Summary: | [965gm regression] Backlight control broken on Dell XPS M1330 w/ kernel >= 3.14.1 | ||||||||||||
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Product: | DRI | Reporter: | Mikkel Oscar Lyderik <mikkeloscar> | ||||||||||
Component: | DRM/Intel | Assignee: | Antti Koskipaa <antti.koskipaa> | ||||||||||
Status: | CLOSED FIXED | QA Contact: | Intel GFX Bugs mailing list <intel-gfx-bugs> | ||||||||||
Severity: | normal | ||||||||||||
Priority: | highest | CC: | intel-gfx-bugs | ||||||||||
Version: | XOrg git | ||||||||||||
Hardware: | x86-64 (AMD64) | ||||||||||||
OS: | Linux (All) | ||||||||||||
Whiteboard: | |||||||||||||
i915 platform: | i915 features: | ||||||||||||
Attachments: |
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Description
Mikkel Oscar Lyderik
2014-05-13 09:52:56 UTC
Created attachment 98966 [details]
i915_opregion
I finally got some time to do a bit of debugging. Applying this hack: https://bugs.freedesktop.org/show_bug.cgi?id=76276#c15 and only this (to 3.15-rc6) solves the problem for me. (In reply to comment #2) > I finally got some time to do a bit of debugging. > > Applying this hack: https://bugs.freedesktop.org/show_bug.cgi?id=76276#c15 > and only this (to 3.15-rc6) solves the problem for me. And backlight control works with that? What do you have in /sys/class/backlight? The VBT says we should register backlight for that, but then it doesn't work. Hmm. (In reply to comment #3) > (In reply to comment #2) > > I finally got some time to do a bit of debugging. > > > > Applying this hack: https://bugs.freedesktop.org/show_bug.cgi?id=76276#c15 > > and only this (to 3.15-rc6) solves the problem for me. > > And backlight control works with that? What do you have in > /sys/class/backlight? > > The VBT says we should register backlight for that, but then it doesn't > work. Hmm. Yeah I don't have intel_backlight there. with kernel 3.15-rc6 and the hack applied I have: $ ls -l /sys/class/backlight/ total 0 lrwxrwxrwx 1 root root 0 May 27 16:42 acpi_video0 -> ../../devices/pci0000:00/0000:00:02.0/backlight/acpi_video0 With kernel 3.13.8 (before regression) I have: $ ls -l total 0 lrwxrwxrwx 1 root root 0 May 27 16:44 acpi_video0 -> ../../devices/pci0000:00/0000:00:02.0/backlight/acpi_video0 lrwxrwxrwx 1 root root 0 May 27 16:44 intel_backlight -> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight Backlight control (Fn+ArrowUp/Down) works on both of those setups, but it breaks when the 3.15-rc6+hack kernel is suspended and woken up again. Do you need any other infomation? Please attach intel_reg_dumper output for the working and non-working kernels, with no hacks applied and no workarounds (echo or backlight change) done. Intel_reg_dumper is part of intel-gpu-tools: http://cgit.freedesktop.org/xorg/app/intel-gpu-tools/ Created attachment 99960 [details]
intel_reg_dumper for kernel 3.13.8
Created attachment 99961 [details]
intel_reg_dumper for kernel 3.15.0-rc7
I have been running 3.13.8 for the past two months and haven't tested any later kernels other than what I did back in May. I now updated to 3.16.1 and this bug has clearly been resolved at some point. Thanks! Issue still exists , tested in relese 14 ,on 11/11/15 (In reply to Jaya from comment #9) > Issue still exists , tested in relese 14 ,on 11/11/15 No idea what "relese 14" might refer to. Clearly the original reporter here had an issue that was fixed along the way, so let's keep this one closed. Please file a new bug for your issue. |
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