Bug 36823

Summary: Firmware Bug: ACPI No _BCQ method
Product: xorg Reporter: Cedric Sodhi <manday>
Component: Driver/RadeonAssignee: xf86-video-ati maintainers <xorg-driver-ati>
Status: NEW --- QA Contact: Xorg Project Team <xorg-team>
Severity: normal    
Priority: medium    
Version: unspecified   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
dmesg
none
possible fix none

Description Cedric Sodhi 2011-05-03 23:51:45 UTC
Radeon Device aa68 Graphics card (Cedar). Used in hybrid graphics with Intel i915 vgaswitcheroo, hence both are compiled in (Bug #36783 [1]) and KMS enabled (without KMS the problem usually not occurs). On boot, the screen tunrs of the backlight by itsself and has to be turned on manually[2]. A message in dmesg that is likely to be related says

Firmware Bug: ACPI: No _BCQ method

THe log has several errors related to the radeon. Kernel is 39-rc5.

[1] https://bugs.freedesktop.org/show_bug.cgi?id=36783
[2] http://forums.gentoo.org/viewtopic-t-874961.html
Comment 1 Cedric Sodhi 2011-05-03 23:54:59 UTC
Created attachment 46307 [details]
dmesg
Comment 2 Alex Deucher 2011-05-05 22:38:58 UTC
Created attachment 46384 [details] [review]
possible fix

Does this kernel patch help?
Comment 3 Cedric Sodhi 2011-05-06 11:06:27 UTC
(In reply to comment #2)
> Created an attachment (id=46384) [details]
> possible fix
> 
> Does this kernel patch help?

No (tried on next-20110506).
Comment 4 Alex Deucher 2011-10-05 06:23:17 UTC
This looks like a duplicate of bug 41306.
Comment 5 Cedric Sodhi 2011-10-05 10:45:16 UTC
(In reply to comment #4)
> This looks like a duplicate of bug 41306.

Negative. It is related in thus far as that this problem (as I've mentioned in Bug #41306) constitutes the part where the backlight initially goes off. However, it's is not assumed, nor it is likely, that it is directly related to the problem that the backlight cannot be brought back on (which is, what the other bug concerns).

Prior to the 3 series there have been times when the backlight would go off (with the error mentioned above) but could be brought back on nonetheless.

As also mentioned in the other bug, these scenarios could, however, not be reproduced for unknown reasons.

After all this bug should stay open and a priori assumed to be uncorrelated.

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