Public bug reported:
On an up-to-date Hardy install, when I enable the FGLRX driver using the
restricted drivers manager and reboot, either X or FGLRX cause an
excessive number of hardware interrupts on my system whenever it's the
active console:
[EMAIL PROTECTED]:~$ vmstat 1
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
4 0 0 572108 10032 227532 0 0 155 30 22797 126 95 3 1 1
1 0 0 572100 10032 227532 0 0 0 0 2 81 100 0 0 0
1 0 0 572100 10032 227532 0 0 0 0 24 146 100 0 0 0
1 0 0 572100 10040 227532 0 0 0 16 7 92 100 0 0 0
1 0 0 572100 10040 227532 0 0 0 0 25 145 100 0 0 0
1 0 0 572100 10040 227532 0 0 0 0 55805 247 98 2 0 0
2 0 0 572100 10040 227532 0 0 0 0 152106 90 100 0 0 0
3 0 0 572100 10040 227532 0 0 0 0 147587 122 100 0 0 0
1 0 0 572100 10040 227532 0 0 0 0 151499 176 99 1 0 0
1 0 0 572100 10040 227532 0 0 0 0 152357 25 100 0 0 0
1 0 0 572100 10040 227532 0 0 0 0 152022 81 100 0 0 0
1 0 0 572100 10052 227532 0 0 0 40 152170 107 100 0 0 0
1 0 0 572100 10052 227532 0 0 0 0 80430 199 100 0 0 0
1 0 0 572100 10052 227532 0 0 0 0 1 79 100 0 0 0
1 0 0 572100 10052 227532 0 0 0 0 24 131 100 0 0 0
1 0 0 572100 10052 227532 0 0 0 0 1 77 100 0 0 0
Around second 6, I switched from tty1 to tty7 (X server), and back to
tty1 around second 13.
You can see the number of hardware interrupts jump from around 100/s to
150000/s whenever X is on the active console. Performance is also very
noticeably degraded. I've compared this against another system with a
slightly older, but still respectable 3D card and the "in" field never
exceeds 1000. This system.
The VESA driver doesn't experience this problem, but has other
significant issues (like the color map gets all messed up when you
switch to a text console and back).
I've tried various options (noapic, pci=routeirq, irqpoll and others)
without any improvement to the situation and with some the system locks
up hard and needs to be hard-reset.
I've also seen the same problem with this exact same system using Gutsy
and Envy-installed FGLRX drivers.
** Affects: linux-restricted-modules-2.6.24 (Ubuntu)
Importance: Undecided
Status: New
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Using fglrx causes excessive hardware interrupts and an extremely slow system
https://bugs.launchpad.net/bugs/206337
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