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Description of problem:
this also applies to the graphical installation of fedora
When using a TFT-display (Acer 1721) connected via DVI on a Matrox
G550 the configuration fails, the xserver starts in an invalid
So I tried to do it manually.
The monitor has a hsync-range of 30-83kHz and a vsync-range of 55-75Hz
according to Acer, the program sets 30-83Khz and 60-75Hz according to
the config-file (/etc/X11/XF86Config). Resolution is set to the
recommended 1280x1024, color depth is set to 24. When trying to start
X the Xserver starts in an invalid resolution/frequency. I'm not that
familiar, so I simply connected an additional CRT-monitor to the
vga-connector to get to know if it can get to work. The CRT returned a
message telling me something of 32kHZ, invalid frequency. The
xfree-logfile is filled with messages telling me that he cannot find
any matching modes for several resolutions, including 1280x1024.
Even setting the resolution by hand fails when trying to start the
I gave it another try and started the Fedora installation in graphics
mode again, when the installer starts x my TFT is claiming that there
is no valid input anymore - and shutting down. So once again I added
my CRT to see what's going on - and got an extremely flickering
picture, dunno which resolution but the frequency was incredibly low
for my taste, something like 50hz or even interlaced maybe.
Interesting to add is that the installer detected the TFT right as an
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. add Acer 1721 to DVI input at Matrox G550
2. start Fedora installation or redhat-config-xfree86
3. see it failing
Actual Results: no working xserver/no graphical installation possible
Expected Results: well, a working xserver/graphical installation
bug-source found: mga-driver is bugged, it works with the driver
provided by matrox. if interested i can provide additional
information. in general the provided (fedore)mga-driver is completely
unusable in the mentioned combination (tft/crt).
Open source licensed patches to the XFree86 mga driver are more
than welcome. If you or anyone else is aware of a fix for this
problem, I'd be happy to review it for potential inclusion in a
future release. We do not however ship binary only drivers, so
Matrox's provided driver is unacceptable and unuseable to us.
Please attach your XFree86 server log, config file and
/var/log/messages also as individual uncompressed file attachments
using the file attach feature below.
I used the Matrox-drivers. They are also available as source but with
an gpl-incompatible license, reditribution explicitely forbidden. :(
I will add the logs tomorrow. There are still some minor problems with
the DVI-connector but in general it's at least working at all.
Which makes that source code 100% useless to Red Hat and the rest
of the open source community. Also, the specifications for the
G450 and G550 were never made public, not even under NDA.
If the Matrox G550 no longer works properly in open source drivers,
and there is no longer any upstream maintainer maintaining the open
source driver, then it is effectively "unsupported". If that is
the case, and no simple solution presents itself, I will probably
end up redirecting this hardware to the "vesa" driver and disabling
support in the mga driver for non-functioning hardware. If none
of the hardware works anymore, it might be best to just remove
Bottom line really is that we ship drivers that XFree86 supports
by default, and many of them are supplied by us to users as-is. Our
ability to directly support the drivers is limited, and so the more
broken drivers become, the more unuseable they are to us in our
products. A point gets reached where we will consider the hardware
unsupported if it has no active upstream maintainer(s).
We simply don't have the manpower nor the technical documentation
to 100% support all video hardware. The vendors have to have
some responsibility in this area if they want to have their hardware
work out of the box in our OS.
That said, I'll await your logs, and I will do an investigation
for this issue in the future. Perhaps we will get lucky and
there is a fix available somewhere that is legally open source.
Sorry for the delay. As it seems XFree is overwriting the logs with
each start. Since I've given up trying to get the G550 working (I need
to work, not to much time to play around with it) and use nvidia's
FX5200 now I don't have the logs anymore.
I'll suggest to mark the driver as deprecated or unsupported.
When the X server starts, it rotates the previous log to be named
XFree86.$DISPLAY.log.old, so that you can access the previous log
once you start the X server up. Alternately the X server log can
be obtained by booting into runlevel 3 after bootup after a crash.
I'll mark this issue 'WONTFIX' for now, as we do not have the
hardware to reproduce, and there is insufficient information in the
report to be able to try and deduce the problem from logs and
If the problem returns in the future, and anyone is able to
provide a log file and config file, feel free to reopen the report
for tracking. Also recommended is to file a bug report upstream
Thanks for the update.