hwrng on 82801EB/ER (ICH5/ICH5R) fails rngtest checks

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with latest HEAD of Linus' tree I got /dev/hwrng but although the device
exists rngtest does not pass as if hwrng does not work correctly.
actually this case is documented in the README supplied by Debian
but I'm surprised to hit the problem.

I'm just curious whether there's a bug in the driver, the hwrng is bad
or if it is falsely detected and made accessible via /dev/hwrng.

rngtest 2-unofficial-mt.10
Copyright (c) 2004 by Henrique de Moraes Holschuh
This is free software; see the source for copying conditions.  There
is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.

rngtest: starting FIPS tests...
rngtest: bits received from input: 200032
rngtest: FIPS 140-2 successes: 0
rngtest: FIPS 140-2 failures: 10
rngtest: FIPS 140-2(2001-10-10) Monobit: 10
rngtest: FIPS 140-2(2001-10-10) Poker: 10
rngtest: FIPS 140-2(2001-10-10) Runs: 10
rngtest: FIPS 140-2(2001-10-10) Long run: 10
rngtest: FIPS 140-2(2001-10-10) Continuous run: 10
rngtest: input channel speed: (min=1.132; avg=2.157; max=2.794)Mibits/s
rngtest: FIPS tests speed: (min=202.909; avg=206.647; max=211.928)Mibits/s
rngtest: Program run time: 89804 microseconds


lspci
00:00.0 Host bridge: Intel Corporation E7520 Memory Controller Hub (rev 0c)
00:02.0 PCI bridge: Intel Corporation E7525/E7520/E7320 PCI Express Port A (rev
0c)
00:06.0 PCI bridge: Intel Corporation E7520 PCI Express Port C (rev 0c)
00:1d.0 USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB UHCI Contr
oller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB UHCI Contr
oller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB UHCI Contr
oller #3 (rev 02)
00:1d.3 USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB UHCI Contr
oller #4 (rev 02)
00:1d.7 USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB2 EHCI Cont
roller (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev c2)
00:1f.0 ISA bridge: Intel Corporation 82801EB/ER (ICH5/ICH5R) LPC Interface Brid
ge (rev 02)
00:1f.1 IDE interface: Intel Corporation 82801EB/ER (ICH5/ICH5R) IDE Controller
(rev 02)
01:03.0 VGA compatible controller: ATI Technologies Inc Rage XL (rev 27)
01:04.0 System peripheral: Compaq Computer Corporation Integrated Lights Out Con
troller (rev 01)
01:04.2 System peripheral: Compaq Computer Corporation Integrated Lights Out  Pr
ocessor (rev 01)
02:00.0 PCI bridge: Intel Corporation 6700PXH PCI Express-to-PCI Bridge A (rev 0
9)
02:00.2 PCI bridge: Intel Corporation 6700PXH PCI Express-to-PCI Bridge B (rev 0
9)
03:01.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5704 Gigabit Ethe
rnet (rev 10)
03:01.1 Ethernet controller: Broadcom Corporation NetXtreme BCM5704 Gigabit Ethe
rnet (rev 10)
04:03.0 RAID bus controller: Compaq Computer Corporation Smart Array 64xx (rev 0
1)
05:00.0 PCI bridge: Intel Corporation 6700PXH PCI Express-to-PCI Bridge A (rev 0
9)
05:00.2 PCI bridge: Intel Corporation 6700PXH PCI Express-to-PCI Bridge B (rev 0
9)
0a:01.0 PCI bridge: IBM PCI-X to PCI-X Bridge (rev 03)
0b:04.0 RAID bus controller: Compaq Computer Corporation Smart Array 64xx (rev 0
1)
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