So this bug is on a VAIO/VPCS11G7E, bugs 640154 and bug 646215 are both on
VPCB11CGX and Bug 653591 is on
an Aspire 5820TG - all look like the same thing to me (646215 is 32bit but
gives the same line from the ips_adjust+0x293 it has)
comes out as intel_ipc.c line 553 for me:
c00: ff 53 70 callq *0x70(%rbx)
c03: 84 c0 test %al,%al
c05: eb 01 jmp c08 <ips_adjust+0x348>
c07: 90 nop
c08: 0f 85 12 ff ff ff jne b20 <ips_adjust+0x260>
if (!ips->gpu_lower())
ips->gpu_turbo_enabled = false;
so is gpu_lower NULL somehow?
I can see in the boot on this machine is the message:
[ 11.358121] intel ips 0000:00:1f.6: failed to get i915 symbols,
graphics turbo disabled
which is the message that gets printed just after gpu_turbo_enabled is set to
false; so I guess something must
be setting gpu_turbo_enabled = true later? Maybe update_turbo_limits or
ips_irq_handler which look like they set it possibly from bios/hardware without
taking account if it had got dropped due to symbols earlier?
Dave
--
ips-adjust - BUG: unable to handle kernel NULL pointer dereference at (null)
https://bugs.launchpad.net/bugs/632430
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