Bug 1394015

Summary:	kernel-4.8 breaks setting brightness on intel video (regression)
Product:	[Fedora] Fedora	Reporter:	Stuart D Gathman <stuart>
Component:	kernel	Assignee:	Kernel Maintainer List <kernel-maint>
Status:	CLOSED DUPLICATE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	unspecified
Version:	24	CC:	gansalmon, ichavero, itamar, jonathan, kernel-maint, lyude, madhu.chinakonda, mchehab
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Hardware:	x86_64
OS:	Linux
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Last Closed:	2017-01-04 21:12:06 UTC	Type:	Bug
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Description Stuart D Gathman 2016-11-10 20:17:31 UTC

Description of problem:
kernel-4.8 freezes xorg for 10 secs when pressing increase brightness key.  

Version-Release number of selected component (if applicable):
kernel-4.8.6-201.fc24.x86_64

How reproducible:
always

Steps to Reproduce:
1. press increase brightness key (dell inspiron 1525 laptop)
2.
3.

Actual results:
screen, keyboard, mouse freeze for 10 secs

Expected results:
increase brightness

Additional info:
kernel-4.8.4 totally froze screen, keyboard, mouse at boot time, including text consoles, making the laptop unusable.  Network was still active.  Kernel 4.7 and earlier do not have this problem, although they do get a similar kernel-oops as reported in bz#134755.  Refer to that bug for the kernel oops from this more serious manifestation.  It is tainted, but only by the kernel oops at boot time, which is also logged there.

Comment 1 Stuart D Gathman 2016-11-10 20:18:10 UTC

Errata, that is bz#1342755

Comment 2 Stuart D Gathman 2016-11-10 21:01:32 UTC

I been reporting this problem for many generations of Fedora, but an earlier report for f24 is bz#1352023.  I won't mark this a dup since the new symptoms are much more serious.

Comment 3 Stuart D Gathman 2016-11-10 21:06:56 UTC

The KVM (kbd,vid,mouse) also freezes when the display dims to save power.

Comment 4 Stuart D Gathman 2016-12-25 14:47:25 UTC

This seems to happen on older Intel graphics.  A desktop with newer Intel graphics does not have this problem.  Here is the hardware kernel-4.8 fails on:

00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (primary) (rev 0c)
00:02.1 Display controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (secondary) (rev 0c)

if this can't be fixed, maybe Fedora should just officially no longer support older Intel graphics.

Comment 5 Stuart D Gathman 2016-12-25 15:00:16 UTC

Still broken on kernel-4.8.15-200.fc24.x86_64, last usable kernel tested was 4.7.9.

Comment 6 Lyude 2017-01-04 21:12:06 UTC


*** This bug has been marked as a duplicate of bug 1342755 ***