It's fixed in 3.5rc4. And I patched my 3.4 kernel with the commit of keith. The problem was gone afterwards as well. Kind regards, Georg On Thu, Jun 28, 2012 at 8:23 PM, Giacomo Comes <comes at naic.edu> wrote: > On Thu, Jun 28, 2012 at 07:52:18AM +0200, Takashi Iwai wrote: >> At Tue, 26 Jun 2012 15:08:32 -0400, >> Giacomo Comes wrote: >> > >> > I have a dell latitude E6420 with Sandybridge Mobile (GT2). >> > Since I got it (about one year ago), it has been a nightmare to run linux on it. >> > At the beginning I installed openSUSE 11.4 (kernel 2.6.37.6) and the laptop >> > would freeze almost immediately. After that I waited for newer kernels in order to >> > see if things would improve. They did improve indeed and finally with kernel 3.0 >> > I was able to run linux (openSUSE 11.4) without laptop freeze or screen issue. >> > Unfortunately, the only kernel that works with my laptop is 3.0. Newer kernel >> > (3.1, 3.2, 3.3 and 3.4) do not work. >> > This is what happen if I run kernel 2.6.39, 3.1, 3.2, 3.3 and 3.4: >> > The laptop boot and does the boot process fine. At the end of the boot process X >> > starts and here the problem appears (about 50% of the times): >> > the screen goes black on the left side (about 2/3 of the whole screen) with white >> > stripes to the right side (the remaining 1/3). >> > The laptop is not dead: I can remotely login or I can perform a clean shutdown >> > if I press the power button, but the screen is totally dead. >> > Another strange issue is that after a bad boot (with the black screen) at the >> > next reboot the screen will start to flicker. The flickering will last some time >> > and it will become less intense as the time goes until it will disappear completely. >> > The funny thing is that the intensity of flicker depends on how long I keep the >> > black screen. If, after the boot process, the black screen appears and I reboot >> > the laptop immediately, then the flicked is moderate and it disappear after >> > 1 or 2 minutes. If I keep the black screen for 1 minute or more, then after the >> > reboot the flicker is very intense and it takes much more to fade. >> >> This reminds me of a similar bug I've seen on HP laptops with HD+ >> (1600x900) monitors. ?Could you check whether the patch below helps? >> >> Note that it just avoids entering to the wrong mode. ?If your laptop >> already starts flickering, at first recover from the flickering state, >> apply the patch, and reboot/test. >> >> >> Takashi >> >> --- >> diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c >> index 08eb04c..3f61bba 100644 >> --- a/drivers/gpu/drm/i915/intel_lvds.c >> +++ b/drivers/gpu/drm/i915/intel_lvds.c >> @@ -413,7 +413,7 @@ static void intel_lvds_prepare(struct drm_encoder *encoder) >> ? ? ? ?* the panel fitter. However at all other times we can just reset >> ? ? ? ?* the registers regardless. >> ? ? ? ?*/ >> - ? ? if (!HAS_PCH_SPLIT(encoder->dev) && intel_lvds->pfit_dirty) >> + ? ? /*if (!HAS_PCH_SPLIT(encoder->dev) && intel_lvds->pfit_dirty)*/ >> ? ? ? ? ? ? ? intel_lvds_disable(intel_lvds); >> ?} >> > > This patch seems to fix the problem. I will regularly run a kernel with > this patch and report if I see any other issue. > > Giacomo > _______________________________________________ > Intel-gfx mailing list > Intel-gfx at lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
