Re: [Intel-gfx] [PATCH for stable 3.14 only 1/1] drm/i915: restore QUIRK_NO_PCH_PWM_ENABLE

[Romain Francoise]

Jani Nikula  writes:

> This reverts the bisected regressing

> commit bc0bb9fd1c7810407ab810d204bbaecb255fddde
> Author: Jani Nikula 
> Date:   Thu Nov 14 12:14:29 2013 +0200

> drm/i915: remove QUIRK_NO_PCH_PWM_ENABLE

> restoring QUIRK_NO_PCH_PWM_ENABLE for a couple of Dell XPS models which
> broke in 3.14.

I've been running with this revert since v3.14-rc (and now v3.14.2), so:

Tested-by: Romain Francoise 
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Re: [Intel-gfx] v3.14-rc7: Backlight control broken on Dell XPS13

[Romain Francoise]

Jani Nikula  writes:

> Here's two patches to try, separately, *without* the quirk: [...]

Okay, I've tried both and neither works. However, I've noticed that
while the backlight level never changes even though I'm changing it with
Fn+F4/Fn+F5, it *does* get registered somewhere because if I bring it
all the day down and reboot, the brightness is reduced in the next BIOS
POST (loading i915 gets it back to 100%).

Thanks,
-r
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Re: [Intel-gfx] v3.14-rc7: Backlight control broken on Dell XPS13

[Romain Francoise]

Jani Nikula  writes:

> Please file a new bug on DRM/Intel component at [1]. Please attach
> intel_reg_dumper output (tool from intel-gpu-tools [2]) with and without
> the revert. Please also attach dmesg with drm.debug=0xe from early
> boot.

Done, https://bugs.freedesktop.org/show_bug.cgi?id=76276

Let me know if you need more info.

> Do you have the snb or ivb model?

IVB.

> The register dump from *before* i915 gets loaded is also interesting.

That's more difficult to procure, is it really necessary?

Thanks,
-r
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Re: [Intel-gfx] v3.14-rc7: Backlight control broken on Dell XPS13

[Romain Francoise]

Hi Daniel,

Daniel Vetter  writes:

> Please never just send a mail to maintainers, always cc mailing lists.

Yes, sorry, I sent this privately because it wasn't a fully-formed bug
report; I just wanted Jani to confirm that it wasn't intentionally
broken as of -rc7.

> Have you tested with the patch reverted to confirm that it's indeed
> this commit and not something else (e.g. in the acpi code)?

I hadn't, but I've now reverted the revert and things work again as in
v3.13. So as far as I can tell the quirk is still definitely needed.

Thanks!
-r
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