Bug#814279: Suspend/resume brightness issue Debian 8 with i965 integrated video controller

From	Salvatore Bonaccorso <carnil@debian.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#814279: Suspend/resume brightness issue Debian 8 with i965 integrated video controller
Date	2016-04-10 11:40 +0200
Message-ID	<rmk0x-2TM-3@gated-at.bofh.it> (permalink)
References	<r0oDV-1LZ-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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Source: linux
Source-Version: 3.16.7-ckt25-1

Hi,

On Tue, Feb 09, 2016 at 11:00:15PM +0100, r wrote:
> Package: kernel
> Version: 3.16.7-ckt20-1+deb8 amd64
> 
> The issue is related to the suspend/resume brightness with i965 integrated video
> controller. I am able to hibernate and resume but I'm not able to resume from 
> suspend. When I try to suspend both from GUI than from terminal (pm-suspend or
> systemctl suspend) I get only a black screen on resume. The computer works but 
> it seems that the brightness is set to zero and I can not turn the screen on. 
> If I try to hibernate, on resume all works well. I try to switch from tt1 to tt6 
> but nothing changes, the screen remain black. I also tried to use the brightness 
> key but nothing happens.
> 
> I discovered the bug was not present in the previous debian
> stable kernel 3.2 but is still present in the 4.2 and 4.3 kernel from
> backports. I compiled my own 4.4 kernel and now all seems to work.
> 
> I run debian on a macbook 13". 
> 
> This is the C shared lib:
> -----
> :~$ dpkg -l libc6
> libc6:amd64  2.19-18+deb8u2 amd64
> -----
> 
> This is my graphic card:
> -----
> :~$ lspci | grep VGA
> 00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 
> Integrated Graphics Controller (primary) (rev 03)
> -----
> 
> This is dmesg after system resumed:
[...]

So this looks like https://bugs.freedesktop.org/show_bug.cgi?id=88325
and fixed in Linus tree
https://git.kernel.org//linus/1b9448b071caa7d10bb2569fabe3020a2c25ae59
(v4.4-rc2) and backported in 3.16.7-ckt22 as
cb7b74a708c5cd9cdf29b820f340f790d73ae217.

Thanks for confirming it is fixed in v3.16.7-ckt25, closing the
bugreport.

Regards,
Salvatore

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Bug#814279: Suspend/resume brightness issue Debian 8 with i965 integrated video controller Salvatore Bonaccorso <carnil@debian.org> - 2016-04-10 11:40 +0200

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