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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