy Carlson wrote:
> time prime before x
> real 1m23.535s
> user 0m40.550s
> sys 0m42.980s
> time prime in X
> real 0m42.835s
> user 0m41.180s
> sys 0m1.710s

There can be two reasons:
(1) You are using matrox's mga module. They have
    'program chip core to production level frequency
    instead of bios safe one' in their changelog.
    Although difference 100% makes (2) more probably.
(2) matroxfb does not try to activate any AGP transfer
    mode. Maybe some X driver tries and succeeds.

You can try:

time dd if=/dev/zero of=/dev/fb0 bs=1M count=8

before X and after X. If times are same, then it is
chip core frequency. If times are 2:1, it is either
chip memory freqency, or AGP...
                                Petr Vandrovec

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This archive was generated by hypermail 2b29 : Mon Apr 30 2001 - 21:00:14 EST