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List:       linux-kernel
Subject:    Re: Linux 3.11-rc2
From:       Martin Steigerwald <Martin () lichtvoll ! de>
Date:       2013-07-22 13:15:38
Message-ID: 3298830.Snx2ykMFY6 () merkaba
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Am Montag, 22. Juli 2013, 15:02:22 schrieb Rafael J. Wysocki:
> On Monday, July 22, 2013 12:08:40 AM James Hogan wrote:
> > On 21 July 2013 20:53, Linus Torvalds <torvalds@linux-foundation.org> 
wrote:
> > >  (b) we had a late change to how ACPI backlight handling is done on
> > > 
> > > certain machines, and while this kind of thing really shouldn't be
> > > done outside the merge window, I ended up pulling it anyway. But I'd
> > > *really* like to have people test this thing particularly on laptops
> > > with intel-based graphics. It should only matter (and hopefully
> > > improve things) for the newer ones with BIOSes designed for Windows 8,
> > > but hey, the more testing, the better. Backlight handling has beenin
> > > painful before, so I'm mentioning this explicitly.
> > 
> > 8c5bd7a "ACPI / video / i915: No ACPI backlight if firmware expects
> > Windows 8" breaks backlight control for me because
> > /sys/class/backlight/acpi_video0 disappears, and
> > /sys/class/backlight/intel_backlight doesn't seem to have any effect.
> > 
> > Note that acpi_video0 only worked because I was applying "[PATCH]
> > drm/i915: quirk no PCH_PWM_ENABLE for Dell XPS13 backlight" [1], so
> > strictly speaking mainline already didn't work.
> 
> James, sorry for breaking things for you.  The patch you're mentioning is
> going to hit the mainline at one point anyway I suppose.

Dunno whether thats related, but after locking screen today and screen blanker 
kicking in (just a blank screen), I was not able to reactivate the display 
again by typing a key or so unless I closed the laptop display lid, let the 
machine suspend (to ram) and opened it again.

Plain 3.11-rc2 on ThinkPad T520:

martin@merkaba:~> phoronix-test-suite system-info

Phoronix Test Suite v4.6.0
System Information

Hardware:
Processor: Intel Core i5-2520M @ 3.20GHz (4 Cores), Motherboard: LENOVO 
42433WG, Chipset: Intel 2nd Generation Core Family DRAM, Memory: 8192MB, Disk: 
300GB INTEL SSDSA2CW30 + 30GB INTEL SSDMCEAC03, Graphics: Intel 2nd Generation 
Core Family IGP, Audio: Conexant CX20590, Network: Intel 82579LM Gigabit 
Connection + Intel Centrino Advanced-N 6205

Software:
OS: Debian unstable, Kernel: 3.11.0-rc2-tp520 (x86_64), Desktop: KDE 4.10.5, 
Display Server: X Server 1.12.4, Display Driver: intel 2.20.14, OpenGL: 3.0 
Mesa 9.1.4, Compiler: GCC 4.8, File-System: btrfs, Screen Resolution: 
1920x1080

Thanks,
-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7
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