I believe the bisect is done:

Building this commit causes the ethernet to work after reboots. (a PHY
problem seems to make sense as there's no link lights).

bcb3244ccdc4cebb6ed3d47d973da7b1a03837c0 is the first new commit
commit bcb3244ccdc4cebb6ed3d47d973da7b1a03837c0
Author: Sasha Neftin <sasha.nef...@intel.com>
Date:   Wed Jan 8 10:19:24 2020 +0200

    igc: Add PHY power management control
    
    PHY power management control should provide a reliable and accurate
    indication of PHY reset completion and decrease the delay time
    after a PHY reset
    
    Signed-off-by: Sasha Neftin <sasha.nef...@intel.com>
    Tested-by: Aaron Brown <aaron.f.br...@intel.com>
    Signed-off-by: Jeff Kirsher <jeffrey.t.kirs...@intel.com>

 drivers/net/ethernet/intel/igc/igc_defines.h |  1 +
 drivers/net/ethernet/intel/igc/igc_phy.c     | 16 +++++++++++++++-
 drivers/net/ethernet/intel/igc/igc_regs.h    |  1 +
 3 files changed, 17 insertions(+), 1 deletion(-)

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https://bugs.launchpad.net/bugs/1902578

Title:
  Ethernet no link lights after reboot (Intel i225-v 2.5G)

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