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der_harm

Member

Registered: 2011-04-12

Posts: 32

Rescan PCI slot

Hello,
I have a problem with 4 GPUs on one motherboard...

I need to do many reboots until all GPUs get recognized. Most successfully when I have switched off the PSU totally. I am trying the second PSU now (1200 W), so that one is not the problem...

I have found this: (ref ff)(prog-if ff)

[root@ArchMiner harm]# lspci -v | grep VGA
  Flags: bus master, VGA palette snoop, 66MHz, medium devsel, latency 64
01:00.0 VGA compatible controller: ATI Technologies Inc Cypress [Radeon HD 5800 Series] (rev ff) (prog-if ff)
02:00.0 VGA compatible controller: ATI Technologies Inc Cypress [Radeon HD 5800 Series] (prog-if 00 [VGA controller])
05:00.0 VGA compatible controller: ATI Technologies Inc Cypress [Radeon HD 5800 Series] (prog-if 00 [VGA controller])
06:00.0 VGA compatible controller: ATI Technologies Inc Cypress [Radeon HD 5800 Series] (prog-if 00 [VGA controller])
[root@ArchMiner harm]#

This causes X not to start, as it would use the first device:
20.484] (WW) fglrx: No matching Device section for instance (BusID PCI:0@0:0:0) found
...

Is there a way to rescan the pci-slot? All cards are identical.
And they do work! Sometimes it works just fine;)

I have tried this:
# echo 1 > /sys/devices/pci0000\:00/0000\:00\:02.0/0000\:01\:00.0/remove
to remove the device from lspci.

I hoped one of these commands would help to rescan the pci slot
# echo 1 > /sys/bus/pci/rescan
# echo 1 > /sys/bus/pci/devices/0000\:02\:00.0/rescan

But no success...:( Is there any chance to redetect the device without rebooting??

Cheers,
Harm

Last edited by der_harm (2011-07-02 21:01:01)

der_harm

Member

Registered: 2011-04-12

Posts: 32

Re: Rescan PCI slot

Well, I still can't get it working properly...

Now I have found this:

[root@ArchMiner ~]# lspci -v | grep VGA
  Flags: bus master, VGA palette snoop, 66MHz, medium devsel, latency 64
01:00.0 VGA compatible controller: ATI Technologies Inc Cypress [Radeon HD 5800 Series] (prog-if 00 [VGA controller])
04:00.0 VGA compatible controller: ATI Technologies Inc Cypress [Radeon HD 5800 Series] (prog-if 00 [VGA controller])
05:00.0 VGA compatible controller: ATI Technologies Inc Cypress [Radeon HD 5800 Series] (prog-if 00 [VGA controller])
[root@ArchMiner ~]#

The cards now are detected even on the wrong slots?! And one is missing...
Need help, please!!