r9 290x - one of 2 cards no longer visible to zogminer

[professoruss]

I got this running earlier today and on boot, zcash-miner -listdevices shows both cards.

I fire up one instance
zcash-miner -G -S=0 -stratum=stratum+tcp://us1-zcash.flypool.org:3333 -user=<address>.0
mines well at 33H/s
Fire up a second instance
zcash-miner -G -S=1 -stratum=stratum+tcp://us1-zcash.flypool.org:3333 -user=<address>.1
starts mining like the first for about 30s-1m then just hangs and stops mining.
Upon hitting ctrl-c and running zcash-miner -listdevices it only shows one card at this point.

Nothing in syslog, dmesg, etc.
lspci shows the device
clinfo shows the device
Ubuntu 16.04 - Fresh install today
amdgpu-pro drivers

First part of clinfo:
`Number of platforms 1
Platform Name AMD Accelerated Parallel Processing
Platform Vendor Advanced Micro Devices, Inc.
Platform Version OpenCL 2.0 AMD-APP (2117.10)
Platform Profile FULL_PROFILE
Platform Extensions cl_khr_icd cl_amd_event_callback cl_amd_offline_devices
Platform Extensions function suffix AMD

Platform Name AMD Accelerated Parallel Processing
Number of devices 2
Device Name Hawaii
Device Vendor Advanced Micro Devices, Inc.
Device Vendor ID 0x1002
Device Version OpenCL 1.2 AMD-APP (2117.10)
Driver Version 2117.10 (VM)
Device OpenCL C Version OpenCL C 1.2
Device Type GPU
Device Profile FULL_PROFILE`

[professoruss]

Looks like the newer version has helped with this (or updating my bios)