On 2019.07.11 19:08, Mick wrote:
On Thursday, 11 July 2019 23:31:51 BST Jack wrote:
I'm hoping the cumulative wisdom of the assembled masses might be
able to figure out what I'm clearly missing, assuming there IS
something I'm missing.
>
I've recently assembled a new PC, with an MSI B350-Tomahawk
motherboard and a Ryzen 5 2600 CPU. (We'll skip that I ended up
actually buying an older Ryzen just to upgrade the BIOS.) The
problem is that I have now tried three different PCI-E graphics
cards, and have gotten no video signal from any of them. I do get a
video signal from an ancient PCI graphics card. One of the cards is
a very old Radeon, one is a slightly less old nVidia, and the newest
is (from lspci) "Advanced Micro Devices, Inc. [AMD/ATI] Cape Verde
XT [Radeon HD 7770/8760 / R7 250X]."
>
What I find particularly odd is that if I log in blind, and then
issue startx, X (startkde) seems to be running fine. I ssh in from
another PC, and the X log shows the Radeon driver loading, the
monitor being recognized on the appropriate connector, the EDID
received, and the right resolution being chosen. (Even without all
the AMD drivers and firmware loaded, at least it also seemed to
start with the VESA driver, but still no output signal.)
>
I can easily believe the old radeon card is dead, and possibly even
the nVidia card. However, given what I see in the logs with the new
radeon card, I find it hard to believe the card is actually
defective. (Just purchased used on eBay, so I do have to admit the
possibilty.) However, I have trouble imagining what else could be
the problem. I've tried two different cables (both of which work
fine for the PCI card) but both use DVI to VGA adaptors, although I
can't imagine why that would matter now, if they worked for a
different card. I have ordered a new DVI cable to go directly from
the card to the monitor, so hopefully I'll get that and be able to
test it within a few days.
>
Can anyone else thing of what the problem might be, and if there is
any troubleshooting I could try?
Brief response for now:
If dmesg after you login remotely shows the graphics card firmware is
available in the kernel, radeon/nvidia drivers are loading and no
errors are printed, then hardware wise your PC ought to be OK.
If /var/log/Xorg.0.log shows no errors with drivers and monitor, then
I don't know what to suggest other than following a process of
elimination, by trying:
- different cables
- different monitor
However, if cables or monitor were at fault I would expect warnings
to show up in the log files.
Well, using a DVI cable, it works just fine. So, I am assuming some
bizarre partial incompatibility between the analog signal the card was
sending out through the DVI connector and what the monitor actually
needed. The fact that the logs seem to show that the card properly
recognized the monitor still makes no sense to me, but I doubt it's
worth any more time trying to figure out what was actually going on.
Too much to do to finish configuring and installing stuff, and then
make sure I've migrated everything important from the old to the new
machine.
Jack
