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SubjectRe: [2.6.39] drm/i915: blank screen on Lenovo Ideapad U160
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Jesse Barnes <jbarnes@virtuousgeek.org> writes:

> On Mon, 13 Jun 2011 23:21:12 +0200
> Dirk Gouders <gouders@et.bocholt.fh-gelsenkirchen.de> wrote:
>
>> Dirk Gouders <gouders@et.bocholt.fh-gelsenkirchen.de> writes:
>>
>> > Dirk Gouders <gouders@et.bocholt.fh-gelsenkirchen.de> writes:
>> >
>> >> "Robert P. J. Day" <rpjday@crashcourse.ca> writes:
>> >>
>> >>> On Tue, 31 May 2011, Dirk Gouders wrote:
>> >>>
>> >>>> Hello,
>> >>>>
>> >>>> I tested 3.0.0-rc1 on my notebook which has never been the best friend
>> >>>> of the i915 driver. With linux-2.6.38-gentoo-r4 it has the problem
>> >>>> that the screen remains blank after the lid is closed and reopened, but
>> >>>> that problem I can live with. With 3.0.0-r1 I am back to a former
>> >>>> problem that the screen goes (and remains) blank while booting.
>> >>>>
>> >>>> The next step I will do is to test linux-2.6.39-gentoo, probably I
>> >>>> did not notice information that I have to adjust boot parameters or the
>> >>>> kernel config?
>> >>>
>> >>> based on my having lived through the i915 "black screen of death",
>> >>> pulling out my handy "git bisect" and with advice from chris wilson,
>> >>> these days, i simply apply this patch to the source:
>> >>>
>> >>> diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
>> >>> index d2c7104..a1a5d03 100644
>> >>> --- a/drivers/gpu/drm/i915/intel_opregion.c
>> >>> +++ b/drivers/gpu/drm/i915/intel_opregion.c
>> >>> @@ -152,6 +152,8 @@ static u32 asle_set_backlight(struct drm_device *dev, u32 bclp)
>> >>> struct opregion_asle *asle = dev_priv->opregion.asle;
>> >>> u32 max;
>> >>>
>> >>> +return ASLE_BACKLIGHT_FAILED; // rday
>> >>> +
>> >>> if (!(bclp & ASLE_BCLP_VALID))
>> >>> return ASLE_BACKLIGHT_FAILED;
>> >>>
>> >>>
>> >>> i tried taking it out a couple of times and immediately got the same
>> >>> i915-related problem so until i hear differently, the patch stays in.
>> >>
>> >> Thanks for the hint. I tested the patch with 3.0.0-rc1 and
>> >> unfortunately the symptoms remain the same.
>> >>
>> >> Meanwhile, I tested 2.6.39-gentoo as well and it also causes that
>> >> problem. So, this is not really a (new) 3.0.0-rc1 issue.
>> >>
>> >> Best regards,
>> >>
>> >> Dirk
>> >
>> > Your patch reminded me of another patch of Chris that caused problems
>> > for several other people, but manually applied to the changed context in
>> > 3.0.0-rc1 again works for me:
>> >
>> > --- linux-3.0-rc1/drivers/gpu/drm/i915/intel_bios.c 2011-05-30 02:43:36.000000000 +0200
>> > +++ /usr/src/linux-3.0-rc1/drivers/gpu/drm/i915/intel_bios.c 2011-05-31 20:53:35.000000000 +0200
>> > @@ -267,7 +267,7 @@
>> > case 4:
>> > return alternate ? 100 : 96;
>> > default:
>> > - return alternate ? 100 : 120;
>> > + return alternate ? 120 : 100;
>> > }
>> > }
>> >
>> > The strange thing is that I am pretty sure that I did not have to modify
>> > 2.6.28-gentoo{,-r4} what I at that time also reported here:
>> > https://bugs.freedesktop.org/show_bug.cgi?id=31596
>>
>> For completeness I want to report that I did a bisect and found out that
>> the following commit seems to be the one that reintroduced the problem
>> that I have to manually patch the kernel to avoid a blank screen
>> (with backlight turned on) during boot:
>>
>> 47a05eca72991039e788b25232061f9c9df9ec23 is the first bad commit
>> commit 47a05eca72991039e788b25232061f9c9df9ec23
>> Author: Jesse Barnes <jbarnes@virtuousgeek.org>
>> Date: Mon Feb 7 13:46:40 2011 -0800
>>
>> drm/i915: disable PCH ports if needed when disabling a CRTC
>>
>> Disable any PCH ports associated with a pipe when disabling it. This
>> should prevent transcoder disable failures due to ports still being on.
>>
>> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
>> [ickle: introduce *_PIPE_ENABLED() macro]
>> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
>>
>> :040000 040000 2c7c54cceb89821941943614cede86c4a2c2a8bc 9382527ee169beb54a10eb0afe8a69d418025c2e M drivers
>
> Just to confirm, does this patch also keep your screen enabled?
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_d
> index 81a9059..ef41487 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -1366,7 +1366,7 @@ static void intel_disable_pch_ports(struct drm_i915_privat
> val = I915_READ(reg);
> if (ADPA_PIPE_ENABLED(val, pipe))
> I915_WRITE(reg, val & ~ADPA_DAC_ENABLE);
> -
> +#if 0
> reg = PCH_LVDS;
> val = I915_READ(reg);
> if (LVDS_PIPE_ENABLED(val, pipe)) {
> @@ -1374,7 +1374,7 @@ static void intel_disable_pch_ports(struct drm_i915_privat
> POSTING_READ(reg);
> udelay(100);
> }
> -
> +#endif
> disable_pch_hdmi(dev_priv, pipe, HDMIB);
> disable_pch_hdmi(dev_priv, pipe, HDMIC);
> disable_pch_hdmi(dev_priv, pipe, HDMID);

No, that patch does not help.

Yesterday, I reverted the following part of the above commit which
completely leaves out the call to intel_disable_pch_ports() and that
helped, but I'm afraid that is not very useful information:

@@ -2864,14 +2900,12 @@ static void ironlake_crtc_disable(struct drm_crtc *crtc)

ironlake_fdi_disable(crtc);

- if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS)) {
- temp = I915_READ(PCH_LVDS);
- if (temp & LVDS_PORT_EN) {
- I915_WRITE(PCH_LVDS, temp & ~LVDS_PORT_EN);
- POSTING_READ(PCH_LVDS);
- udelay(100);
- }
- }
+ /* This is a horrible layering violation; we should be doing this in
+ * the connector/encoder ->prepare instead, but we don't always have
+ * enough information there about the config to know whether it will
+ * actually be necessary or just cause undesired flicker.
+ */
+ intel_disable_pch_ports(dev_priv, pipe);

intel_disable_transcoder(dev_priv, pipe);


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