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Re: X server in dom0: Bad VBT signature

Cherry G. Mathew wrote:
On 2 September 2012 13:14, rudolf<netbsd%eq.cz@localhost>  wrote:
I've tried the patch with following results:
   - starting X with vesa driver results in a graphical garbage displayed on
the screen, where the X should be visible, it is possible to switch between
this screen and text wscons screens
   - starting X with intel driver results in "Fatal server error: Unknown GTT
size value: 4e3eff2f" (the number seems to be always the same), last related
lines from Xorg.0.log:

I've also hit another problem, I don't know, if it is related:
   - dom0 with 512 MB RAM: switching between wscons text screen with 25 lines
and text screen with 50 lines causes immediate panic (display is garbled;
"blind" sync, ... savecore -n -Z ...: no core dump)
   - dom0 with 6 GB RAM: switching is ok

Thanks for testing - you probably dtrt, but just checking - was this
patch on top of a clean -current with no extra patches ?

Yes. But now I've made some more experiments with the setup and found the following:

These are my only lines with "status = on" from /etc/ttys:
console "/usr/libexec/getty Pc" vt100  on secure
ttyE1   "/usr/libexec/getty Pc" wsvt25 on secure

I've made tests with following two variants of "screen" lines in /etc/wscons.conf:
screen  1       80x25   vt100
screen  2       80x50   vt100
screen  3       80x25   vt100
screen  4       -       -
screen  1       80x25   vt100
screen  2       80x25   vt100
screen  3       80x25   vt100
screen  4       -       -

Variant 1) causes panic upon switching to the screen with 50 lines not only under the patched kernel with 512 MB RAM - it panics with an unpatched XEN3_DOM0 kernel (daily 201209010830Z) with 512 MB RAM as well.

Variant 1) also causes different kind of problems (panics or garbage on display) starting the X server with the patched kernel (tested under 512 MB and 6 GB RAM, vesa and intel drivers, all wrong).

When I changed the wscons.conf to variant 2), it was possible to start and use the X server under the patched kernel (tested under 512 MB and 6 GB RAM, vesa and intel drivers, all ok).

I hope I haven't interchanged any results, if you have any doubts, I can test any of these setups again.


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