[Intel-gfx] Fedora 16, kernel 3.2.0+, i5 2500K, Z68 system freeze

CC ccomren at gmail.com
Wed Jan 25 13:34:40 CET 2012

On Wed, Jan 25, 2012 at 1:28 PM, CC <ccomren at gmail.com> wrote:
> On Wed, Jan 25, 2012 at 12:47 PM, Graeme Russ <graeme.russ at gmail.com> wrote:
>> On 01/25/2012 10:31 PM, Chris Wilson wrote:
>>> On Wed, 25 Jan 2012 12:29:05 +1100, Graeme Russ <graeme.russ at gmail.com> wrote:
>>>> Hi All,
>>>> I've been hunting around for information on how to help debug the issue
>>>> I'm having - Hopefully someone here can help
>>>> My setup is:
>>>>  - ASRock Z68 Pro3 Gen3 motherboard
>>>>  - i5 2500K CPU
>>>>  - Fedora 16
>>>>  - Vanilla 3.2.0+ kernel (commt ccb19d263fd1c9e34948e2158c53eacbff369344)
>>> We've had a second report for ASRock Z68 Pro3,
>>> https://bugs.freedesktop.org/show_bug.cgi?id=44992. There he mentions that
>>> setting the iGPU voltage to fixed (1.25V) rather than auto in the BIOS
>>> fixes the system hangs.
>> The MB is a ASRock Z68 Pro3-M, mine is a ASRock Z68 Pro3 Gen3
>> Also see https://bugzilla.kernel.org/show_bug.cgi?id=42597
>> <quote>
>> I've recently had a problem with an AsRock mainboard. As it turned out,
>> their voltage control of the integrated GPU was buggy. Setting the voltage
>> to "fixed 1.5V" instead of "auto" resolved the issue.
>> </quote>
>> I think this is the same person
>> I don't know about the ASRock Z68 Pro3-M, but the Gen3 has a EUFI BIOS and
>> I cannot find an explicit GPU voltage setting. My options are:
>> CPU Core Voltage Offset -100mV - +500mV
>> IGPU Voltage Offset -100mV - +500mV
>> DRAM Voltage 1.201V - 1.8V
>> PCH Voltage 0.780V - 1.646V
>> CPU PLL Voltage 1.548V - 2.310V
>> VTT Voltage 0.768V - 1.634V
>> VCCSA Voltage 0.925V - 1.200V
>> I have already update to the latest BIOS (1.20)
> Of course, the Z68 Pro3-M also has an UEFI BIOS. I can select "auto",
> "offset mode" and "fixed mode" for all voltages. Selecting "fixed
> mode" lets you set the GPU voltage in absolute terms, i.e., 1.25V.
> Best,  CC

I had a look at the manual of the Z68 Pro3 Gen3. While the UEFI setup
seems to be virtually identical, the description for the iGPU voltage
only mentions voltage offset. How about setting the offset to 0V?
Presumably, the offset is about 1.25V anyway.

Best,  CC

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