Re: I915: OOPSes on linux-3.14-rc7

[Peter Senna Tschudin]

On Fri, Mar 21, 2014 at 4:11 PM, Daniel Vetter <daniel@xxxxxxxx> wrote:
> On Fri, Mar 21, 2014 at 12:26:51PM +0100, Peter Senna Tschudin wrote:
>> On Thu, Mar 20, 2014 at 10:17 PM, Daniel Vetter <daniel@xxxxxxxx> wrote:
>> > On Thu, Mar 20, 2014 at 05:56:20PM +0100, Peter Senna Tschudin wrote:
>> >> When Fedora updated the Kernel package from 3.12 to 3.13 my notebook
>> >> stopped booting (Kernel freezes) when a 2560 x 1440 high res monitor
>> >> is attached. I have tried using 3.13.6 from kernel.org and the problem
>> >> persists. The problem can be partially solved by passing nomodeset to
>> >> Kernel which will make the Kernel to boot, but the screens never comes
>> >> to life. When using 3.14-rc7 it boots again, the screen works, but
>> >> with some oops messages.
>> >>
>> >> How can I help fixing this issue?
>> >>
>> >> I've reported te bug at:
>> >> https://bugzilla.redhat.com/show_bug.cgi?id=1072557
>> >
>> > For the oops message (well it's just a WARNING, a real oops would kill
>> > your driver for real) please file a bug report on bugs.freedesktop.org
>> > against dri -> drm (intel).
>> >
>> > The information we need is the full dmesg fore the entire boot when
>> > enabling drm.debug=0xe on the kernel cmdline.
>> It is attached.
>>
>> >
>> > For the boot hang you've reported on the redhat bz if you want to move it
>> > forward I suggest to do a reverse bisect betwen 3.13 and 3.14-rc7 to
>> > figure out which bug _fixed_ your problem and then tell me that. I'll
>> > submit it for backporting to stable kernels. Google should find you some
>> > nice howtos for reverse bisecting kerneels.
>> Thank you. I'll do that.
>
> It's an issue with our fastboot clock readout code. Please apply the below
> patch and add an updated dmesg (again with drm.debug=0xe) to your bug
> report.

The dmesg file is attached. Should I open a bug report at
bugs.freedesktop.org for this warning issue?


> -Daniel
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 7be5984431bb..3c0f8f095a6b 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -450,6 +450,8 @@ static void i9xx_clock(int refclk, intel_clock_t *clock)
>  {
>         clock->m = i9xx_dpll_compute_m(clock);
>         clock->p = clock->p1 * clock->p2;
> +       printk("p1 = %u, p2 = %u, n = %u\n", clock->p1, clock->p2,
> +              clock->n);
>         if (WARN_ON(clock->n + 2 == 0 || clock->p == 0))
>                 return;
>         clock->vco = DIV_ROUND_CLOSEST(refclk * clock->m, clock->n + 2);
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> +41 (0) 79 365 57 48 - http://blog.ffwll.ch



-- 
Peter

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