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I have a DVBSky T9580 PCI tuner card.

My problem is that after rebooting,, the device dissapears, lspci does not list it any more.

I tried rebooting with reboot command as well as shutdown -r 0. Only powering the PC off and on resolves the situation.

My questions are:

  1. How can I isolate whether it is a hardware problem or Linux problem.
  2. Is it possible to tell Linux to rescan the PCI bus for devices?
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    This doesn't answer your questions, but have you tried reseating the card? – Andy Dalton Sep 15 '15 at 21:22
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    If, from Linux's point of view, the card is sometimes detected during startup and sometimes not, depending on whether it was a cold boot or a warm boot, then it's a hardware problem: at the software level, startup after a cold boot and startup after a warm boot are the same thing. – Gilles Sep 15 '15 at 22:57
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I have a similar problem with my PCIe SSD, adding reboot=pci kernel parameter seems to solve the problem.

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