On 20 Apr 2025 09:28:23 -0700, Peter wrote in message
<20250420162832.9EDD7223152@???>:

> Hi,
>
> Daedalus installed on a HP Pavilion a6345f here.

..with a 2.40GHz Intel Core 2 Quad Q6600 Socket 775 cpu?
Chk with: lshw |less

..also try: lspci -nn | grep -E 'VGA|Display'
and: dmesg | egrep 'drm|radeon'

..and: xrandr -q --verbose |less # details in man xrandr,
man xvidtune is also worth a read.
(It's been 15 years since I last messed around with Radeons,
and Google sucks nowadays, even as a basic human memory
support tool for tools.)

..if gou get a web browser up, try it on: https://www.testufo.com/

> With the monitor connected to on-board video, the system works with
> no obvious problem.
>
> I use two screens and fit a Radeon X600Pro 256MB V/D/VO adapter to
> the PCIE X16 socket.

..one of these?:
https://duckduckgo.com/?q=Radeon+X600Pro+256MB+V%2FD%2FVO&ia=images&iax=images
https://www.gpuzoo.com/GPU-ATI/Radeon_X600_PRO.html possibly
https://www.techpowerup.com/gpu-specs/radeon-x600-pro.c25 which
mentions "Recommended Gaming Resolutions: 640x480 1280x720 1366x768"

..your card should have a 2 decades old RV380 graphics processor
which should work best with the xserver-xorg-video-radeon display
driver, details in: apt-cache show xserver-xorg-video-radeon |less

..you will also want to chk the details on these: ...
apt-cache search radeon

...with:
apt-cache show $(apt-cache search radeon |cut -d" " -f1 ) |less

..in https://wiki.x.org/wiki/RadeonFeature/ chk the R300 column.

..if you push it too far out of video memory, you'll see flickering or
even black outs on the lowest ranked display, hint is back off a bit,
256MB is not a lot these days. It's fully supported by e.g. Ubuntu:
https://help.ubuntu.com/community/RadeonDriver
https://wiki.debian.org/AtiHowTo

..one way to save on video ram is backing off on the colors,
e.g. down to 24bpp or 15bpp. Playing around with
https://www.omnicalculator.com/other/video-frame-size suggests
it can do both 1920x1200x24bpp@35Hz or 1920x1200x32bpp@27Hz
before running out of video memory.
https://trychen.com/feature/video-bandwidth

> In the BIOS, PCIE X16 was set as primary. No problem evident from
> the BIOS.
>
> The GRUB display appears and daedalus can be chosen.
>

> This line appears on the screen. 
> [    0.000028] x86/cpu: VMX (outside TXT) disabled by BIOS.

>
> After about 2 minutes the screen turns black. That remains except
> for an occasional brief flash of message. May be the monitor notice
> of absent video input; too brief to be certain.
>
> The result is the same when VMX is disabled and when enabled.
>
> Anyone using this or similar machine? With two screens? Anyone
> using this Radeon adapter?

..15 to 25 years ago I went from the 9200, X850 to the 4890 all at
2048x1536x32bpp@30ishHz that needed a fair bit of "right rudder" in
the modelines I used to ntraighten up my old crappy 20" monitor.
Nowadays I run a coupla Dell Precision M4400 as my daily drivers with
G96GLM [Quadro FX 770M] cards 1920x1200x32bpp@59.972Hz on the nouveau
display driver on 6.12.12+bpo-rt-amd64 and 6.1.0-0.deb11.32-rt-amd64
because the RT kernels eleminates one of those red ugly buttons at
the bottom of the output of:
mkdir -vp spectre-meltdown-checker # the first time ever, then:
cd spectre-meltdown-checker/ ;git status ;git pull ;cd - ;sh \
spectre-meltdown-checker/spectre-meltdown-checker.sh -v --explain


>
> Additional ideas?

..a few: https://x.org/wiki/UserDocumentation/GettingStarted/
https://x.org/wiki/FAQ/


>

> Thanks,                   ... P.

>


--
..med vennlig hilsen = with Kind Regards from Arnt Karlsen
...with a number of polar bear hunters in his ancestry...
Scenarios always come in sets of three:
best case, worst case, and just in case.