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
