Bug 70386

Summary: invert_brightness needed for HP Envy 17 with Haswell processor
Product: DRI Reporter: Fred New <fred.new2911>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED NOTABUG QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium CC: intel-gfx-bugs
Version: XOrg git   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
dmesg
none
/sys/kernel/debug/dri/0/i915_opregion none

Description Fred New 2013-10-11 18:15:02 UTC 
My display boots black unless I add i915.invert_brightness=1 to my boot parameters (Fedora 20 beta).

# lspci -v -s 00:02.0
00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06) (prog-if 00 [VGA controller])
	Subsystem: Hewlett-Packard Company Device 1968
	Flags: bus master, fast devsel, latency 0, IRQ 43
	Memory at d3000000 (64-bit, non-prefetchable) [size=4M]
	Memory at c0000000 (64-bit, prefetchable) [size=256M]
	I/O ports at 6000 [size=64]
	Expansion ROM at <unassigned> [disabled]
	Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
	Capabilities: [d0] Power Management version 2
	Capabilities: [a4] PCI Advanced Features
	Kernel driver in use: i915

The backlight hotkeys appear to work as I would expect them, except that I don't press the fn key to activate them, I just press F2 (darker) and F3 (brighter).

I'll submit dmesg and /sys/kernel/debug/dri/0/i915_opregion as soon as I can reboot.
Comment 1 Fred New 2013-10-11 18:21:58 UTC 
Created attachment 87476 [details]
dmesg
Comment 2 Fred New 2013-10-11 18:28:11 UTC 
Created attachment 87477 [details]
/sys/kernel/debug/dri/0/i915_opregion
Comment 3 Fred New 2013-10-11 18:33:27 UTC 
For that second attachment, I was unable to mount debugfs because /sys/kernel/debug was already busy. I just attached the file that was already at /sys/kernel/debug/dri/0/i915_opregion.
Comment 4 Fred New 2013-10-11 18:42:15 UTC 
Hmm. Wait a minute. Now the system is booting normally without the invert_brightness parm. Investigating further...
Comment 5 Fred New 2013-10-11 19:25:39 UTC 
Okay, it looks like I just needed to use the hotkeys one time to get a visible screen after boot. The screen brightness gets remembered between boots and it was remembering a black screen until now. The system is working normally now - no invert_brightness needed. (This is really embarrassing.)

Please close this bug.
Comment 6 Daniel Vetter 2013-10-11 20:54:26 UTC 
No problem ;-)

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