I have mining rig with 4 5870. It worked for about 1 month without any problems.
But now looks like flgrx can't initialize one card.
Ubuntu 11.04 amd64
dmesg
# lspci | grep VGA
01:00.0 VGA compatible controller: ATI Technologies Inc Radeon HD 5870 (Cypress)
04:00.0 VGA compatible controller: ATI Technologies Inc Radeon HD 5870 (Cypress)
05:00.0 VGA compatible controller: ATI Technologies Inc Radeon HD 5870 (Cypress)
06:00.0 VGA compatible controller: ATI Technologies Inc Radeon HD 5870 (Cypress)
root@btc1:~# sudo aticonfig --initial --adapter=all
No protocol specified
Found fglrx primary device section
Found fglrx primary device section
Found fglrx primary device section
$ ./poclbm.py
No device specified or device not found, use -d to specify one of the following
[0] Intel(R) Pentium(R) Dual CPU E2140 @ 1.60GHz
[1] Cypress
[2] Cypress
[3] Cypress
#dmesg | grep fglrx
[ 15.247438] fglrx: module license 'Proprietary. (C) 2002 - ATI Technologies, Starnberg, GERMANY' taints kernel.
[ 16.191869] [fglrx] Maximum main memory to use for locked dma buffers: 916 MBytes.
[ 16.192083] [fglrx] vendor: 1002 device: 6898 count: 1
[ 16.192087] [fglrx] vendor: 1002 device: 6898 count: 2
[ 16.192090] [fglrx] vendor: 1002 device: 6898 count: 3
[ 16.192093] [fglrx] vendor: 1002 device: 6898 count: 4
[ 16.253092] [fglrx] ioport: bar 4, base 0xf000, size: 0x100
[ 16.253179] [fglrx] ioport: bar 4, base 0xb000, size: 0x100
[ 16.253220] [fglrx] ioport: bar 4, base 0x8000, size: 0x100
[ 16.253260] [fglrx] ioport: bar 4, base 0x5000, size: 0x100
[ 16.258196] [fglrx] Kernel PAT support is enabled
[ 16.258264] [fglrx] module loaded - fglrx 8.85.6 [Apr 19 2011] with 4 minors
[ 20.514511] fglrx_pci 0000:01:00.0: irq 52 for MSI/MSI-X
[ 20.515379] [fglrx] Firegl kernel thread PID: 1256
[ 20.515451] [fglrx] Firegl kernel thread PID: 1257
[ 20.515514] [fglrx] Firegl kernel thread PID: 1258
[ 20.515837] [fglrx] IRQ 52 Enabled
[ 21.156559] fglrx_pci 0000:05:00.0: irq 53 for MSI/MSI-X
[ 21.157434] [fglrx] Firegl kernel thread PID: 1260
[ 21.157506] [fglrx] Firegl kernel thread PID: 1261
[ 21.157569] [fglrx] Firegl kernel thread PID: 1262
[ 21.157971] [fglrx] IRQ 53 Enabled
[ 21.487298] fglrx_pci 0000:04:00.0: irq 54 for MSI/MSI-X
[ 21.488168] [fglrx] Firegl kernel thread PID: 1264
[ 21.488244] [fglrx] Firegl kernel thread PID: 1265
[ 21.488307] [fglrx] Firegl kernel thread PID: 1266
[ 21.488691] [fglrx] IRQ 54 Enabled
[ 21.681197] [fglrx] Gart USWC size:312 M.
[ 21.681202] [fglrx] Gart cacheable size:120 M.
[ 21.681209] [fglrx] Reserved FB block: Shared offset:0, size:1000000
[ 21.681212] [fglrx] Reserved FB block: Unshared offset:fc02000, size:fe000
[ 21.681216] [fglrx] Reserved FB block: Unshared offset:3fff4000, size:c000
[ 22.000695] [fglrx] Gart USWC size:312 M.
[ 22.000700] [fglrx] Gart cacheable size:120 M.
[ 22.000707] [fglrx] Reserved FB block: Shared offset:0, size:1000000
[ 22.000710] [fglrx] Reserved FB block: Unshared offset:fc02000, size:fe000
[ 22.000713] [fglrx] Reserved FB block: Unshared offset:3fff4000, size:c000
[ 22.287063] [fglrx] Gart USWC size:312 M.
[ 22.287068] [fglrx] Gart cacheable size:120 M.
[ 22.287075] [fglrx] Reserved FB block: Shared offset:0, size:1000000
[ 22.287079] [fglrx] Reserved FB block: Unshared offset:fc02000, size:fe000
[ 22.287082] [fglrx] Reserved FB block: Unshared offset:3fff4000, size:c000
