mga with default depth 16 turns computer off???

[Felix Miata]

On 2013-12-20 08:53 (GMT-0500) Alex Deucher composed:

> On Felix Miata wrote:

>> This 1.13GHz i815 Piii with G400 AGP is multiboot which I've been updating
>> over the past couple of days, Fedora 21, openSUSE 12.3, 13.1 & 13.2. It's
>> been reliable for years, but tonight it has been acting like the power plug
>> has been pulled shortly after KDE finishes initializing my desktop. This
>> happened first in 13.2 a few times with 3.11.10 kernel, so I tried and got
>> same result in 13.1 with 3.11.6 kernel. Previously xorg.conf was written
>> with default depth 24, but tonight I changed it to 16, and only then did the
>> crashing start. I've currently booted back to 13.2 but with xorg.conf
>> changed back to default depth 24 and it hasn't crashed yet. So it seems like
>> 16 bit X with MGA is broken, while 24 is not. Am I missing something? I
>> don't see any open bugs that look anything like this, except for one ancient
>> one: https://bugs.freedesktop.org/show_bug.cgi?id=8237

> If you can narrow down which component caused the problem (xserver,
> mesa, mga ddx) you may be able to bisect it and figure out what caused
> it.  Unfortunately mga chips are pretty old and thus not well tested
> on modern software stacks these days.

Thanks! Further investigation revealed the problem is in openSUSE and/or 
KDE3, so I filed a Novell bug: https://bugzilla.novell.com/show_bug.cgi?id=856606

Good thing there and not xserver, mesa, mga ddx, because I found no kind of 
recognizable clues in dmesg or any logs.

FWIW, Dell T610 PowerEdge servers as recently as 5 years ago were shipped 
with G200eW chips on the motherboard. More importantly, MGA users do not 
suffer from https://bugs.freedesktop.org/show_bug.cgi?id=39949
--
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