I'm having a similar situation on an Acer Aspire One AO110 netbook. This
system has Intel mobile graphics, not ATI - is there another bug filed
for non-ATI?

lspci reports my graphics as:

00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME,
943/940GML Express Integrated Graphics Controller (rev 03)

I don't know whether my Lucid install is using an open driver for this,
or whether a restricted driver is available. Or maybe it's not the
graphics subsystem at all.

The temperature sits at 56 C even when idle in "Powersave" mode. (I
confirmed I'm in powersave mode via "cat
/sys/devices/system/cpu/cpu0/cpu_freq/scaling_governor" ... the
frequency is generally 800MHz not the max 1.6GHz, but even at half speed
the temp doesn't drop.) An identical machine running Windows XP stays in
the low 40's when idle. I'll be happy to provide more information if
desired.

-- 
[ATI Graphics][Lucid] laptop runs hot, shorter battery life, fan always on
https://bugs.launchpad.net/bugs/563156
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